JPH03136538A - Multiplex system - Google Patents

Abstract

PURPOSE:To multiplex freely communication information from various terminal equipments whose speed and protocol differ from each other by providing layers 1, 2 of protocol to each of terminal relating processing sections and providing a processing unit processing the layer 3 of the protocol to only one of the terminal relating processing sections in common. CONSTITUTION:A processing unit 140 is provided on a multiplexer 131 among multiplexers 130-132 of 3 stage configuration and the multiplexers are interconnected via routing header conversion circuits 150-152. Each of terminal relating processing sections 111-116 applies the termination processing from the layer 1 to the layer 2 of the protocol and the processing unit 140 applies the termination processing of the layer 3 of the protocol. A virtual path of a multiplex section sending and receiving control information between the terminal relating processing section and the processing unit, between the routing header conversion circuits and the processing unit and between the multiplex control sections 160-162 and the processing unit is set fixedly at the system initialization. The routing is optionally set to the cell for the communication information between the terminal equipments by the terminal relating processing sections, the routing header conversion circuits, and the multiplex control section based on the control information.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multiplexing system for interconnecting a plurality of multiplexing devices.

(Prior Art) As a conventional multiplexing device, a multiplex transmission device shown in FIG. 2(a) is known. This multiplex transmission equipment consists of a Digimol line termination unit DSU installed in a user's home, a station equipment CT installed in an ISM, and a remote equipment RT used to provide services to remote locations. The digital line termination unit DSU consists of a user/network interface section, a line termination section, a transmission line termination section, a multiplex conversion section, an optical transceiver section, and -
Provides a next level velocity interface.

The station device CT has a function of terminating lines for both direct and remote accommodation types and a function of interfacing with a signaling device,
It is composed of a multiplex conversion unit MUX and a common unit COM. The multiplex conversion unit MUX is composed of a subscriber support section, a multiplex conversion section, and a 4MPM interface section, and the subscriber support section includes an in-office line termination board OCU for direct accommodation or a relay transmission line interface board IF for remote accommodation. Implement.

The multiplex conversion unit and 4MPM interface unit multiplex converts the primary rate line from the subscriber support unit and connects it to the signal equipment.
Send out on the M Highway. The common unit COM is composed of a clock supply section and an alarm section.

The remote device RT has a line terminating function for accommodating users near the station, a function for multiplexing multiple user lines, and a terminating function for a relay transmission line, and is composed of a multiplex conversion unit MUX and a common unit COM.

Note that 1 is an optical pulse subscriber line, and 2 is a secondary group relay transmission line.

This multiplex transmission device is a device that repeatedly terminates only layer 1 and simply multiplexes and transmits to the station.

By connecting these multiplex transmission devices in a subordinate manner, it is possible to input 1.5 Mb/s x 4 times, as shown in Figure 2 (a), and the multiplex transmission device accommodates a 1.5 Mb/s line and a 6 Mb/s line. You can also. In this multiplex transmission equipment, layer 2
．． Termination of step 3 is not done. Further, the users of line A and the user of line B accommodated in this multiplex transmission device bring communication information to the subscriber line exchange, and communicate back to the subscriber line exchange.

FIG. 2(b) shows a packet multiplexer used in a packet switch, where TE is a terminal, PMX is a packet multiplexer, and PS is a packet switch. In this device,
, terminates from layer 1 to layer 3 of the 25 protocol,
It is also possible to connect in a subordinate manner, and multiple relay exchanges are performed.

(Problem to be Solved by the Invention) When multiplexing devices are connected in a subordinate manner, a multiplexing device that accommodates few lines or performs only small multiplexing, and a multiplexing device that accommodates many lines or performs high multiplexing, etc. It is clear that flexible connections cannot be achieved by combining multiple transmission devices that perform simple multiplexing of lines as described in the prior art. Further, there are disadvantages in that the lines accommodated in the multiplexer cannot be looped back within the multiplexer, and the lines cannot be extended to multiple output routes of the multiplexer.

On the other hand, the speed that a packet multiplexer can handle is 64K b
/s or less, and has the disadvantage of not being able to freely handle up to several + Mb/s. In addition, since all multiplexers up to level 3 terminate, it is possible to freely connect multiplexers that accommodate only a few lines or multiplexers that perform high multiplexing, but Since the connection delay associated with Layer 3 processing in each multiplexer increases linearly, it affects the connection and transfer delay time of subscribers, and if high-speed transfer is required, Link Bison Since the multiplexing device terminates up to Layer 3 using a network connection, there is a limit to the number of dependent multiplexing devices, and in actual operation, this is often done once.

Currently, no multiplexing system using ATM that is under discussion at CCITT has been proposed other than the multiplexing method mentioned above, and since the ATM user/network interface has a speed of 155 Mb/s, the speed of 155 Mb/s is Also the speed,
A multiplexing method that can freely multiplex communication information from various terminals using different protocols is important, but when conventional multiplexing methods are used, problems remain.

The purpose of the invention is to improve speed, protocols (e.g. l5DN
An object of the present invention is to provide a multiplexing method that allows communication information from various terminals with different protocols to be freely multiplexed.

(Means for Solving the Problem) In order to achieve the above object, claim (1) provides protocol processing, ATV cell processing, decellization processing, and a multiplexing unit for communication information from various terminals having different speeds and protocols. a terminal compatible processing unit that attaches a routing header for routing; and a multiplexing unit that has a plurality of input/output terminals and performs multiplexing and demultiplexing according to the routing header attached to communication information from the terminal compatible processing unit. , and a multiplexing control section that performs multiplexing/demultiplexing control of the multiplexing section, in a multiplexing system that interconnects X multiplexing devices, one multiplexing device among the The multiplexing devices are connected to each other via a routing header conversion circuit, and each terminal processing section performs termination processing from layer 1 to layer 2 of the protocol. , performs layer 3 termination processing of the protocol, and sends and receives control information such as routing information and cell header information between each terminal processing section and the processing device, between the routing header conversion circuit and the processing device, and between the multiplexing control section and the processing device. A virtual route in the multiplexing unit for this purpose is fixedly set at the time of system initialization, and control information is sent and received through the virtual route, while communication information between terminals is determined based on the control information. Claim (2) characterized by a multiplexing system, characterized in that the processing section, the routing header conversion circuit, and the multiplexing control section arbitrarily set the routing to cells, and the multiplexing section performs the routing as desired. In the multiplexing method according to claim (1), the control information is transmitted from the processing device via the multiplexing control section, and from the multiplexing control section to the terminal corresponding processing section,
Routing setting processing is performed on the routing header conversion circuit. In claim (3), in the multiplexing system according to claim (1), each of the other X-1 multiplexers is also provided with a processing device, and the control information is transmitted from one processing device to the other - the other X via one multiplexer;
- Routing setting processing is performed from one multiplexing device to the terminal processing unit and the routing header conversion circuit.

(Function) According to the multiplexing system of the present invention, even if multiple multiplexers are freely connected, only one place processes layers 1 to 3. Even if the packet multiplexing device is increased, the delay time related to connection processing is smaller than that of a conventional packet multiplexing device. In addition, since multiplexing devices can be freely combined, it is also possible to freely connect multiplexing devices that accommodate few lines or perform only small multiplexing, and multiplexing devices that accommodate many lines or perform high multiplexing. It becomes possible. Furthermore, since the position of the multiplexer in which the processing device is housed can be set in advance at the time of system setup, the processing device can be provided in the multiplexer of any stage.

(Embodiment) FIG. 1 shows an example of a configuration in which three stages of multiplexing devices are connected in a subordinate manner. 101, 102.103.104.105
．． 10B are terminals having the same or different communication protocols and communication speeds, such as telephones, data terminal devices, TV conference devices, and computers. 111, 112.113.114.115.11B
130.131.132 is a multiplexing unit that demultiplexes communication information, 160.161, 18 is a terminal processing unit installed to correspond to the terminals 101 to 106, respectively.
2 is a multiplexing control unit, and 140 is a processing device. 150.
151 and 152 are routing header conversion circuits.

The terminal processing units 111 to 116 perform termination processing from layer 1 to layer 2 of the communication information protocol, and the processing device 140 performs call processing of layer 3 of the protocol. In addition, the processing device 140 performs system management and control for instructing routing to the terminal processing units 113 to 114. In this embodiment, the second stage multiplexer 131
Although the processing device 140 is installed in the first and third stage multiplexing devices 130 and 132, it is clear that an equivalent multiplexing system can be realized by placing the processing device in the multiplexing devices 130 and 132 of the first and third stages.

FIG. 3 shows an example of the configuration of a terminal-compatible processing section, which is an interface section with a terminal. For example, the terminal is X.

If the number of packet terminals is 25, layer 1 processing of X and 21 is performed. 200 is a subscriber circuit, and 201 is a circuit that performs zero insertion and deletion of packets and synchronization processing of HDLC frames. A circuit 202 converts the HDLC frame into ATM cells and decells the cells from the multiplexer into the HDLC frame.

On the other hand, 203 is a circuit that performs layer 2 processing such as error control and setting of logical connections in cooperation with the circuit 201. A circuit 204 interfaces with the multiplexing unit and performs cell synchronization and the like. For details on cellization and decellation, please refer to the explanatory article ``Trends in FATM communication technology'' in the Journal of the Institute of Electronics, Information and Communication Engineers (8)
(August 1998), etc., so the explanation will be omitted. For example, in the case of an HDLC frame of data, it is divided into fixed-length packets, and information such as routing information and cell alignment is added to the header of each cell. In addition, if the terminal is a telephone, 2
00 is a subscriber circuit including a codec, circuit 201 is a communication information storage circuit for cell formation, and circuits 203 and 2
04 performs almost the same processing as a packet terminal.

The above explanation is about the case of a terminal operator, but since the function is the same even if multiplexed as a line, the explanation is omitted, but this case is also included in the scope of the present invention.

FIG. 4 shows an example of the configuration of the routing header conversion circuits 150 and 151. For example, the routing information of the multiplexing unit 130 added to the cell header from the multiplexing unit 130 is removed,
This circuit has a function of replacing routing information for routing within the multiplexing unit 131 instructed by the processing device 140. 300 is a line interface circuit, 3
01 is a circuit that separates the information part and the header part of the cell. 302 is a circuit that temporarily stores the information part of the cell; 303 is a circuit that converts the header for routing in the multiplexing unit 131 or 132 according to instructions from the routing processing circuit 306; and 304 is the information part from the circuit 302. and a circuit for synthesizing the ladder part from the routing processing circuit 303; 305 a circuit for separating cells from information to be instructed from the processing device 140 to the routing processing circuit 306; and 306 a routing processing circuit for accumulating the routing information from the processing device 140. , 307 is an interface circuit with the multiplexing section.

Further, each of the routing header conversion circuits 1515150 has a function of distributing communication information from the multiplexing units 132 and 131 using routing information, and similarly to the above procedure,
The routing header conversion circuit 151 converts it into the routing information in the multiplexing section 131, and the routing header conversion circuit 150 converts it into the routing information in the multiplexing section 130. Although this function has been described in terms of a configuration that is incorporated into the routing header conversion circuit 151, the multiplexing unit 132 and Hl
In some cases, the devices may be installed separately, and the present invention also includes a configuration in which they are separated as devices.

FIG. 5 shows a configuration example of the routing header conversion circuit 152, in which 400 is a line interface circuit, and 401 is a circuit that separates the information part and header part of a cell. 402
403 is a circuit that temporarily stores the information part of the cell, and 403 is a circuit that stores the information part of the cell.
1 or 132; 404 is a circuit that synthesizes the information part from circuit 402 and the header part from routing processing circuit 403; 405 is an instruction from processing device 140 to routing processing circuit 40B. A circuit that separates information and cells, 4
06 is a routing processing circuit for routing from the processing device 140, and 407 is an interface circuit with the multiplexing section.

In this circuit, necessary routing headers, such as VPI (Information Network Research Group of Institute of Electronics, Communication and Information Engineers, INS7-84, PI3°22.23), etc., are transmitted between this circuit and the exchange, as well as necessary forwarding and node information other than those shown in Figure 4. The other operations and functions are the same as those shown in FIG. 4, so their explanation will be omitted.

FIG. 6 shows an example of the configuration of a processing device, in which 501 is an interface section with a multiplexing section, and 502 is a control information from a terminal processing circuit or a routing header conversion circuit, or a processing section 5.
503 is a processing unit that converts control information from 03 to these circuits into cells and decells it.

FIG. 7 shows an example of communication between the terminal 101 and the terminal 105, which will be explained according to the communication sequence.

When setting up the three-stage system shown in Figure 1, processing device 1
40 to terminal compatible processing units 111, 112, multiplexing control unit 18G, routing header conversion circuit 150, terminal compatible processing units 113, 124, multiplexing control unit 181,
Routing header conversion circuit 151, terminal compatible processing unit 1
15°I16, multiplexing control unit 162, and routing header conversion circuit 152 are notified that they are dependent, and each terminal corresponding processing unit, routing header conversion circuit, and multiplexing control unit is notified that the processing unit 140 and Regarding the routing of control information transmitted and received between the two, a fixed route is set in advance. When a call is made from the terminal 101, the terminal processing unit 111 performs processing from layer 1 to layer 2, and control information such as call origination is provided with preset routing information and multiplexed by the terminal processing unit 111. The routing header conversion circuit 150 transfers the routing information set for control information to the multiplexing section 13.
The information is transferred to the information from 0 and reaches the processing device 140 via the multiplexing section 131. In the processing device 140, layer 3 processing is performed, and in this case, the desired communication destination is the terminal 10.
5, the processing device 140 transfers the control information to the terminal processing section 115 via the routing header conversion circuit 151, the multiplexing section 132, and the terminal processing section 115, and the terminal processing section 115 converts the layer 1 to layer 2
The terminal 105 performs incoming call processing, sends six calls to the terminal 105, and shifts to a communication state. On the other hand, when the young destination is the terminal 103, as before, the control information is routed via the preset routing header conversion circuit 151 and the multiplexing section 131, and the terminal processing section 113 routes the control information from layer 1. layer 2
The incoming call is processed and the incoming call is received at the terminal 103.

This embodiment is an example in which the processing device is installed in the second stage, and even if it is installed in the multiplexing device in the first or third stage, just by changing the fixed route for transmitting and receiving the $+7 I information, It is obvious that it can work.

FIG. 8 shows a case in which processing devices 141 and 142 are installed in the first and third stage multiplexing devices, respectively, and the routing method at the time of initial setting is the same as described above, but A notification that the processing unit Ill is subordinate is transmitted to the processing units 141 and 142, and from the processing unit 141 via a fixed route, the terminal corresponding processing unit Ill,
112, transmits control information to the multiplexing control unit 160, and transmits the control information from the processing device 142 via a fixed route to the terminal corresponding processing units 115, 118, and the multiplexing unit 111 unit 162. The routing header conversion circuit 152 and the processing unit 140 directly connect the routing header conversion circuit 150 . The terminal processing units 113 and 114 transmit and receive control information to and from the multiplexing control unit 1[fl. That is, a fixed route for control information between each terminal processing unit and the ruching header conversion circuit is set in advance between the processing device of each multiplexing device. In this case, the processing device 140 is controlled via the processing device. As a result, the processing device 140
Functional distribution can be achieved.

Note that a fixed route for control information between each terminal-compatible processing circuit and the routing header conversion circuit may be set in advance between the multiplexing control unit, and in this case, the processing device 14G refers to the multiplexing control unit The configuration is controlled via the .

(Effects of the Invention) As described above, according to the present invention, the terminal processing unit has layers 1 to 2 of the protocol that indicates attributes of the terminal, and processes layer 3 of the protocol that can be commonly handled by media. Processing equipment is installed in only one common location,
By fixing the control route in each terminal processing unit, etc., we have made it possible for multiple multiplexers to use this processing unit in common, so each multiplexer has layer 1
Compared to the case where processing is performed from layer 3 to layer 3, this method is more economical and has the advantage of reducing connection delay associated with processing for each multiplexing device.

Furthermore, in this multiplexing method, since each device is connected to the processing device through a fixed route, there is an advantage that maintenance information can be managed in a unified manner.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the multiplexing system according to the present invention, FIG. 2(a) is a connection block diagram of a multiplex transmission device, and FIG. 2(b) is a connection block diagram of a packet multiplexing device. 3 is a configuration diagram of the terminal processing unit, FIG. 4 is a configuration diagram of the routing header conversion circuit 150, 151, FIG. 5 is a configuration diagram of the routing header conversion circuit 152, and FIG. 6 is the configuration of the processing device. 7 are explanatory diagrams of the operation of the first embodiment, and FIG. 8 is a configuration diagram of the second embodiment of the present invention. 101-106; Terminal, 111-116; Terminal-compatible processing section, 130-132; Multiplexing section, 140-142; Processing device, 150-152; Routing header conversion circuit, 1
60 to 162; multiplex control unit. PMX: Packet multiplexing device ρS: Packet switching device Configuration diagram of packet switching network Figure 2 (b)

Claims (3)

[Claims] (1) Terminal processing unit that performs protocol processing, ATM cellization and decellation processing of communication information from various terminals with different speeds and protocols, and attaches a routing header for routing to the multiplexing unit, and multiple input/output units. A multiplexing unit that has a terminal and performs multiplexing and demultiplexing according to a routing header attached to communication information from the terminal processing unit, and a multiplexing control unit that performs multiplexing and demultiplexing control of the multiplexing unit, In a multiplexing system that interconnects X multiplexers,
One of the multiplexers is equipped with a processing unit, and each multiplexer is interconnected via a routing header conversion circuit. The processing device performs termination processing up to layer 2 of the protocol, and the processing device performs termination processing of layer 3 of the protocol. A virtual route in the multiplexer for transmitting and receiving control information such as routing information and cell header information between terminals is fixedly set at the time of system initialization, and control information is transmitted and received through the virtual route. Based on the control information, the terminal processing unit, the routing header conversion circuit, and the multiplexing control unit arbitrarily set the communication information to be routed to the cell, and the multiplexing unit performs the routing as desired. Characteristic multiplexing method. (2) Routing setting processing is performed for the control information from the processing device via the multiplexing control unit, from the multiplexing control unit to the terminal processing unit and the routing header conversion circuit. (1) Multiplexing method described. (3) Each of the other X-1 multiplexing devices is also provided with a processing device, and the control information is transmitted from one processing device to the other X-1 multiplexing device.
Claim (1) characterized in that routing setting processing is performed from the other X-1 multiplexing devices to the terminal processing unit and the routing header conversion circuit via X-1 multiplexing devices. ) The multiplexing method described.