JPH05102964A - Terminal adaptor system - Google Patents

Abstract

PURPOSE:To easily relay existing interfaces and an ISDN primary group interface. CONSTITUTION:The terminal adaptor system is constituted for containing data terminals having existing interfaces 601-623 in a large bundle use service of 23B+D, 24B/D, etc., of an ISDN primary group interface 300, and each channel 501-523 of the large bundle use is divided, and each channel 501-523 and the existing interfaces 601-623 are relayed through Bch relaying parts 201-223 by one to one, and also, by one each, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal adapter system for relaying a large bundle service (for example, 23B + D or 24B / D) of an ISDN primary group interface and an existing interface.

[0002]

2. Description of the Related Art Generally, an ISDN primary interface (hereinafter referred to as "PRI") 23B + D or 24B.
Since the use of a large bundle such as / D is premised on the use of a private branch exchange, a method using a terminal adapter (hereinafter referred to as "TA") is hardly considered.

By the way, a TA for ISDN basic interface (hereinafter referred to as "BRI") currently exists. BRI is called 2B + D, and 64 kbps consists of 2 channels and 16 kbps consists of 1 channel. Specifically, as shown in FIG. 1, the existing interface processing unit 1 connected to a plurality of existing interfaces, the BRI processing unit 2 connected to the BRI, and the existing interface processing unit 1 and the BRI processing unit 2 are provided. It is composed of a central processing unit 3 for controlling. Further, the processing units 1 and 2 are not required to have high speed because the total amount of processing information is small.

[0004]

By the way, in the case of PRI, since the amount of processing information is large, a sufficiently high processing speed is required. For this reason, the TA method for BRI having the above-described configuration is set to P
When applied to RI, there is a problem in that the processing capabilities of the processing units 1 and 2 are not sufficient and the processing cannot be applied to PRI.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a terminal adapter system suitable for use in a large bundle of PRIs by independently performing relay processing for each channel. To do.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and provides a terminal adapter system for accommodating a data terminal having an existing interface in a large bundle service of an ISDN primary group interface. It is characterized in that each channel used for large bundles is divided, and each channel and the existing interface are relayed in a one-to-one manner and via one relay means each.

[0007]

With the above structure, one existing interface and one channel are controlled by one relay means, and reliable relay can be performed without requiring a high processing speed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, 23B + D will be described as an example of using a large bundle.

FIG. 1 is a block diagram showing a TA of this embodiment. Reference numeral 100 is a central processing unit for controlling call control and states of respective channels, and 200 is a D processing D channel protocol.
Each of the ch processing units 201 to 223 is a Bch relay unit as a relay unit that relays a B channel to be described later and an existing interface on a one-to-one basis.
Reference numerals 223 to 223 include processors and the like. Reference numeral 300 is a PRI using a large bundle, 400 is a PRI layer 1 processing unit for performing layer 1 processing and layer 1 frame division and assembly of the PRI 300, 500 is a D channel divided from the PRI 300, and 501 to 523 are divided from the PRI 300, respectively. Each of 23 B1 to B23 channels is shown.
601 to 623 are B1 to B23 channels 501 to 523
The existing interfaces 601 to 623 are provided in correspondence with the above-mentioned existing interfaces, and the existing interfaces 601 to 623 are respectively possessed by the data terminals (not shown).

Next, a call operation (processing operation in the central processing unit 100) to the ISDN network by the TA having the above configuration will be described with reference to FIG. Note that, here, a case where a call operation is made from the existing interface 601 will be described as an example.

First, the mode is determined from the standby state (S1), and the call instruction mode is determined by the B1 channel 501 call setting request from the Bch relay unit 201 which has received the call instruction of the existing interface 601 (S2). ). Next, the call setup sequence is executed for the Dch processing unit 200 to set up the call for the B1 channel (S3). And
It is determined whether or not the call setting is normally completed (S4), and if it is normally completed, the Bch relay unit 201 is notified of that fact. Then, after receiving the notification, the Bch relay unit 201 notifies the existing interface 601 of the call setup completion, and then B
The ch relay unit 201 is set to the call connection state (S5). As a result, the Bch relay unit 201 relays the data frame between the B1 channel 501 and the existing interface 601. Further, in (S4), if the call setting is not normally completed, the process is ended.

During the data frame relay, when a call disconnection instruction from the existing interface 601 is received via the Bch relay unit 201 or a B1 channel call disconnection from the PRI 300 side is detected via the Dch processing unit 200, the data is transferred. The relay of the frame is disconnected (S6).

Next, the incoming call operation will be described. It should be noted that here also, the case of communication through the existing interface 601 will be described as an example.

First, when the Dch processing unit 200 receives an incoming frame from the D channel 500, it notifies the central processing unit 100 of that fact.

Receiving this, the central processing unit 100 determines the incoming call mode (S2). Next, according to the subaddress of the incoming frame, the corresponding existing interfaces 601-6
23 and B channels 501 to 523 (here, the existing interface 601 and B channel 501) are checked to determine whether or not they are usable (S7). If it is determined that the existing interface 601 cannot be used, the incoming call is rejected (S8). If it is determined that the existing interface 601 is usable (if the existing interface 601 has not set up the call), an incoming call instruction is given to the existing interface 601 (S
9). Next, it is judged whether or not this incoming call instruction has been normally completed (S10), and if it is normally completed, the Dch processing unit 2
00 to make an incoming call response (S11), and put the B1 channel into a call connection state (S12). If the process is not normally completed in (S10), the process ends. As a result, B
The ch relay unit 201 relays a data frame between the B1 channel 501 and the existing interface 601.

After that, the relay of the data frame is disconnected by receiving a call disconnection instruction from the existing interface 601 or by detecting disconnection of the B1 channel call from the Dch processing unit 200 side (S13).

Further, when data is received from the existing interface 601 side in the call connection state, the existing interface side data mode is judged (S2) and the data frame is transmitted on the B channel (S14).

Further, in the call connection state, when data is received from the B channel side, the B channel data mode is judged (S2) and the data frame is transmitted to the existing interface 601 (S15).

As described above, each channel for use in a large bundle is divided, and each B channel 501 to 523 and existing interface 601 to 623 are in a one-to-one correspondence, and one Bch relay unit as a relay means. 201-2
Since the relay is performed via the H.23, the existing interfaces 601 to 623 and the PRI 300 can be easily relayed.

Further, since each B channel 501 to 523 is assigned to the existing interfaces 601 to 623 on a one-to-one basis, the normal data frame relay is all performed in a closed state in the processor of each Bch relay section 201 to 223. It is processed exclusively and does not affect the other Bch relay units 201 to 223. Therefore, each Bch relay unit 201-2
No. 23 is not required to have high speed, and it is sufficient that two 64 kbps can be processed. As a result, the existing interfaces 601 to 623 and the PRI 300 can be easily relayed and the cost can be reduced.

In this embodiment, 23 is used as a large bundle.
Although B + D has been described as an example, the present invention is not limited to this, and any combination of channels including the H0 channel can achieve the same operation and effect as described above.

[0022]

As described above in detail, according to the present invention,
Divide each channel for large bundle use, and each channel and existing interface are one-to-one and one for each
Since the relay is performed via the relay means provided one by one, the existing interface and the PRI can be easily relayed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a terminal adapter of this embodiment.

FIG. 2 is a block diagram showing a conventional terminal adapter.

FIG. 3 is a flowchart showing a processing operation in a central processing unit.

[Explanation of symbols]

 100 Central processing unit 200 Dch processing unit 201 to 223 Bch relay unit 300 PRI 400 PRI layer 1 processing unit 500 D channel 501 to 523 B1 to B23 channel 601 to 623 Existing interface

Claims (1)

[Claims] 1. In a terminal adapter system for accommodating a data terminal having an existing interface in a service of using a large bundle of ISDN primary group interfaces, each channel of using a large bundle is divided, and each channel and the existing interface are one-to-one. And one for each
A terminal adapter system characterized by relaying via successive relaying means.