JPH0583247A - Interface processing system in isdn - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an ISDN interface processing method for performing a required conversion process between a low-order interface and a high-order interface, and to a trunk line side of an ISDN-type switch and It is an object of the data terminal side to be able to perform a required conversion process between a low-order interface and a high-order interface. In the ISDN, a plurality of low-order interface devices 3-i and a high-order interface device 4 respectively connected to the low-order interface devices 3-i are provided,
Transmission is performed between the low-order interface device 3-i and the high-order interface device 4 at a transmission speed corresponding to the low-order interface, and the connection side of the high-order interface device 4 with the low-order interface device 3-i is On the other side, it is configured to perform transmission at a transmission speed corresponding to a higher-order interface.

Description

Detailed Description of the Invention

(Table of Contents) Industrial field of application Conventional technology (FIGS. 15 to 17) Problem to be solved by the invention Means for solving the problem (FIGS. 1 and 2) Action (FIGS. 1 and 2) Example Description of first example (FIGS. 3 to 5) Description of second example (FIGS. 6 to 8) Description of third example (FIGS. 9 to 14)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN interface processing method for performing required conversion processing between a low-order interface and a high-order interface.

[0003]

2. Description of the Related Art Data communication in a conventional enterprise is shown in FIG.
As shown in FIG. 5, the PBX 201 and the analog public network 202
The host computer 205 and the data terminal 2 at a communication speed of 300 bps to 1200 bps using the analog relay line network 203 between companies, the analog line, the modem 204, etc.
It has been performed between 06 or between data terminals 206.

In FIG. 15, 207 is PBX2.
01 and the analog public network 202 as an interface circuit as an analog station trunk, 208 as the PBX 20
1 and the analog trunk line network 203, an analog trunk line trunk as an interface circuit, 209 is a PBX2
01 is an analog subscriber circuit as an interface circuit between 01 and the data terminal 206.

However, as shown in FIG. 16, data communication in a recent enterprise involves improvement of signal conversion technology from analog signals to digital signals in modems, improvement in processing capability of data terminals, and digital lines in enterprises. Digital communication terminal 101, digital trunk line network 1
With the development of digital communication technology such as the spread of 02, data communication is also 1200 bps, 2400 bps, 4800 b
Higher speeds such as ps, 9600 bps, ...

In FIG. 16, 103 is a PBX that can handle both analog and digital, and 104 is a PB.
A digital trunk trunk as an interface circuit between the X103 and the digital trunk network 102;
Is a digital subscriber circuit as an interface circuit between the PBX 103 and the data terminal 206.

Further, digital public networks and ISN nets 64 (ISDN-BRI) and 1500 (ISDN-P) are used.
RI) service and IS of high-speed digital relay network
With the shift to DN, the speed of data communication has been increased.

Particularly, with the start of services of the INS Net 1500 and the ISDN-ized high-speed digital trunk line network,
PBX to INS Net 1500 (1.544 Mbps)
And digital relay line (1.544 Mbps, 2.048
Mbps), and data communication is 64 kbps or more. For example, by using the INS Net 1500 or a high-speed digital relay line network for introducing a TV conference system or transferring files between host computers, H0 (384 kbp)
s) and H1 (1536 kbs).

However, as the demand for the TV conference system and the communication between host computers increases, the high-speed data communication such as H0 and H1 described above can be simultaneously performed by several lines, which allows the INS net 1500 and the high-speed digital relay line. (1.544Mbps, 2.048Mb
ps) has to increase the number of accommodated lines to the PBX, but rather than increasing these accommodated lines,
By accommodating higher order digital trunk lines in the PBX, there is a demand to reduce the cost of the line usage fee of the high speed digital trunk lines.

On the other hand, an interface method between the PBX side and the terminal, which utilizes the multiple D channel signaling method on the subscriber and line link sides, rather than on the trunk link side of the trunk line between PBX and PBX, can be considered.

In this case, as shown in FIG. 17, data terminals and ISDN basic interface (ISDN-BRI: 2B + D) terminals 301-1 to 30 are placed on the desks of the respective persons.
1-n (including a card to be inserted into the expansion slot of the data terminal) is placed, and data communication between the data terminal and the host computer via the PBX 302 is performed at high speed using the ISDN line. In this case, the ISDN basic interface terminals 301-1 to 301-n are directly accommodated in the PBX 302.

[0012]

However, in the conventional example shown in FIG. 16, the PBX 103 has a capacity of 64 kbp.
Since the basic operation is 2.048 Mbps for s, 32 ch, it is not possible to easily accommodate an interface of 2.048 Mbps or higher, for example, a higher-order interface line of 6.352 Mbps.

Further, as shown in FIG. 17, in the case where each ISDN basic interface terminal is directly accommodated in the PBX, many signal transmission wires are required depending on the arrangement of each terminal.

The present invention was devised in view of the above problems, and performs necessary conversion processing between a low-order interface and a high-order interface on the trunk line side and the data terminal side of an ISDN type exchange. An object is to provide an interface processing method in ISDN that can be performed.

[0015]

FIG. 1 is a block diagram of the principle of the first invention. In FIG. 1, reference numeral 1 is an exchange, 2 is a digital network, and the exchange 1 has a plurality (n) of low order. Interface devices 3-i (i = 1, 2, ..., N) are connected.

Further, 4 is each low-order interface device 3-
i is a high-order interface device connected to each i, and the high-order interface device 4 is further connected to the digital network 2.

Then, transmission is performed between the low-order interface device 3-i and the high-order interface device 4 at a transmission speed corresponding to the low-order interface, and the low-order interface device 3-i of the high-order interface device 4 is transmitted. On the side (digital network 2 side) opposite to the connection side with, the transmission is performed at a transmission speed corresponding to a higher-order interface.

In the high-order interface device 4, low-order interfaces are multiplexed to make a single line to the high-order interfaces, and high-order interfaces are separated to make a plurality of lines to the low-order interfaces. Multiple /
A separation unit 41 is provided.

Further, the high-order interface device 4 includes
A high-order interface terminating unit 42 that terminates the high-order interface, and a time switching unit 43 that can convert data at an arbitrary position on the high-order interface to an arbitrary position on the low-order interface (this function is performed by the multiplexing / separating unit 41 And) are provided.

Further, the high-order interface device 4 is provided with a conversion unit 44 for converting maintenance information on the high-order interface into a low-order interface, and the low-order interface device 3-i processes the maintenance information. Is configured to do.

FIG. 2 is a block diagram of the principle of the second invention. In FIG. 2, reference numeral 1 is an exchange, and the exchange 1 accommodates a plurality (n) of low-order interface devices 5-i. However, each low-order interface device 5-i is an IS
It is configured as a DN basic interface terminal.

A high-order interface device 6 is provided between the exchange 1 and the low-order interface device 5-i, and the high-order interface device 6 is constructed as an ISDN primary group speed interface device.

Between the low-order interface device 5-i and the high-order interface device 6, data is transmitted at a transmission speed corresponding to the low-order interface (ISDN basic interface), and the exchange 1 and the high-order interface device 6 are connected. In between, the transmission is performed at the transmission speed of the high-order interface (ISDN primary rate interface).

[0024]

In the interface processing method in the ISDN of the present invention shown in FIG. 1, the low-order interface device 3 is used.
-I and the high-order interface device 4 are transmitted at a transmission speed corresponding to the low-order interface, and on the opposite side (digital side) from the connection side of the high-order interface device 4 with the low-order interface device 3-i. On the network 2 side), transmission is performed at a transmission speed corresponding to a high-order interface.

At this time, the high-order interface device 4
In the multiplexer / demultiplexer 41, the low-order interfaces are multiplexed to make a single line to the high-order interfaces, and the high-order interfaces are separated to make a plurality of lines to the low-order interfaces.

Further, in the high-order interface device 4,
The high-order interface terminating unit 42 terminates the high-order interface, and the time switching unit 43 converts data at an arbitrary position on the high-order interface into an arbitrary position on the low-order interface. Furthermore, the conversion unit 45 converts the maintenance information on the high-order interface into the low-order interface, and the low-order interface device 3-i.
At, the maintenance information is processed.

Further, the ISD of another invention shown in FIG. 2 described above.
In the interface processing method in N, transmission is performed between the low-order interface device 5-i and the high-order interface device 6 at a transmission speed corresponding to the low-order interface (ISDN basic interface), and at the same time, the exchange 1 and the high-order interface. Data is transmitted to and from the device 6 at the transmission rate of the higher-order interface (ISDN primary rate interface).

[0028]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment FIG. 3 is a block diagram showing a first embodiment of the present invention. In FIG. 3, 11 is a PBX as an exchange and 12 is a digital trunk network. , ISDN-PRI trunk line trunks 13-1 to 13-4 as low-order and existing interface devices are connected.

Reference numeral 14 denotes an adapter as a high-order interface device connected to each ISDN-PRI trunk line trunk 13-j (j = 1 to 4). This adapter 14 is further used for the digital trunk line network 12. It is connected to the.

Then, transmission is performed between the ISDN-PRI trunk line trunk 13-j and the adapter 14 at a transmission speed (1.544 Mbps) corresponding to a low-order interface, and at the side of the digital trunk network 12 of the adapter 14. , The transmission speed equivalent to the higher-order interface (6.352)
Mbps). Therefore,
In this embodiment, the low-order interface is a 1.544M interface (ISDN-PRI interface; IS
DN primary group speed interface), and the higher-order interface is 6.352M interface (ISDN-SR).
I interface; ISDN secondary group velocity interface).

The adapter 14 also includes a multiplexer / separator (M
UX / DMUX) 15,6.352M transmission unit (SRID
/ R) 16, ISDN-PRI transmission unit (PRID / R)
17-1 to 17-4 and a firmware processor 18.

Here, the multiplexing / demultiplexing unit 15 is 1.544.
The M interface is multiplexed to make a single line to the 6.352M interface, and the 6.352M interface is separated to make a plurality of lines to the 1.544M interface. Furthermore, on the 6.352M interface. It also has a function as a time switching unit capable of converting data at an arbitrary position into an arbitrary position of the 1.544M interface.

The 6.352M transmission unit 16 has a 6.352M
The ISDN-PRI transmission unit 17-j functions as a high-order interface termination unit that terminates the interface.
Is for performing interface processing such as assembling to a 1.544M interface.

Further, the firmware processor 18 uses 6.3.
Maintenance information such as alarms on the 52M interface
The maintenance information is processed by the ISDN-PRI trunk trunk 13-j.

Further, as shown in FIG. 4, the ISDN-PRI trunk trunk 13-j has a 2M highway interface 19-j, a line processor 20-j, a D channel processing section 21-j and an ISDN-PRI transmission section 22.
-J.

Here, the 2M highway interface 1
9-j is connected to the 2M highway of PBX11,
The switching operation is performed.

The line processor 20-j is connected to the PBX 11
It receives the D channel information from the attached call processor (CPR) and outputs the control signal for the switching operation of the 2M highway interface 19-j. D
The channel processing unit 21-j includes the line processor 20-j.
The desired processing is performed on the D channel information that has passed through the.

The ISDN-PRI transmission unit 22-j is 2M
A call / data signal (for 23B channels) from the highway interface 19-j and a D channel processing unit 21-
i signal / alarm signal (for D channel)
This is to carry out processing for loading onto the SDN-PRI digital line. The structure of this ISDN-PRI trunk line 13-j is almost the same as that of the existing low-order interface processing.

With this configuration, when transmitting a signal from the digital trunk line network 12 to the PBX 11,
The end of the 352M interface is 6.
After being carried out by the 352M transmission unit 16, the call / data is decomposed by the MUX / DMUX 15 for the 1.544 Mbps interface, and this is decomposed into each ISDN-PRI transmission unit 17.
-J, where the assembly to the ISDN-PRI interface is done. After that, the corresponding ISD
It is transmitted to the N-PRI trunk trunk 13-j.

Further, an alarm of the 6.352 Mbps interface or the like is sent from the 6.352M transmission unit 16 to the firmware processor 18, and the alarm on the 6.352 Mbps interface is converted into the alarm on the 1.544 Mbps interface, and ISDN-PRI. Transmission unit 17
-J, embedded in the ISDN-PRI interface and transmitted to the ISDN-PRI trunk 13-j.

Then, with the adapter 14 described above, the IS
Those converted to the DN-PRI interface are IS
At the DN-PRI trunk trunk 13-j, it is processed in the same manner as the existing interface.

On the other hand, when transmitting a signal from the PBX 11 to the digital trunk line network 12, the ISDN-PRI trunk line 13-j performs the same processing as the existing interface, and then the ISDN-PRI of the adapter 14.
6.3 in the MUX / DMUX 15 via the transmission unit 17-j.
After being multiplexed for the 52 Mbps interface and made into a single line, it is sent to the digital trunk line network 12 via the 6.352M transmission unit 16.

As a low-order interface, 1.5
Instead of using the 44M interface (ISDN-PRI interface), the 2.048M interface may be used.

Further, as shown in FIG. 5, maintenance information such as alarms on the 6.352M interface can be displayed at 1.544M.
It goes without saying that the present invention can be applied to a case in which the firmware processor 18 for converting into an interface is omitted.

In this way, the adapter 14 terminating the 6.352 Mbps interface is used, and the adapter 1
By converting to an interface and line speed that can be easily processed by the PBX 11 according to 4, there are the following advantages.

(1) Since the high-order interface of 6.352 Mbps is not directly accommodated but is decomposed into the low-order interface of 1.544 Mbps or 2.048 Mbps and accommodated in the PBX 11, the basic parts such as switches are changed. Is not necessary.

(2) 2.0 disassembled by the adapter 14
By using a low-order interface of 48 Mbps or 1.544 Mbps as an interface similar to the INS net 1500 or the digital trunk line, the existing device for the INS net 1500 and the device for the digital trunk line can be used.

(3) Since the adapter 14 converts to a low-order and existing interface, existing software can be used.

(4) In the case of 6.352 Mbps, 96 time slots must be managed. However, because the adapter 14 reduces the management to 24 time slots or 32 time slots, software management is not possible. Will be reduced.

(B) Description of Second Embodiment FIG. 6 is a block diagram showing a second embodiment of the present invention. The second embodiment shown in FIG. 11 is different from the above-described first embodiment in that a low-order and unique interface device for low-order and unique interface used for serial data transmission by 11 or the like is used.

That is, in the second embodiment, PBX1
1, digital interface trunks 13'-1 to 13'-4 as low-order and unique interface devices are connected.

An adapter 14 'as a high-order interface device is connected between each digital interface trunk 13'-j and the digital trunk line network 12.

Also in this case, the transmission rate (1.544M) corresponding to the low-order interface is provided between the digital interface trunk 13'-j and the adapter 14 '.
transmission is performed at the transmission speed of 6.352 Mbps, which is equivalent to a higher-order interface, on the side of the digital relay line 12 of the adapter 14 '.

The adapter 14 'includes a multiplexer / demultiplexer (MUX / DMUX) 15, 6.352M transmitter (SR).
ID / R) 16, digital transmission unit (DD / R) 1
7'-1 to 17'-4 and a firmware processor 18 are provided.

Here, the multiplexer / demultiplexer 15, 6.352M
The transmission unit 16 and the firmware processor 18 are almost the same as those in the above-described first embodiment. Digital transmission unit 17 '
-J is for performing interface processing such as assembling into a low-order and unique interface.

Further, the digital interface trunk 13'-j is, as shown in FIG. 7, a 2M highway interface 19'-j and a line processor 20'-.
j, D channel processing unit 21'-j and ISDN-PR
The digital interface trunk 13'-j has a structure similar to that of the ISDN-PRI trunk line 13-j, and has its own low-order interface processing. It is almost the same as the case of applying. The line processor 20'-
IS that bypasses the D channel processing unit 21'-j from j
The signal line to the DN-PRI transmission unit 22'-j is for alarm.

With such a configuration, when transmitting a signal from the digital relay line network 12 to the PBX 11,
The terminal of the 352M interface is terminated by the 6.352M transmission unit 16, and the call / data is MUX / DMUX15.
Then, it is disassembled for 1.544 Mbps interface and transmitted to the corresponding digital interface trunk 13'-j via the digital transmission unit 17'-j.

Further, an alarm or the like of the 6.352 Mbps interface is sent from the 6.352M transmission unit 16 to the firmware processor 18, and the alarm on the 6.352 Mbps interface is converted to the digital transmission unit 1.
7'-j, and is transmitted to the digital interface trunk 13'-j by another line.

The call / data digitally transmitted by the adapter 14 'is sent to the digital transmission unit 17'-.
At j, the call / data and the D channel signal are decomposed, and the call / data is 2M highway interface 19'-j.
Connected to the highway of PBX 11.

The D channel is the D channel processing unit 21'-j.
Information is processed by the line processor 20'-j, and is transmitted to the call processor (CPR; the part that performs call processing of PBX). Information such as an alarm is transmitted by a separate line and sent from the digital transmission unit to the line processor 20'-j for processing.

On the other hand, when transmitting a signal from the PBX 11 to the digital trunk line network 12, the digital interface trunk 13'-j performs the same processing as the original interface, and then the ISDN-of the adapter 14 '.
MUX / DMUX 15 via PRI transmission unit 17'-j
Then, the signals are multiplexed for the 6.352 Mbps interface to form a single line, and then sent out to the digital trunk line network 12 via the 6.352M transmission unit 16.

As a low-order interface, 1.5
Instead of using the 44M interface (ISDN-PRI interface), the 2.048M interface may be used.

Further, as shown in FIG. 8, maintenance information such as alarms on the 6.352M interface can be displayed at 1.544M.
It goes without saying that the present invention can be applied to a case in which the firmware processor 18 for converting into an interface is omitted.

The adapter 14 'that terminates the 6.352 Mbps interface in this way is used.
By converting the interface and line speed that can be easily processed by the PBX 11 by means of 4 ', the same effects and advantages as those of the first embodiment can be obtained, and the adapter 1
Since the 4'-low-order interface device 13'-j is used as a unique interface, it is possible to reduce the transmission section circuit between the adapter 14'-low-order interface device 13'-j.

Even in the case of converting to a low-order and unique interface in this way, the existing software can be used by using a hardware configuration equivalent to that of the existing interface device in terms of software.

(C) Description of Third Embodiment FIG. 9 is a block diagram showing a third embodiment of the present invention. In FIG. 9, 31 is a PBX, and this PBX 31 has, for example, eight ISDN basics. Interface terminals (low-order interface devices) 35-1 to 35-8 are housed.

Further, the PBX 31 and the ISDN basic interface terminal (ISDN-BRI terminal) 35-k (k = 1)
8 to 8), an ISDN primary rate interface terminal (higher-order interface device) 36 is provided.

Then, the ISDN basic interface terminal 35-k and the ISDN primary rate interface terminal 36.
And the transmission at a transmission speed equivalent to the ISDN basic interface (BRI interface),
PBX31 and ISDN primary rate interface terminal 3
6 and the ISDN primary rate interface (P
(RI interface) Transmission is performed at a transmission speed equivalent to that of the RI interface.

By the way, the PBX 31 has a speech path 32 (this speech path 32 has a main control section and a main storage section not shown) and an interface section 32. Here, since the communication path 32 is a known one, the description thereof will be omitted. However, the interface unit 33 functions as a transmission termination unit of the ISDN-PRI interface.
It has a multiplexing / separating function of multiplexing / separating the B channel and the D channel among the channels, a function of arbitrarily switching the B channel, and a function of processing a plurality of D channels. It should be noted that the interface unit 33 does not perform the ISDN-PRI 23B + D process on software but performs a process of accommodating eight 2B + D lines.

For this reason, the interface unit 33 has the same configuration as that of FIG.
0, the multiplexer / demultiplexer (MUX / DMUX) 3
4, a switch unit 37, a D channel processing unit 38, a PRI transmission unit 39, and a line processor (LPR) 40.

Here, the multiplexing / demultiplexing unit 34 multiplexes / demultiplexes the B channel and the D channel out of the 24 channels, and the switch unit 37 performs arbitrary switching of the B channel and performs the D channel processing. The unit 38 processes a plurality of D channels, and the PRI transmission unit 39 uses the IS.
The ISDN basic interface from the DN basic interface terminal 35-k is terminated, and the line processor 40 outputs a signal for switching control of the switch section 37 based on the D channel information from the D channel processing section 38. Is.

Further, the ISDN primary rate interface terminal 36 has eight I channels for the 24 channels from the PBX 31.
It has a hardware function to multiplex / separate to the SDN-BRI interface, but as software processing,
Only the alarm processing on the ISDN-BRI side and the ISDN-PRI layer 1 is performed. That is, ISD
The N primary group velocity interface terminal 36 includes a multiplexing / demultiplexing unit 51, a PRI transmission unit 52, and a BRI transmission unit 53-k.

Here, the multiplexer / demultiplexer 51 uses the PBX 31
24 channels from the above are multiplexed / demultiplexed into eight ISDN-BRI interfaces.
The PRI interface is terminated, and the BRI transmission unit 53-k terminates the BRI interface.

As described above, the interface between the PBX 31-ISDN primary group speed interface terminal 36 is ISD.
Since the ISDN-BRI interface is provided between the ISDN primary group speed interface terminal 36 and the ISDN basic interface terminal 35-k, which corresponds to the N-PRI line interface line, the interface between the PBX 31-ISDN primary group speed interface terminal 36 is 2
The 4-channel configuration is a multi-D channel configuration.
Also, the ISDN primary rate interface terminal 36-I
ISDN between SDN basic interface terminals 35-k-
The BRI interface is 2B +, as shown in FIG.
It is assumed that D is multiplexed for 8 lines. Here, the B channel is 8 bits and 64 Kbps, and the D channel is 2 justified.
The configuration is 16 Kbps in bits. This is PBX3
ISDN-PRI that accommodates multiple D channels on the first side
Manage as a terminal. In the ISDN primary rate interface terminal 36, the PBX 31 to 24 channels,
8 × (2B + D) to ISDN-PRI terminal 35-k 2
It is simply distributed as B + D, and 2B + D from the ISDN basic interface terminal 35-k is multiplexed into 24 channels. As a result, the ISDN basic interface terminal 35-k needs only the multiplexing / demultiplexing function as the hardware configuration. The channel structure of the ISDN primary rate interface is as shown in FIG.

With this configuration, the PBX31-IS
By adopting the multiple D channel system as the interface between the DN primary rate interface terminals 36, the following advantages can be obtained.

(1) ISDN basic interface (BR
When 8 terminals of I) are installed, PBX31 to ISD
Up to N basic interface terminals 35-k required 8x4 wires. However, with this configuration, as shown in FIG. 14, the ISDN primary rate interface terminal 36
Up to 4 wires are installed up to ISDN primary speed interface terminal 36 to ISDN basic interface terminal 3
It is enough to install 8x4 wire up to 5-k. That is, the ISDN basic interface terminal 35-k
If the ISDN primary group speed interface terminal 36 is installed on the floor, P
It is sufficient to install 4 wires from the BX to the ISDN primary group speed interface terminal 36 on the floor, and install 8 × 4 wires from the ISDN primary group speed interface terminal 36 to the ISDN basic interface terminal 35-k in the floor. This allows PBX31 to IS
The number of wires installed up to the DN basic interface terminal 35-k is reduced.

(2) If the ISDN primary group speed interface terminal 36 has one D-channel type, the ISDN primary group speed interface terminal 36
It is necessary to analyze the information of the D channel at and distribute it to the ISDN basic interface terminal 35-k, and increase the amount of each D channel information of the ISDN basic interface terminal 35-k to one D channel. However, the ISDN primary rate interface terminal 3 configured to adopt the multiple D channel system
6 physically separates the channel from the PBX, ISDN
The channel information from the ISDN basic interface terminal 35-k is simply distributed to the basic interface terminal 35-k. As a result, the ISDN primary group speed interface terminal 36 configured by the multiple D channel system is easier to configure in both hardware and software.

[0078]

As described above in detail, the ISDN of the present invention
According to the interface processing method in (1), in the exchange, a device for terminating the high-order interface is provided to accommodate the high-order interface line, and the high-order interface is demultiplexed / multiplexed by this device, and the low-order can be processed by the exchange. Since multiple lines are connected to the interface, the following effects or advantages can be obtained.

(1) As a contract on the line of the high-speed digital relay line, it suffices to accommodate a high-order interface, which can reduce the cost of the line charge.

(2) As for accommodation in the exchange, it is sufficient to accommodate it as a conventional low-order interface.

In the ISDN interface processing system of the present invention, the following effects and advantages are obtained by using the multiple D channel system as the interface between the exchange and the higher order interface device.

(1) Low-order interface device (ISDN
In the case where the basic interface terminal is installed on the same floor, a high-order interface device (ISDN primary group speed interface terminal) is installed on that floor, and a high-order interface device on the floor from the exchange (ISDN primary group speed interface terminal) Up to 4 wires are installed in the floor, and the high-order interface device (ISDN primary group speed interface terminal) to the low-order interface device (I
It is sufficient to install n × 4 wires up to the SDN basic interface terminal), which can reduce the number of wires installed from the exchange to the low-order interface device (ISDN basic interface terminal).

(2) Higher-order interface device (ISDN
As the configuration of the primary group velocity interface terminal), a plurality of D
In the case of the channel system configuration, the channels from the exchange are physically separated and the low-order interface device (ISD) is used.
N basic interface terminals), and channel information from a low-order interface device (ISDN basic interface terminal) is simply channel-multiplexed.
The higher-order interface device (ISDN primary group speed interface terminal) configured by the multiple D channel system is easier to configure in both hardware and software.

[Brief description of drawings]

FIG. 1 is a principle block diagram of a first invention.

FIG. 2 is a principle block diagram of a second invention.

FIG. 3 is a block diagram showing a first embodiment of the present invention.

FIG. 4 is ISDN-PRI in the first embodiment of the present invention.
It is a block diagram showing a trunk trunk.

FIG. 5 is a block diagram showing a modification of the first embodiment of the present invention.

FIG. 6 is a block diagram showing a second embodiment of the present invention.

FIG. 7 is a block diagram showing a digital interface trunk according to a second embodiment of the present invention.

FIG. 8 is a block diagram showing a modification of the second embodiment of the present invention.

FIG. 9 is a block diagram showing a third embodiment of the present invention.

FIG. 10 is a block diagram showing a PBX in a third embodiment of the present invention.

FIG. 11 is a block diagram showing an ISDN primary rate interface device according to a third embodiment of the present invention.

FIG. 12 is a diagram showing a channel configuration of a third exemplary embodiment of the present invention.

FIG. 13 is a diagram showing a channel configuration according to a third embodiment of the present invention.

FIG. 14 is a schematic diagram illustrating a wiring state from the PBX to each terminal in the third embodiment of the present invention.

FIG. 15 is a block diagram illustrating a conventional data communication network in a company.

FIG. 16 is a block diagram illustrating a data communication network in a recent company.

FIG. 17 is a block diagram showing a conventional example in the case of accommodating a plurality of terminals in a PBX.

[Explanation of symbols]

1 Switch 2 Digital network 3-i Low-order interface device 4 High-order interface device 5-i Low-order interface device configured as ISDN basic interface terminal 6 High-order interface device configured as ISDN primary rate interface terminal 11 As switch PBX 12 Digital trunk line network 13-j I as a low-order and existing interface device
SDN-PRI trunk line trunk 13'-j Digital interface trunk as low-order and unique interface device 14,14 'Adapter as high-order interface device 15 Multiplexing / separating unit 16 6.352M transmission unit (SRID / R) 17- j ISDN-PRI transmission unit 17'-j digital transmission unit 18 firmware processor 19-j, 19'-j 2M highway interface 20-j, 20'-j line processor 21-j, 21'-j D channel processing unit 22 -J, 22'-j ISDN-PRI transmission unit 31 PBX 32 speech path 33 interface unit 34 multiplexing / demultiplexing unit 35-k ISDN basic interface terminal (low-order interface device) 36 ISDN primary group speed interface device (high-order interface device) ) 37 Switch unit 38 D channel processing unit 39 PRI transmission unit 40 Line processor (LPR) 41 Multiplexing / separating unit 42 Higher-order interface termination unit 43 Time switching unit 44 Conversion unit 51 Multiplexing / separating unit 52 PRI transmitting unit 53-k BRI transmitting unit 101 Digital Communication Terminal 102 Digital Trunk Network 103 PBX 104 Digital Trunk Trunk 105 Digital Subscriber Circuit 201 PBX 202 Analog Public Network 203 Analog Trunk Network 204 Modem 205 Host Computer 206 Data Terminal 207 Analog Trunk Trunk 208 Analog Trunk Trunk 209 Analog subscriber circuit 301-i ISDN basic interface terminal 302 PBX

Claims (6)

[Claims] 1. An ISDN comprising a plurality of low-order interface devices (3-i) and a high-order interface device (4) respectively connected to the low-order interface devices (3-i), Transmission is performed between the interface device (3-i) and the high-order interface device (4) at a transmission speed corresponding to a low-order interface, and the low-order interface device (3) of the high-order interface device (4) is transmitted. -The interface processing method in ISDN characterized in that transmission is performed at a transmission speed corresponding to a higher-order interface on the side opposite to the side connected to i). 2. The high-order interface device (6) is multiplexed with the low-order interface to form a single line to the high-order interface, and the high-order interface is separated to connect to the low-order interface. A multiplexing / demultiplexing unit (41) for making a plurality of lines is provided.
The interface processing method in ISDN according to claim 1. 3. A high-order interface terminating unit (42) for terminating the high-order interface and data at an arbitrary position on the high-order interface in the high-order interface device (6). The interface processing method in ISDN according to claim 1, further comprising a time switching unit (43) capable of converting the position to the position. 4. The high-order interface device (6) is provided with a conversion unit (44) for converting maintenance information on the high-order interface to the low-order interface, and the low-order interface device (3-i). 4. The interface processing method in ISDN according to claim 2 or 3, characterized in that the maintenance information is processed. 5. The ISDN comprises an exchange (1) and a plurality of low-order interface devices (5-i) housed in the exchange (1), and the exchange (1) and the low-order interface device (5). 5-i)
A high-order interface device (6) is interposed between the low-order interface device (5-i) and the high-order interface device (6) to perform transmission at a transmission speed corresponding to the low-order interface. An interface processing method in ISDN, characterized in that transmission is performed at a transmission speed corresponding to a high-order interface between the exchange (1) and the high-order interface device (6). 6. The low-order interface device (5-i) is configured as an ISDN basic interface terminal, and the high-order interface device (6) is configured as an ISDN primary group speed interface terminal. Between (5-i) and the higher-order interface device (6), transmission is performed at a transmission speed corresponding to the ISDN basic interface, and between the exchange (1) and the higher-order interface device (6). The ISDN interface processing method according to claim 4, wherein transmission is performed at a transmission speed corresponding to the ISDN primary rate interface.