JPH09200215A - Asynchronous data transfer system - Google Patents

Abstract

It is an object of the present invention to improve the utilization efficiency of a synchronous time division LAN in a local area network for an asynchronous data transfer method regardless of fluctuations in call volume. In a communication network in which a plurality of interface nodes (100) each accommodating an ATM communication device (300) for asynchronously transmitting and receiving ATM cells (ACL) are connected in a loop by a synchronous time division transmission line (200) ,
In each interface node (100), various means (101, for adding a LAN transfer cell header (LHD) to a LAN transfer cell (LCL) to be sent to the synchronous time division transmission line.
103, 105, 107, 109, 10B, 10D, 1
0F, 10H, 10J) and synchronous time division transmission line (2)
Various means (102, 104, 106, 10) for analyzing the LAN transfer cell header part of the LAN transfer cell arriving from
8, 10A, 10C, 10E, 10G, 10I, 10
K) is provided to improve the transfer efficiency and reliability of ATM cells via the synchronous time division LAN.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous data transfer system in a local area network, and in particular, a plurality of interface nodes accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells are looped by a synchronous time division transmission line. The present invention relates to an asynchronous data transfer method in a local area network (hereinafter abbreviated as LAN) to be connected.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an example of a synchronous time division LAN which is the subject of the present invention, FIG. 7 is a diagram showing an example of the time division frame in FIG. 6, and FIG. 8 is a transmission / reception cell in FIG. It is a figure which illustrates.

The synchronous time division LAN shown in FIG. 6 is formed by connecting a plurality of interface nodes (IN) (1) in a ring by a synchronous time division transmission line (2). An ATM communication device (ASR) (3) is housed in each interface node (IN) (1).

The synchronous time division transmission line (2) is composed of a pair of transmission lines whose communication directions are opposite to each other. One of them is used as a working system and the other is used as a standby system, so that the working system cannot communicate. In this case, the standby system is switched to the active system and communication is continued.

In the synchronous time division transmission line (2), the time division frame (F) as shown in FIG. 7 is transmitted in a constant cycle [for example, 125 microsecond cycle], and each time division frame (F) is transmitted. F) is an interface node (IN) (1
₁ ) It is composed of multiple time slots (TS) used for mutual information transfer. In addition, time division frame (F)
In parallel with this, a frame header (FH) indicating the _first time slot (TS ₁ ) of the time division frame (F) is transmitted.

Each time slot (TS) is composed of 8 bits, and each time slot (TS) has a transmission rate of 64 kilobits per second.
On the other hand, the ATM cell (ACL) that each ATM communication device (ASR) (3) transmits / receives to / from the interface node (IN) (1) accommodated therein is, as is well known, 5
It is assumed that it has a 53-byte format consisting of a byte cell header and a 48-byte payload, but the transmission / reception timing is asynchronous as shown in FIG. 7, and when an ATM cell (ACL) is not transmitted / received. Is transferred in a time area called an empty cell (I).

In a conventional synchronous LAN, each AT
The M communication device (ASR) (3) circulates on the synchronous time division transmission line (2) for transmitting and receiving ATM cells (ACL) to and from each other via the synchronous LAN. Each time slot (TS) in the
Each ATM communication device (ASR) (3) by fixedly distributing for communication between the communication devices (ASR) (3)
Each of the interface nodes (IN) (1) is connected to each other in a net-like manner by a direct communication path and accommodates each A
Each of the ATM communication devices (ASR) (3) holds a transmission time slot (TS) and a reception time slot (TS) for each communication partner assigned to the TM communication device (ASR) (3). Each ATM communication device (ASR)
The number of direct communication paths allocated for communication with (3) is held.

Each ATM communication device (ASR) (3) uses a transmission ATM cell (ACL) addressed to each ATM communication device (ASR) (3) for transmission to the ATM communication device (ASR) (3). Transfer to the accommodated interface node (IN) (1) via the assigned direct communication path, and the interface node (IN) (1) is transferred from the accommodated ATM communication device (ASR) (3). The ATM cell (ACL) addressed to each ATM communication device (ASR) (3) is transmitted to the communication path (2) in synchronization with the allocated time slot (TS) for transmission.

Each interface node (IN)
(1) is a reception time slot (TS) assigned to the accommodating ATM communication device (ASR) (3),
The ATM cell (ACL) arriving from the communication path (2) is received and transferred to the accommodating ATM communication device (ASR) (3).

However, each ATM communication device (ASR) (3)
Since the ATM cell (ACL) transmitted from the ATM cell is asynchronous as shown in FIG. 7, each ATM communication device (ASR)
(3) The direct communication channel [time slot (TS) on the synchronous time division transmission channel (2)] assigned to each other is not always used effectively, and each ATM communication device (AS)
R) (3) Since it is difficult to quickly change the distribution of the direct communication path even when the amount of communication between them fluctuates,
The utilization efficiency of the synchronous time division transmission line (2) may be further reduced.

[0011]

As is clear from the above description, in the conventional synchronous time division LAN, the time division frame (F) which circulates around the synchronous time division transmission line (2).
Each time slot (TS) of each ATM communication device (A
SR) (3) are assigned to the direct communication paths that connect them to each other so that the ATM communication devices (ASR) (3) are connected to each other in a mesh form, and ATM cells (ACL) are connected via the direct communication paths. Are transmitted asynchronously, the direct communication channel [on the synchronous time division transmission line (2), the time slot (T
S)] is not always used effectively, and particularly when the communication amount between the ATM communication devices (ASR) (3) varies, the utilization efficiency of the synchronous time division LAN further decreases. I was afraid to do it.

It is an object of the present invention to improve the utilization efficiency of the synchronous time division LAN regardless of fluctuations in call volume.

[0013]

FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, 100 is an interface node,
Reference numeral 200 is a synchronous time division transmission line, and 300 is an ATM communication device.

The interface node (100) is an AT
It accommodates an ATM communication device (300) that asynchronously transmits and receives M cells (ACL). Synchronous time division transmission line (200)
Connects a plurality of interface nodes (100) in a ring to form a communication network.

Reference numeral 101 is a valid information adding means provided in the interface node (100) according to the present invention (claim 1). 102 is an effective cell identifying means provided in the interface node (100) according to the present invention (claim 1).

Reference numeral 103 is an erasing information adding means provided in the interface node (100) according to the present invention (claim 2). Reference numeral 104 is a deletion information identifying means provided in the interface node (100) according to the present invention (claim 2).

Reference numeral 105 is passage information adding means provided in the interface node (100) according to the present invention (claim 3). Reference numeral 106 is a transit node number counting means provided in the interface node (100) according to the present invention (claim 3).

Reference numeral 107 denotes a broadcast reception adding means provided in the interface node (100) according to the present invention (claim 4). Reference numeral 108 denotes broadcast reception confirmation means provided in the interface node (100) according to the present invention (claim 4).

Reference numeral 109 is a continuous information setting means provided in the interface node (100) according to the present invention (claim 5). 10A is a continuous sequence control means provided in the interface node (100) according to the present invention (claim 5).

10B is a destination address adding means provided in the interface node (100) according to the present invention (claim 6). 10C is a destination address analysis means provided in the interface node (100) according to the present invention (claim 6).

Reference numeral 10D is a source address adding means provided in the interface node (100) according to the present invention (claim 8). 10E is a source address analyzing means provided in the interface node (100) according to the present invention (claim 8).

Reference numeral 10F is a node state adding means provided in the interface node (100) according to the present invention (claim 10). 10G is a node state analyzing means provided in the interface node (100) according to the present invention (claim 10).

Reference numeral 10H is a relay standby setting means provided in the interface node (100) according to the present invention (claim 11). 10I is a relay standby control means provided in the interface node (100) according to the present invention (claim 11).

Reference numeral 10J is inspection information adding means provided in the interface node (100) according to the present invention (claim 12). Reference numeral 10K is the inspection information determining means provided in the interface node (100) according to the present invention (claim 12).

The valid information adding means (101) is the belonging AT
ATM cell (AC) transmitted from the M communication device (300)
L), the virtual path identifier (VPI) and the virtual channel identifier (VCI) are analyzed to determine the validity of the ATM cell (ACL), and the valid cell information (AV) indicating the determination result is added. A LAN transfer cell (LCL) is formed and sent to the synchronous time division transmission line (200).

The valid cell identifying means (102) is a LAN transfer cell (L) arriving from the synchronous time division transmission line (200).
When CL) is received, the valid cell information (AV) added to the LAN transfer cell (LCL) is analyzed, and if the valid cell information (AV) indicates that it is valid, the LAN
The transfer cell (LCL) reception process is executed, and the LAN transfer cell (LCL) is transferred to its own interface node (100).
After receiving at another interface node (100)
When the cell is discarded without being transferred to the LAN, the valid cell information (AV) provided in the LAN transfer cell (LCL) is set to the invalid state, and the LAN transfer indicating that the valid cell information (AV) is invalid It is determined that the cell (LCL) can be used for transmission of a new valid LAN transfer cell (LCL).

The erasure information adding means (103) is a belonging AT
ATM cell (AC) transmitted from the M communication device (300)
The virtual path identifier (VPI) and the virtual channel identifier (VCI) added to L) are analyzed and, based on the analysis result, the ATM cell (ACL) is discarded after being received by the destination interface node (100), or After being received by the interface node (100), it is returned to the originating interface node (100), and the originating interface node (100) receives the destination interface node (10).
After confirming the reception end by 0), it is judged whether to be discarded,
The erase format information (BP) indicating the determination result is added to the ATM cell (ACL) to form a LAN transfer cell (LCL), and the LAN transfer cell (LCL) is sent to the synchronous time division transmission line (200).

The erasure information identifying means (104) is a LAN transfer cell (L) arriving from the synchronous time division transmission line (200).
When CL) is received, the erasing format information (BP) added to the LAN transfer cell (LCL) is analyzed, and when the erasing format information (BP) specifies erasing at the destination interface node (100), , When the receiving interface node (100) of the LAN transfer cell (LCL) executes the receiving process and then discards it, and when the erasing format information (BP) specifies erasing at the originating interface node (100), the LAN transfer is performed. After performing the receiving process in the destination interface node (100) of the cell (LCL), it is returned to the originating interface node (100) without being discarded, and in the originating interface node (100) of the LAN forwarding cell (LCL) the LAN forwarding cell ( Discard processing after confirming that reception processing has been completed at the destination interface node (100) of LCL) To run.

The passage information adding means (105) is a LAN transfer cell (L) arriving from the synchronous time division transmission line (200).
When CL) is transferred to another interface node (100), passing number information (LIFE) indicating that it has passed through its own interface node (100) is added to the LAN transfer cell (LCL) and another interface node (LCL) is added. 1
00).

The transit node number counting means (106), when receiving the LAN transfer cell (LCL) arriving from the synchronous time division transmission line (200), transfers the LAN transfer cell (LC).
The number-of-passage information (LIFE) added to L) is analyzed to identify the number of pass interface nodes (100) of the LAN transfer cell (LCL).

The broadcast reception adding means (107) is a LAN transfer cell (L) arriving from the synchronous time division transmission line (200).
When CL) is received, the LAN transfer cell (LCL) is for broadcast communication, and its own interface node (10
When 0) is designated as one of the broadcast destinations, the broadcast reception information (MKF) indicating that the reception processing of the own interface node (100) is completed is added to the LAN transfer cell (LCL) and the other interface is added. Transfer to node (100).

When the LAN transfer cell (LCL) circulates within the synchronous time division transmission line (200) and is returned to the source interface node (100), the broadcast reception confirmation means (108) returns the LAN transfer cell (100). The broadcast reception information (MKF) added to (LCL) is analyzed, and the LAN transfer cell (L
The reception end of the broadcast destination interface node (100) of CL) is confirmed.

The continuous information setting means (109) is the belonging AT
A plurality of ATMs sequentially transmitted from the M communication device (300)
As a result of analyzing the virtual path identifier (VPI) and the virtual channel identifier (VCI) of the cell (ACL), if it is determined that the ATM cell (ACL) is transferred to the same interface node (100), the sequence indicating the sequence is shown. The cell information (PTR) is added to each continuous ATM cell (ACL) to form a LAN transfer cell (LCL), which is sent to the synchronous time division transmission line (200).

The continuous sequence control means (10A) is a LAN transfer cell (L) that arrives from the synchronous time division transmission line (200).
When CL) is received, the continuous cell information (PTR) added to the LAN transfer cell (LCL) is analyzed, and the reception order is controlled in the order indicated by the continuous cell information (PTR).

The destination address adding means (10B) is assigned to the affiliation A
ATM cells (A transmitted from the TM communication device (300)
The virtual path identifier (VPI) and virtual channel identifier (VCI) added to CL) are analyzed, the destination interface node (100) of the ATM cell (ACL) is identified, and the identified destination interface node (100) is designated. The destination address is added to form a LAN transfer cell (LCL), and the LAN transfer cell (LCL) is sent to the synchronous time division transmission line (200).

The destination address analysis means (10C) receives the LAN transfer cell (LCL) arriving from the synchronous time division transmission line (200), and then receives the LAN transfer cell (LC).
The destination address added to L) is analyzed, and the destination interface node (100) of the LAN transfer cell (LCL) is analyzed.
Are identified without analyzing the virtual path identifier (VPI) and virtual channel identifier (VCI) of the ATM cell (ACL) forming the LAN transfer cell (LCL).

The destination address analysis means (10C) extracts the destination address added to the LAN transfer cell (LCL) arriving from the synchronous time division transmission line (200) and stores it as statistical data. It is considered that the communication amount of the LAN transfer cell (LCL) arriving at each node (100) via the synchronous time division transmission line (200) can be analyzed.

The originating address adding means (10D) is assigned to the affiliation A
ATM cells (A transmitted from the TM communication device (300)
An address for identifying its own interface node (100) is added to CL as a source address to form a LAN transfer cell (LCL), which is sent to the synchronous time division transmission line (200).

The source address analysis means (10E) receives the LAN transfer cell (LCL) arriving from the synchronous time division transmission line (200), and then the LAN transfer cell (LC).
L) The source address added to L) is analyzed, and the source interface node (100) of the LAN transfer cell (LCL) is analyzed.
Are identified without analyzing the virtual path identifier (VPI) and virtual channel identifier (VCI) of the ATM cell (ACL) forming the LAN transfer cell (LCL).

The source address analysis means (10E) extracts the source address added to the LAN transfer cell (LCL) arriving from the synchronous time division transmission line (200) and stores it as statistical data. Each node (100)
From the LAN to the synchronous time division transmission line (200)
It is considered to be able to analyze the traffic of the transfer cell (LCL).

The node state adding means (10F) receives the LAN transfer cell (LCL) arriving from the synchronous time division transmission line (200), and then receives the LAN transfer cell (LC).
L) is for broadcast communication, the own interface node (100) is designated as one of the broadcast destinations, and LA
When the N transfer cells (LCL) cannot be received, the destination node status information (RST) indicating that the own interface node (100) cannot receive the LAN transfer cells (LCL) is transmitted to the LAN. It is added to the transfer cell (LCL) and transferred to another interface node (100).

The node state analysis means (10G) is a LAN
When the transfer cell (LCL) circulates in the synchronous time division transmission line (200) and is returned to the source interface node (100), the destination node status information (RST) added to the LAN transfer cell (LCL) is transmitted. ) Is analyzed, and the broadcast destination interface node (100) of the LAN transfer cell (LCL) is analyzed.
Determine the reception status of.

The relay standby setting means (10H) is a LAN transfer cell (L) arriving from the synchronous time division transmission line (200).
When the LAN transfer cell (LCL) is transferred to another interface node (100) when CL) is received,
LA sent from the local interface node (100)
When the N transfer cells (LCL) are made to wait until the transmission is completed, buffer information (BF) indicating that they are made to wait when relaying the own interface node (100) is added to the LAN transfer cells (LCL). Transfer to another interface node (100).

The relay standby control means (10I) is a LAN transfer cell (L) arriving from the synchronous time division transmission line (200).
The buffer information (BF) added to CL) is analyzed, and when the buffer information (BF) indicates that relay waiting has already been completed, the LAN transfer cell (LCL) is relay-transferred to another interface node (100). At this time, the LAN transfer cell (L
CL) is given priority over relay transfer.

The inspection information adding means (10J) is an AT belonging to
ATM cell (AC) transmitted from the M communication device (300)
LAN transfer cell (LC
LAN transfer cell (LCL) when L) is formed and inserted in the time division frame (F) and sent to the communication path (200).
The inspection information that can detect all the information errors that compose the above is added based on a predetermined error inspection rule.

When the inspection information judging means (10K) receives the LAN transfer cell (LCL) included in the time division frame (F) arriving from the communication path (200), the LA is transmitted to the LA.
Using the inspection information added to the N transfer cells (LCL), the presence or absence of an error is inspected based on a predetermined inspection rule.

Therefore, each interface node transfers only valid ATM cells through an arbitrary free time division area of the synchronous time division transmission line, and is addressed to the own interface node from the LAN transfer cell arriving from the synchronous time division transmission line. In addition, since each interface node can collect various information that can grasp the communication state of the synchronous time-division LAN, the utilization efficiency of the synchronous time-division LAN is significantly improved.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 2 is a diagram showing an interface node according to an embodiment of the present invention, and FIG. 3 is an AT in FIG.
5 is a diagram illustrating an M interface block, FIG. 4 is a diagram illustrating a cell information analysis unit in FIG. 2, and FIG.
FIG. 3 is a diagram showing a LAN transfer cell format according to an embodiment of the present invention. The same reference numerals indicate the same objects throughout the drawings. The target synchronous time division LAN is as shown in FIGS. 6 to 8.

2 to 5, the valid information adding means (101) and the valid cell identifying means (1) shown in FIG.
02), the valid cell identification unit (112) is provided in the ATM interface block (11), the valid cell identification unit (182) is provided in the cell information analysis unit (18), and the erase information in FIG. As the adding means (103) and the erasing information identifying means (104), the erasing format determining section (113) is in the ATM interface block (11), and the erasing format determining section (183) is in the cell information analyzing section (18). The passing information adding means (105) and the passing node number counting means (1) shown in FIG.
06), the passing node number counting unit (184) is provided in the cell information analysis unit (18), and as the broadcast reception addition means (107) and the broadcast reception confirmation means (108) in FIG. The broadcast destination number identification unit (114) is an ATM
It is provided in the interface block (11), the broadcast destination information adding section (185) is provided in the cell information analyzing section (18), and the continuous information setting means (109) and continuous sequence control in FIG. As means (10A),
The continuous cell identification unit (115) is provided in the ATM interface block (11), the continuous cell reception control unit (186) is provided in the cell information analysis unit (18), and the destination address addition in FIG. As the means (10B) and the destination address analyzing means (10C), the destination address identifying unit (116) is an ATM interface block (1).
1) and the destination address analysis unit (187) is provided in the cell information analysis unit (18).
As the calling address addition means (10D) and the calling address analysis means (10E) in
7) is provided in the ATM interface block (11), the source address analysis unit (188) is provided in the cell information analysis unit (18), and the node state addition means (10F) and node in FIG. As the state analysis means (10G), a node state setting part (189) is provided in the cell information analysis part (18), and as the relay standby setting means (10H) and the relay standby control means (10I) in FIG. , A buffer information setting unit (18A) is provided in the cell information analysis unit (18), and FIG.
The cell check unit (181) is provided in the cell information analysis unit (18) as the inspection information addition unit (10J) and the inspection information determination unit (10K) in the above.

Also in the embodiment of the present invention, an ATM cell (ACL) is provided between each ATM communication device (ASR) (3) and the accommodated interface node (IN) (1) in the situation shown in FIG. A time division frame (F) as shown in FIG. 7 is transferred in a synchronous manner to a synchronous time division transmission line (2) which is being transmitted and received and which connects the interface nodes (IN) (1) in a ring shape. ing.

2 to 8, the interface
(IN) (1₁) ATM interface block
Ku (11₁) Is an ATM communication device (ASR) to be housed
(3₁) Receive ATM cells (ACL)
Then, the transmission cell analysis unit (111 ₁) To identify the virtual path
Extract child (VPI) and virtual channel identifier (VCI)
The valid cell identification unit (112₁), Erasure type determination unit
(113₁), The broadcast destination number identification unit (114₁), Continuous cell
Identification section (115₁) And the destination address identification unit (11
6₁).

The valid cell identification unit (112 ₁ ) is provided with the virtual path identifier (V ₁ ) transmitted from the transmission cell analysis unit (111 ₁ ).
PI) and virtual channel identifier (VCI),
It is determined whether or not the received ATM cell (ACL) is a valid cell (U), and when it is determined as a valid cell (U),
The valid cell information (AV) is set to the valid state [for example, logic "1"]
When it is determined that the cell is an empty cell (I), the valid cell information (AV) is set to an invalid state (for example, a logical “0”), and the cell multiplexing section (12 ₁ ) is notified of the transmission. The cell analysis unit (111 ₁ ) is instructed to transfer the ATM cell (ACL) to the cell multiplexing unit (12 ₁ ).

Further, the erasing format judging section (113 ₁ ) analyzes the virtual path identifier (VPI) and virtual channel identifier (VCI) transmitted from the transmission cell analyzing section (111 ₁ ) and receives the ATM cell (ACL). Is for single communication to a single destination or for broadcast communication to multiple destinations,
When it is determined that it is for single communication, the erasing format information (BP) is set to the reception erasing format [for example, logical "0"], and when it is determined that it is for broadcast communication, the erasing format information (BP) is transmitted and erased. It is set to a format [for example, logical "1"] and transmitted to the cell multiplexer (12 ₁ ).

The broadcast destination number identification unit (114 ₁ ) analyzes the virtual path identifier (VPI) and virtual channel identifier (VCI) transmitted from the transmission cell analysis unit (111 ₁ ) and receives the ATM cell ( If the ACL) is for single communication or for broadcast communication, and if it is for single communication, the broadcast reception information (MKF) is set to an invalid state [for example, logic "0"], and the broadcast communication is performed. If it is determined that the broadcast reception information (MKF) is equal to the number of broadcast communication destinations,
It is transmitted to the cell multiplexing unit (12 ₁ ).

The continuous cell identification unit (115 ₁ ) analyzes the virtual path identifier (VPI) and virtual channel identifier (VCI) transmitted from the transmission cell analysis unit (111 ₁ ) and receives the ATM cell (ACL). Received AT last time
Same ATM communication device (ASR) as M cell (ACL)
If it is determined that the ATM cells (ACL) addressed to the same ATM communication device (ASR) (3) are continuous, the continuous cell information (PTR) is set to ATM.
The order of cells (ACL) is set as shown and transmitted to the cell multiplexer (12 ₁ ).

The same ATM communication device (ASR) (3)
When the addressed ATM cells (ACL) are not continuous, the continuous cell information (PTR) is initialized to "1". In addition, the destination address identification unit (116 ₁ ) is a transmission cell analysis unit (11 ₁ ).
1 ₁ ) analyzes the virtual path identifier (VPI) and virtual channel identifier (VCI) transmitted from the AT, and receives the AT
Destination interface node (IN) of M cell (ACL)
(1) and the ATM communication device (ASR) (3) are identified, and the destination node address (DNA) indicating the destination interface node (IN) (1) and the destination port address indicating the destination ATM communication device (ASR) (3) (DPA) and transmits to the cell multiplexer (12 ₁ ).

Further, the calling address determination unit (117₁) Is my
Interface node (IN) (1 ₁) Was given to
The source address (NA) as the source node address (SNA)
Also, the source ATM communication device of the ATM cell (ACL)
(ASR) (3₁) Port address (P
A) is used as the source port address (SPA) and the cell multiplexer
(12₁) To.

[0058] cell multiplexing section (12 _1), when transmitting the valid cell information (AV = logic "1") and ATM cell (ACL) from the ATM interface block (11 _1), ATM interface block (11 ₁₎ It is determined that the valid cell (U) is transmitted from the ATM interface block (11 ₁ ) and the ATM cell (AC) transmitted from the ATM interface block (11 ₁ ).
L) is added with a LAN transfer cell header section (LHD) as shown in FIG. 5, and the valid cell information (AV = logical “1”) transmitted from the valid cell identifying section (112 ₁ ) and the erasing format determining section ( 113 ₁ ) the erase format information (B
P), the broadcast reception information (MKF) corresponding to the number of broadcast reception information transmitted from the broadcast destination number identification unit (114 ₁ ), and the continuous cell information (PT transmitted from the continuous cell identification unit (115 ₁ ).
R), the destination node address (DNA) and the destination port address (D) transmitted from the destination address identification unit (116 ₁ ).
PA), the source node address (SNA) and the source port address (SPA) transmitted from the source address determination unit (117 ₁ ) are respectively set in predetermined positions, and the remaining passing vehicle number information (LIFE), buffer information (BF) and The destination node status information (RST) is initially set [eg, logical "0"].
Set to.

Subsequently, the cell multiplexer (12 ₁ ) is connected to the LAN transfer cell header (LHD) and ATM cell (ACL).
A cell check sequence (CCK) is generated based on a predetermined check rule (eg, odd parity check rule) for all information included in the LAN transfer cell header section (LH).
D) and the ATM cell (ACL) are added as a LAN transfer cell check unit (LCK).

As described above, the LAN transfer cell (LCL) as shown in FIG. 5 is formed. Also, the cell multiplexing unit (12
₁₎ determines the only valid cell information from the ATM interface block (11 ₁₎ (AV = logic "0") is transmitted, an empty cell from the ATM interface block (11 ₁₎ (I) is transmitted, LAN transfer cell (L
CL) is not formed.

The cell multiplexer (12 ₁ ) is formed by the formed LA.
The N transfer cell (LCL) is transmitted from another ATM interface block (11 ₁ ) (not shown) to form the L transfer cell (LCL).
After time-division multiplexing with the AN transfer cell (LCL) and storing in the transmission buffer unit (13 ₁ ), the cell information management unit (1A
₁ ) Request transmission of a LAN transfer cell (LCL).

When the cell information management section (1A ₁ ) receives the transmission request for the LAN transfer cell (LCL) from the cell multiplexing section (12 ₁ ), the other interface node (IN) (1)
₄ ) arrives via the synchronous time division transmission line (2),
The empty / occluded state of the time division frame (F) as shown in FIG. 7 which is transmitted to the synchronous time division transmission line (2) together with the other LAN transfer cells (LCL) accumulated in the reception buffer unit (16 ₁ ) is analyzed. Then, it is inserted into the LAN transfer cell (LCL) in which the empty state [valid cell information (AV) is invalid (= logical “0”)], and selectors (SEL) (14 ₁ ) and (15 ₁ ) To the synchronous time division transmission line (2) via the.

In the time division frame (F) sent to the synchronous time division transmission line (2), the LAN transfer cell (LCL) in which the valid cell information (AV = logical "1") indicating the valid state is set. ) Is not transferred to the time slot (TS),
A free LAN transfer cell (LCL) in which valid cell information (AV = logical “0”) indicating an invalid state is set is transferred.

The LAN transfer cell (LCL) sent from the interface node (IN) (1 ₁ ) is transferred to the adjacent interface node (IN) (1 ₂ ) via the synchronous time division transmission line (2). To be done.

[0065] interface node (IN) (1 ₂₎ in the cell information analyzer (18 ₂₎ is, LAN transfer cell (LCL) arriving from synchronous time division transmission lines (2)
Is received via the reception buffer unit (16 ₂ ), the cell check unit (181 ₂ ) and the valid cell identification unit (18
2 ₂ ), erasure type determination unit (183 ₂ ), transit node number counting unit (184 ₂ ), broadcast destination information addition unit (185 ₂ ), continuous cell reception control unit (186 ₂ ), destination address analysis unit (1
87 ₂ ), source address analysis unit (188 ₂ ), node state setting unit (189 ₂ ), buffer information setting unit (18A ₂ ).
Also, the ATM cell extraction unit (18B ₂ ) is activated.

The activated cell check unit (181 ₂ )
Performs an error check process on the received LAN transfer cell (LCL) based on a predetermined check rule [odd parity check rule in the previous example]. If no error is detected, the execution results of other units are executed. Is determined to be valid, but if an error is detected, the execution results of other units are determined to be invalid, and
The received LAN transfer cell (LCL) is processed according to a predetermined procedure [discard or transfer to the originating interface node (IN) (1 ₁ )].

Also, the activated valid cell identification section (18
2 ₂ ) is the LAN of the received LAN transfer cell (LCL)
When the valid cell information (AV) set in the transfer cell header (LHD) is extracted and the setting state is analyzed, and the valid cell information (AV) is set in the valid state [= logical “1”], Determines that the received LAN transfer cell (LCL) is valid and activates the cell check unit (181), but when the valid cell information (AV) is set to the invalid state [= logical “0”] Is the received LAN transfer cell (LC
L) is determined to be invalid, the subsequent reception process is not executed, and the selector (SE) is operated according to the instruction of the cell information management unit (1A ₂ ).
L) (14 ₂ ) and (15 ₂ ) to the synchronous time division transmission line (2).

Also, the erase format judgment unit (18
3 ₂ ) is the LAN of the received LAN transfer cell (LCL)
The erasing format information (BP) set in the transfer cell header section (LHD) is analyzed. If the erasing format information (BP = logical “1”) is set, the self interface node (IN) (1 ₂ If the predetermined erasing process is not executed even after the receiving process is completed in), and the receiving erasing format (BP = logical “0”) is set, the self interface node (IN) (1 ₂ ) After the reception process is completed, a predetermined erasing process is executed.

The activated transit node number counting unit (18
4 ₂ ) is the LAN of the received LAN transfer cell (LCL)
The passing vehicle number information (LIFE) set in the transfer cell header portion (LHD) is extracted and saved as statistical data, and "1" is added as the amount passed through the own interface node (IN) (1 ₂ ), It is again stored in a predetermined position of the LAN transfer cell header part (LHD).

Also, the broadcast destination information addition unit (185 that has been activated)
₂ ) analyzes the destination node address (DNA) set in the LAN transfer cell header (LHD) of the received LAN transfer cell (LCL), and determines the destination node address (DN
When A) identifies that it matches the broadcast group address given to the broadcast group including the own interface node (IN) (1 ₂ ), the broadcast reception information secured in the LAN transfer cell header section (LHD) In (MKF), the broadcast reception information (MKF) for confirming the reception processing of its own interface node (IN) (1 ₂ ) is set in a predetermined area.

The activated continuous cell reception control unit (18
6 ₂ ) is the LAN of the received LAN transfer cell (LCL)
The destination node address (DNA) set in the transfer cell header (LHD) is analyzed, and the destination node address (DN)
A) the own interface node (IN) (1 ₂₎ to or coincides with the assigned node address (NA), or the own interface node (IN) (1 ₂₎ multicast group assigned to the broadcast group comprising When it is identified that the address matches the address, the continuous cell information (PTR) set in the LAN transfer cell header (LHD) is extracted, and the destination node address (DTR) is received until the next LAN transfer cell (LCL) is received.
NA) and the destination port address (DPA), and when the continuous cell information (PTR) is other than “1”, the previously received LAN transfer cell (LC)
L) The destination node address (DNA) and destination port address (DPA) are compared, and when they are confirmed to be the same, the consecutive cell information (PTR) held next and the consecutive cell information (PTR) extracted this time , And the continuity with the continuous cell information (PTR) stored is checked, and if continuous, the LAN transfer cell (LC) to the same destination (LC
L) is continuously received, and the ATM communication device (ASR) specified by the destination port address (DPA)
When the transfer processing to (3) is permitted, but the transfer processing is not continuous, after the order of the LAN transfer cell (LCL) received previously and the LAN transfer cell (LCL) received thereafter is corrected, the arrival port is corrected. The transfer processing to the ATM communication device (ASR) (3) designated by the address (DPA) is permitted.

Also, the called address analysis unit (187) which is activated
_Two) Is the LAN transfer of the received LAN transfer cell (LCL).
The destination node address set in the transmission cell header (LHD)
Dress (DNA) and destination address (DPA)
The destination node address (DNA) is extracted and its own interface
Snode (IN) (1_Two) Node add
Responsible (NA) or not, or own interface
Snode (IN) (1 _Two) Included in the broadcast group
Analysis whether it matches with the broadcast group address (NA)
Then, its own interface node (IN) (1_Two)
Registered node address (NA) or own interface
Node (IN) (1_Two) Included in the broadcast group
When a match with the broadcast group address (NA) is detected
In addition, the destination port address (DPA)
Node (IN) (1_Two) ATM communication equipment
Port address assigned to storage (ASR) (3)
(PA) is analyzed to see if it matches, and if a match is detected,
If the interface node (IN) (1)_Two)
ATM communication device (ASR) (3) addressed to the ATM
LAN transfer cell (LCL) including ACL (ACL)
Reception processing to the destination ATM communication device (ASR) (3)
, And own interface node (IN)
(1_Two) Node address (NA) assigned to
Or own interface node (IN) (1_Two) Including
Inconsistency with the broadcast group address (NA) assigned to the broadcast group
When a match is detected, the local interface node (I
N) (1_Two) Does not allow reception processing to
Node (IN) (1_Three) Is allowed.

The destination address analysis unit (187 ₂ ) stores the extracted destination node address (DNA) and destination port address (DPA) as statistical information,
For example, it is possible to analyze the communication volume of the LAN transfer cell (LCL) that arrives at each interface node (IN) (1) via the synchronous time division transmission line (2).

The originating address analysis unit (188 that has been activated)
₂ ) extracts the source node address (SNA) and the source port address (SPA) set in the LAN transfer cell header (LHD) of the received LAN transfer cell (LCL), and saves them as statistical information. For example, a LAN transfer cell (L) transmitted from each interface node (IN) (1) via a synchronous time division transmission line (2).
It is possible to analyze the communication volume of CL).

The activated node state setting unit (189
₂ ) extracts the destination node address (DNA) and destination port address (DPA) set in the LAN transfer cell header part (LHD) of the received LAN transfer cell (LCL), and the destination node address (DNA) is automatically extracted. It is analyzed whether or not it matches with the broadcast group address (NA) given to the broadcast group including the interface node (IN) (1 ₂ ), and if a match is detected, the interface node (IN) itself is detected. LAN transfer cell (LCL) received by (1 ₂ )
If the LAN transfer cell (LCL) is recognized to be in an abnormal state in which it cannot normally receive, the own interface node (IN) (1 ₂ ) The destination node status information (RST) indicating the abnormal state of the LAN transfer cell (LCL) of the received L
It is set at a predetermined position of the AN transfer cell header part (LHD) and the LA received by the broadcast destination information adding part (185 ₂ ).
LAN transfer cell header part (LH) of N transfer cell (LCL)
It is prohibited to set the broadcast reception information (MKF) of its own interface node (IN) (1 ₂ ) in the predetermined area secured in D).

Interface node (IN)
(1_Two) Is disabled, the selector (S
EL) (15_Two) Sets the synchronous time division transmission line (2)
Fixed part (17 _Two) Is set to bypass status
Therefore, LAN transfer that arrives from the synchronous time division transmission line (2)
The cell (LCL) has a state setting unit (17_Two) Via sync
It is transferred to the type time division transmission line (2).

[0077] state setting unit to take (17 _2), LAN transfer cell header (LHD) which is set to be that the destination node address of the LAN transfer cells transferred (LCL) (DNA) and destination port address (DPA) And analyzes whether the destination node address (DNA) matches the broadcast group address (NA) given to the broadcast group including the own interface node (IN) (1 ₂ ),
When a match is detected, the local interface node (I
N) (1 ₂ ) receives the LAN transfer cell (LCL), the LAN transfer cell (LC) which has received the destination node state information (RST) indicating that the LAN transfer cell (LCL) is in an abnormal state in which the LAN transfer cell (LCL) cannot be normally received.
After being set at a predetermined position of the LAN transfer cell header part (LHD) of L), it is sent to the synchronous time division transmission line (2).

Also, the activated buffer information setting section (18
A ₂ ) is the LAN of the received LAN transfer cell (LCL)
The destination node address (DNA) set in the transfer cell header (LHD) is extracted, and the destination node address (DN)
It is necessary to analyze whether there is a need to transfer the LAN transfer cell (LCL) received by A) to another interface node (IN) (1) and transfer it to another interface node (IN) (1). If yes, then LAN
When the buffer information (BF) set in the transfer cell header (LHD) is extracted and the setting state is analyzed and it is determined that the relay standby unset state [= logical “0”] is set, the reception buffer The LAN transfer cell (LCL) currently being stored in the section (16 ₂ ) is the interface node (IN)
LAN transfer cell (LC) sent from another interface node (IN) (1) before reaching (1 ₂ )
It is determined that L) has not been made to stand by by the reception buffer unit (16) in the same interface node (IN) (1), and the cell multiplexing unit (12 ₂ ) causes the LAN transfer cell (LC).
L) is preferentially transmitted to the cell information management unit (1
It is determined that there is no problem even if the received LAN transfer cell (LCL) is made to stand by in the reception buffer unit (16) when it is transmitted from A ₂ ) and the transmission buffer is sent to the cell information management unit (1A ₂ ). Other LANs stored in department (13 ₂ )
The transfer cell (LCL) is allowed to be preferentially transmitted while the transfer of the reception LAN transfer cell (LCL) already stored in the reception buffer unit (16 ₂ ) is made to wait, and the extracted buffer information ( BF) is set to the relay standby setting state [= logical “1”] and set to a predetermined position of the LAN transfer cell header (LHD).

As a result of the analysis, when it is identified that the buffer information (BF) is set to the relay standby setting state [= logical “1”], the LAN transfer cell (16 ₂ ) which is being accumulated in the receiving buffer unit (16 ₂ ). The LCL determines that the reception buffer unit (16) in the other interface node (IN) (1) has made it wait until it arrives at its own interface node (IN) (1 ₂ ). Cell multiplexer (1
If the request to preferentially send the LAN transfer cell (LCL) from the 2 ₂ ) to the synchronous time division transmission line (2) is permitted, the LAN transfer cell (L ₂ ) waiting in the reception buffer unit (16 ₂ )
(CL) transfer delay time is judged to increase more than allowable,
For the cell information management unit (1A ₂ ), the reception buffer unit (1
6 ₂ ) It is instructed to preferentially process the LAN transfer cell (LCL) being accumulated in the transmission.

Further, the activated ATM cell extraction unit (18B
_Two) Is the destination address analysis unit (187 _Two) Is your interface
Base node (IN) (1_Two) ATM communication
Contains ATM cells (ACL) destined for device (ASR) (3)
It is judged as a LAN transfer cell (LCL) and the destination ATM communication device
If the reception process to the storage (ASR) (3) is allowed,
From the received LAN transfer cell (LCL) to ATM cell (A
CL) is extracted and the cell separation unit (1B_Two) And selector
(SEL) (1C_Two) Via ATM interface
Lock (11_Two) To.

The ATM cell extraction unit (18B ₂ ) is
After the reception processing of the TM cell (ACL) is completed, the erasure format judgment unit (183 ₂ ) is notified of that fact, and the erasure format information (BP) is set to the reception erasure format (BP = logical “0”). If so, a predetermined erasing process (for example, valid cell information (AV) is set to an invalid state [set to logic "0" in the previous example)) can be executed.

The destination node address (DNA) and destination port address (DPA) specify the broadcast group address,
Moreover, the LAN transfer cell (LCL) in which the erasure format information (BP) is set to the transmission erasure format [= logical “1”]
Is a source node address (S) via each interface node (IN) (1) and synchronous time division transmission line (2).
Interface node (IN) specified by NA)
Returned to (1 ₁ ).

In the interface node (IN) (1 ₁ ), the cell information analysis unit (18 ₁ ) processes the LAN transfer cell header (LHD) of the received LAN transfer cell (LCL) in each unit in the same process as described above. The passing node number counting unit (184 ₁ ) extracts and analyzes the passing number information (LIFE), confirms the total number of interface nodes (IN) (1) that are operating in the synchronous time division LAN, and detects an error. State, the presence or absence of the interface node (IN) (1) set to the bypass state is inspected, and the broadcast destination information addition unit (185 ₁ ) checks the returned LAN transfer cell (LC).
The broadcast reception information (MKF) set in the LAN transfer cell header part (LHD) of L) is extracted to determine whether or not all the desired broadcast destination interface nodes (IN) (1) have completed reception. Confirm and further node status setting unit (189 ₁ )
Extracts the destination node status information (RST) set in the LAN transfer cell header (LHD) of the returned LAN transfer cell (LCL) and analyzes the status of the unreceivable interface node (IN) (1) To do.

As is clear from the above description, according to the embodiment of the present invention, the ATM cell (ACL) transmitted from the ATM communication device (ASR) (3) is only the valid cell (U) when the synchronous type is used. Since it is transmitted to the division transmission line (2), it is eliminated that the synchronous time division transmission line (2) is occupied by the empty cell (I), and the effective cell (U) is the LAN transfer cell (LCL). ) Is inserted into an arbitrary vacant LAN transfer cell (LCL) on the synchronous time division transmission line (2) and transmitted, so that the vacant LAN transfer cell (LCL) is transmitted on the synchronous time division transmission line (2). As long as it exists, a valid cell (U) can be always transmitted.

Each interface node (IN)
In (1), by storing the valid cell information (AV) of each LAN transfer cell (LCL) as statistical data,
It is possible to grasp the amount of communication transferred in the synchronous time division LAN.

The empty / occluded state of the LAN transfer cell (LCL) transferred on the synchronous time division transmission line (2) is immediately checked by checking the valid cell information (AV) of the LAN transfer cell header section (LHD). Since it can be identified, it is not necessary to analyze the virtual path identifier (VPI) and virtual channel identifier (VCI) of each ATM cell (ACL) one by one as in the conventional synchronous time division LAN, and the LAN transfer cell (LCL) can be identified. The air blockage determination process is significantly speeded up.

Further, the erasing format of the LAN transfer cell (LCL) is designated by erasing format information (BP), and the LA for independent communication is specified.
The N transfer cell (LCL) sets the erasure format information (BP) to the reception erasure format [for example, logical "0"] so that the reception interface node (IN) (1) immediately receives valid cell information (AV) after completion of reception. ) To an invalid state [= logical “0”], its own interface node (IN)
(1) and other interface nodes (IN) (1)
Can be used to transfer the next LAN transfer cell (LCL), and the broadcast LAN transfer cell (LCL) must set the erase format information (BP) to the transmit erase format (for example, logical "1"). As a result, the result of the broadcast communication can be confirmed at the interface node (IN) (1) of the transmission source by using it together with the passing vehicle number information (LIFE) or the broadcast reception information (MKF), and the reliability of the broadcast communication can be improved. improves.

The same interface node (IN)
LAN transfer cell (LCL) continuously transmitted in (1)
By adding continuous cell information (PTR) to, it becomes possible to confirm the order of ATM cells (ACL) that are continuously transferred by the reception interface node (IN) (1),
Correct the reversed reception order, or omit missing ATM cells (A
CL) can also be reliably detected.

Each interface node (IN)
Destination node address (DNA) and source node address (SN) of the LAN transfer cell (LCL) transferred in (1)
Since A) can be collected, the communication amount distribution in the synchronous time division LAN can be grasped for each interface node (IN) (1), and the specific interface node (I)
N) It is possible to prevent the transmission amount and the reception amount from being concentrated in (1).

Further, by adding the buffer information (BF) to the LAN transfer cell (LCL), the specific LAN transfer cell (LCL) can have a plurality of interface nodes (IN).
When relaying (1), the possibility of multiple relay standby is reduced, and it is possible to prevent an increase in transfer delay time in the synchronous time division LAN.

Further, since the LAN transfer cell (LCL) transferred on the synchronous time division transmission line (2) can be checked for errors, the reliability of the transferred ATM cell (ACL) is improved.

It is to be noted that FIGS. 2 to 8 are merely one embodiment of the present invention, and for example, the configuration of a synchronous time division LAN, L
The configurations of the AN transfer cell (LCL) and the LAN transfer cell header section (LHD) are not limited to those shown in the drawing, and many other modifications are considered. In any case, the effect of the present invention is obtained. does not change. Further, the configuration of the interface node (100) which is the object of the present invention is not limited to the one in which all claims are adopted at the same time as shown in the figure, and each claim is individually selected and adopted. Although many other modifications are considered, the effect of the present invention does not change in any case.

[0093]

As described above, according to the present invention, in the synchronous time division LAN, each interface node is enabled
Only TM cells are transferred by an arbitrary free time division area of the synchronous time division transmission line, and the own interface node is extracted from the LAN transfer cells arriving from the synchronous time division transmission line, and each interface node is synchronized. Mold time sharing L
Since it becomes possible to collect various kinds of information that can grasp the communication state of the AN, the utilization efficiency of the synchronous time division LAN is significantly improved.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 illustrates an interface node according to an embodiment of the present invention.

FIG. 3 is an ATM interface block shown in FIG.

FIG. 4 is a cell information analysis unit in FIG.

FIG. 5 shows a LAN transfer cell format according to an embodiment of the present invention.

FIG. 6 is a diagram of a synchronous time division LAN as an object of the present invention.

FIG. 7 is a time division frame in FIG.

8 is a transmission / reception cell in FIG.

[Explanation of symbols]

 1, 100 Interface node (IN) 2, 200 Synchronous time division transmission line 3, 300 ATM communication device (ASR) 11 ATM interface block 12 Cell multiplexing unit 13 Transmission buffer unit 14, 15, 1C selector (SEL) 16 Reception buffer Part 17 State setting part 18 Cell information analysis part 19 Cell monitoring part 1A Cell information management part 1B Cell separation part 101 Effective information addition means 102 Effective cell identification means 103 Erased information addition means 104 Erased information identification means 105 Passed information addition means 106 Pass Node number counting means 107 Broadcast reception addition means 108 Broadcast reception confirmation means 109 Continuous information setting means 10A Continuous sequence control means 10B Destination address addition means 10C Destination address analysis means 10D Source address addition means 10E Source address analysis means 10F Node status Addition unit 10G Node status analysis unit 10H Relay standby setting unit 10I Relay standby control unit 10J Inspection information addition unit 10K Inspection information determination unit 111 Transmitted cell analysis unit 112 Effective cell identification unit 113 Erasable format determination unit 114 Broadcast destination identification unit 115 Continuous cell identification unit 116 Destination address identification unit 117 Source address determination unit 118 Received cell analysis unit 181 Cell check unit 182 Effective cell identification unit 183 Erasing format determination unit 184 Passing node number counting unit 185 Broadcast destination information addition unit 186 Continuous cell reception Control unit 187 Destination address analysis unit 188 Source address analysis unit 189 Node state setting unit 18A Buffer information setting unit 18B ATM cell extraction unit

Claims (12)

[Claims] 1. A communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving an ATM cell are connected in a ring by a synchronous time division transmission line, wherein each interface node belongs to an ATM communication device. The virtual path identifier and virtual channel identifier added to the ATM cell transmitted from the ATM cell are analyzed to determine the validity of the ATM cell, and valid cell information indicating the determination result is added to form a LAN transfer cell. Valid information adding means for sending to the synchronous time division transmission line, and valid cell information added to the LAN transfer cell when the LAN transfer cell arriving from the synchronous time division transmission line is received. When the analysis shows that the valid cell information is valid, the receiving process of the LAN transfer cell is executed, and the LAN transfer cell is received. When the self-interface node receives and discards it without transferring it to another interface node, the valid cell information provided in the LAN transfer cell is set to the invalid state, and the valid cell information is invalid. And an effective cell identifying means for determining that the LAN transfer cell indicating the above can be used for transmission of a new effective LAN transfer cell. 2. A communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving an ATM cell are connected in a loop by a synchronous time division transmission line, wherein each interface node belongs to an ATM communication device. The virtual path identifier and the virtual channel identifier added to the ATM cell transmitted from the ATM cell are analyzed and, based on the analysis result, the ATM cell is discarded after being received by the destination interface node or is generated after being received by the destination interface node. It is returned to the interface node, and it is determined whether or not it is discarded after confirming the reception end by the destination interface node at the source interface node, and the erase format information indicating the determination result is added to the ATM cell to form a LAN transfer cell. Erase information sent to the synchronous time division transmission line When the LAN transfer cell arriving from the synchronous time division transmission line is received, the erasing format information added to the LAN transferring cell is analyzed, and the erasing format information is erased at the destination interface node. When the destination interface node of the LAN transfer cell executes the receiving process and then discards it, and when the erasing format information designates the erasing at the source interface node, the LA
After receiving processing at the destination interface node of the N transfer cell, it is returned to the source interface node without being discarded, and after confirming that the source interface node of the LAN transfer cell has received the destination interface node of the LAN transfer cell. And an erasure information identifying means for executing a discarding process. 3. A communication network in which a plurality of interface nodes, each accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells, are connected in a loop by a synchronous time division transmission line, When the LAN transfer cell arriving from the divided transmission line is transferred to another interface node, passing number information indicating that it has passed through its own interface node is added to the LAN transfer cell and transferred to another interface node When receiving the LAN transfer cell arriving from the synchronous time division transmission line, the information adding means analyzes the number-of-passages added to the LAN transfer cell and analyzes the passing interface node of the LAN transfer cell. Asynchronous data, characterized in that a means for counting the number of passing nodes for identifying the number is provided. Transfer method. 4. A communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells are connected in a ring by a synchronous time division transmission line, When the LAN transfer cell arriving from the divided transmission line is received, the L
When the AN transfer cell is for broadcast communication and the own interface node is designated as one of the broadcast destinations, the broadcast reception information indicating that the reception processing of the own interface node is completed is added to the LAN transfer cell. And a broadcast reception adding means for transferring the data to another interface node, and when the LAN transfer cell circulates in the synchronous time division transmission line and is returned to the source interface node.
Analyze the broadcast reception information added to the AN transfer cell,
An asynchronous data transfer system, comprising: a broadcast reception confirmation means for confirming reception completion of a broadcast destination interface node of the LAN transfer cell. 5. In a communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells are connected in a ring by a synchronous time division transmission line, the ATM communication device belonging to each interface node As a result of analyzing the virtual path identifiers and virtual channel identifiers of a plurality of ATM cells sequentially transmitted from the above, when it is determined that the ATM cells are transferred to the same interface node, continuous cell information indicating the order is added to the continuous cell information. When a LAN transfer cell is formed by adding a LAN transfer cell to each ATM cell and sent to the synchronous time division transmission line, and the LAN transfer cell arriving from the synchronous time division transmission line is received. , The continuous cell information added to the LAN transfer cell is analyzed, and the reception order is controlled in the order indicated by the continuous cell information. Asynchronous data transfer method, characterized by providing a continuous sequence control means for. 6. In a communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells are connected in a loop by a synchronous time division transmission line, the ATM communication device belonging to each interface node The virtual path identifier and virtual channel identifier added to the ATM cell transmitted from the ATM cell are analyzed, the destination interface node of the ATM cell is identified, and the destination address designating the identified destination interface node is added to the LAN transfer cell. And a destination address addition means for transmitting the data to the synchronous time division transmission line, and a destination address added to the LAN transfer cell when the LAN transfer cell arriving from the synchronous time division transmission line is received. The address is analyzed, the destination interface node of the LAN transfer cell is formed, and the LAN transfer cell is formed. Asynchronous data transfer method, characterized by providing an identifying destination address analyzing unit without analyzing the virtual path identifier and virtual channel identifier includes the ATM cells. 7. The synchronous address division means extracts the incoming address added to the LAN transfer cell arriving from the synchronous time division transmission line, and saves it as statistical data. 7. The asynchronous data transfer system according to claim 6, wherein the communication amount of the LAN transfer cell arriving at each of the nodes via a transmission line can be analyzed. 8. A communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving an ATM cell are connected in a loop by a synchronous time division transmission line, wherein each interface node belongs to an ATM communication device. From the ATM cell transmitted from the ATM cell, an address for identifying its own interface node is added as a source address to form a LAN transfer cell, and the source address is added to the synchronous time division transmission line, and the synchronous time division is provided. When the LAN transfer cell arriving from the transmission line is received, the source address added to the LAN transfer cell is analyzed, and the source interface node of the LAN transfer cell is set to the ATM cell forming the LAN transfer cell. Originating address that identifies the provided virtual path identifier and virtual channel identifier without analyzing Asynchronous data transfer method, characterized by providing the analysis means. 9. The source address analysis means extracts the source address added to the LAN transfer cell arriving from the synchronous time division transmission line, and stores the source address as statistical data, so that the source address is analyzed from each node. 9. The asynchronous data transfer system according to claim 8, wherein the communication amount of the LAN transfer cell transmitted to the synchronous time division transmission line can be analyzed. 10. A communication network in which a plurality of interface nodes, each accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells, are connected in a ring by a synchronous time division transmission line, When the LAN transfer cell arriving from the divided transmission line is received,
If the LAN transfer cell is for broadcast communication, the own interface node is designated as one of the broadcast destinations, and the LAN transfer cell cannot be received in an abnormal state, the own interface node The destination node status information indicating that the LAN transfer cell cannot receive the LAN transfer cell.
Node state adding means for adding to the AN transfer cell and transferring to another interface node, and LAN transfer when the LAN transfer cell circulates in the synchronous time division transmission line and is returned to the source interface node An asynchronous data transfer system, comprising: node status analysis means for analyzing destination node status information added to a cell and determining a reception status of a broadcast destination interface node of the LAN transfer cell. 11. In a communication network in which a plurality of interface nodes, each accommodating an ATM communication device for asynchronously transmitting and receiving ATM cells, are connected in a loop by a synchronous time division transmission line, When the LAN transfer cell arriving from the divided transmission line is received,
LAN transmitted from its own interface node when transferring the LAN transfer cell to another interface node
Relay standby setting means for adding buffer information to the LAN transfer cell to indicate that the transfer cell is in a standby state when relaying the own interface node when the transfer cell is kept waiting until the transmission of the transfer cell is completed. Analyzing the buffer information added to the LAN transfer cell arriving from the synchronous time division transmission line, and if the buffer information indicates that relay standby has already been completed, the LAN transfer cell is transferred to another interface node. When transferring by relay,
An asynchronous data transfer system, comprising: a relay standby control means for performing a relay transfer with priority over a LAN transfer cell transmitted from its own interface node. 12. A communication network in which a plurality of interface nodes each accommodating an ATM communication device for asynchronously transmitting and receiving an ATM cell are connected in a ring by a synchronous time division transmission line, wherein each interface node belongs to an ATM communication device. From the ATM cell transmitted from the
When N transfer cells are formed, inserted into the time-division frame and sent out to the communication path, an error of all information constituting the LAN transfer cells can be detected based on a predetermined error check rule. When a LAN transfer cell included in the time division frame arriving from the communication path is received, the inspection information adding unit that adds information, and the inspection information added to the LAN transfer cell is used to determine the predetermined value. And an inspection information determining means for inspecting the presence or absence of an error based on the inspection rule of 1.