JPH0522342A - Isdn d-channel signal processing system for private electronic branch exchange - Google Patents

Abstract

PURPOSE:To attain the ISDN D-channel packet data communication by using a packet data terminal equipment accommodated in a private branch exchange. CONSTITUTION:A B-channel signal in an ISDN TRK 2 is connected to an exchange switch 3 as a 64kbps data. A D-channel signal is distributed in a transmission line according to a value of an SAPI in a D-channel signal layer 2 address field in the ISDN TRK 2. In the case of SAPI=0, the signal is given to a basic interface trunk CPU in the ISDN TRK 2 as call control procedure information. In the case of SAPI=16, the data speed is converted from 16kbps into 64kbps in the ISDN TRK 2 as packet communication information and the resulting data is connected to the exchange switch 3. The signal is decoded into the D-channel signal with 16kbps at a data adaptor via the exchange switch 3 and sent to a packet data terminal equipment 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IS of an electronic private branch exchange.
The present invention relates to a DN D channel signal processing system, and particularly to an electronic private branch exchange having an ISDN basic interface connection mechanism.
The present invention relates to an SDN D channel signal processing system.

[0002]

2. Description of the Related Art Conventionally, this type of electronic private branch exchange IS
In the DN D channel signal processing method, all the D channel signals are taken in and processed by the ISDN basic interface CPU.

[0003]

As described above, in the conventional ISDN D-channel signal processing method of the electronic private branch exchange, since the ISDN basic interface CPU takes in and processes all the D-channel signals, the D-channel packet processing is performed. There is a problem that it is difficult to transmit the signal to the data terminal accommodated in the electronic private branch exchange.

[0004]

According to the ISDN D channel signal processing method of an electronic private branch exchange of the present invention, a 2B + D signal from an ISDN network is supplied to two B channels in an electronic private branch exchange having an ISDN basic interface connection mechanism. A signal and one D channel signal, the B channel signal is transparently connected to a switch as a 64 kbps signal, and the D channel signal is a service access point identifier 0 by a layer 2 service access point distribution device. The ISDN basic interface trunk CPU reads out the signal contents, and in the case of the service access point identifier 16, the D channel signal speed converter converts the D channel signal of 16 kbps into 6
An ISDN basic interface trunk having a transmission control means for converting into a signal of 4 kbps and transmitting the signal to the exchange switch is provided, and a D channel is accommodated in the electronic private branch exchange to a packet data terminal designated by call control information. The 64 kbp from the switch
A data adapter is provided for returning the signal converted into s to the D channel signal of 16 kbps and transmitting it to the packet data terminal.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 shows an ISDN basic interface trunk in this embodiment, (a) is a block diagram thereof, and (b) is an ISDN basic interface trunk. 3 is a diagram showing an example of a speed conversion format of the D channel signal of FIG.

In FIG. 1, the present embodiment is an electronic private branch exchange 20 having an ISDN basic interface connection mechanism.
Packet data terminal 5 accommodated in electronic private branch exchange 20
And an electronic private branch exchange 20 which interfaces with an ISDN network.
An SDN basic interface trunk 2 and an ISDN basic interface trunk 2 accommodating a data adapter 4
Switch 3 to be connected to the electronic private branch exchange 20
The data adapter 4 has a switch CPU 1 for controlling the entire system, and the data adapter 4 has a function of returning the signal converted to 64 kbps from the switch 3 to a D channel signal of 16 kbps and transmitting it to the packet data terminal 5. There is.

In FIG. 2A, the ISDN basic interface trunk 2 in this embodiment is an ISDN signal channel distributor for distributing a signal of 2B + D channel configuration from the ISDN network into two B channel signals and one D channel signal. 10 and the layer 2 service access point identifier from the D channel signal (hereinafter referred to as SAPI)
Layer 2 service point distribution device 11 that reads out and distributes the value of D and the D channel signal as packet communication information when SAPI = 16 from 16 kbps to 64 kbps
D channel signal speed conversion device 12 for converting to
ISDN basic interface trunk CPU 1 for processing D channel signal as call control procedure information when I = 0
3 and 3.

FIG. 2B shows 16 kbps to 64 kb.
An example of the conversion method for speed conversion to ps is shown. In the case of a converter switch that realizes a communication speed of 64 kbps with 8-bit data, 2 bits out of 8 bits are used to
Data of 6 kbps can be transmitted. In the case of the present embodiment, an example using 2 bits of b0 and b1 is shown.

Next, the operation of this embodiment will be described with reference to FIGS.

A signal of 2B + D channel configuration sent from the ISDN network is distributed by the ISDN signal channel distributor 10 into two B channel signals and one D channel signal. Each of the two B channel signals is 64 kbp
It is connected to the exchange switch 3 as s data. The D channel signal is distributed by the layer 2 service access point identifier distribution device 11 according to the value of SAPI in the D channel signal layer 2 address field. When SAPI = 0, a signal is passed to the ISDN basic interface trunk CPU 13 as call control procedure information. When SAPI = 16, a signal is passed to the D channel signal speed conversion device 12 as packet communication information, and the D channel signal speed conversion device 12 outputs 16 kb.
It is converted from ps to 64 kbps and is connected to the exchange switch 3. The D channel signal converted to 64 kbps is connected to the data adapter 4 by the exchange switch 3, and the data adapter converts the 64 kbps signal to 16 kbp.
The packet data terminal 5 restores the D channel signal of s
Sent to.

FIG. 3 is a system configuration diagram showing an application example of this embodiment, and FIG. 4 is a diagram showing a control sequence in the application example shown in FIG.

In FIG. 3, in the present application example, from the packet data terminal 5a accommodated in the electronic private branch exchange 3a of the present embodiment to the packet data terminal 5b accommodated in the electronic private branch exchange 3b of the present embodiment, via the ISDN network 6. This shows a case where D channel packet data communication is performed.

Next, the operation of this application example will be described with reference to FIGS.
Will be explained together.

First, in the originating station, when the originating operator presses the originating button of the data adapter 4a, the exchange CPU (hereinafter referred to as PBX CPU) 1a of the originating station becomes I
SDN basic interface trunk (hereinafter ISDN / T
RK) 2a transmits SABME (extended asynchronous balanced mode) to ISDN network 6 (S1). ISDN network 6 is SA
When BME is received, UA (unnumbered confirmation) is returned (S
2). The PBX CPU1a receives the UA and receives the ISDN
The TRK2aD channel and the data adapter 4a are connected by the exchange switch 3a.

As a result, the packet data terminals 5a and I
The SDN network 6 is transparently connected at a transmission rate of 16 kbps (S3). After this, the packet data terminal 5a transmits SABM (asynchronous balanced mode) to the ISDN network 6 (S4), and when receiving a UA from the ISDN network 6 (S6), sends a CCITT X25 (hereinafter X25) call request packet to the ISDN network. 6 (S6).

When the ISDN network 6 receives a calling request from the calling station, the ISDN network 6 sends a D channel call control procedure (SAP) to the called station.
I = 0) is used to perform the following incoming control. First, the ISDN network 6 sends a UI (call setting) to the called station.
Send a message. In the called station ISDN / TRK2b, the call control procedure information (SAPI = 0) is added to the ISDN / TRK2b.
TRKCPU 13 (see FIG. 2 (a)) reads and PB
Information is sent to the X CPU 1b (S7).

When the PBX CPU 1b determines the incoming packet data terminal based on the call control procedure information (SAPI = 0), it sends SABME from the ISDN / TRK 2b to the ISDN network 6 (S8) and receives the UA from the ISDN network 6. Return the response message (S10), then ISD
Upon receiving a response confirmation message from the N network 6 (S11),
The ISDN / TRK 2b and the data adapter 4b are connected by the exchange switch 3b (S12). This allows
16 kb between ISDN network 6 and packet data terminal 5b
It is transparently connected at a transmission rate of ps.

After that, the SABM is sent from the ISDN network 6 (S13), and the terminating side packet data terminal 5b returns UA (S14). The incoming call packet is transmitted (S15). The packet data terminal 5b on the called side receives X25. When responding with an incoming call acceptance packet (S1
6), the ISDN network 6 is a packet data terminal 5a on the sending side.
To X25. By transmitting the incoming call completion packet, the data link between the source packet data terminal 5a and the destination packet data terminal 5b is established, and the data communication phase is set (S17).

[0020]

As described above, according to the present invention, the D channel signal is separated by the ISDN basic interface trunk in the electronic private branch exchange, and the D channel signal is the call control procedure information by the layer 2 service access point identifier. If it is packet communication information, if it is packet communication information, the D channel signal is converted to 64 kbps, placed on the exchange switch, returned to a 16 kbps signal by the data adapter, and sent to the packet data terminal.
There is an effect that the ISDN D channel packet data communication can be enabled by the packet data terminal accommodated in the electronic private branch exchange.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 shows an ISDN basic interface trunk according to the present embodiment, (a) is a block diagram thereof, and (b) is I.
It is a figure which shows an example of the format of the speed conversion of the D channel signal in a SDN basic interface trunk.

FIG. 3 is a system configuration diagram showing an application example of the present embodiment.

FIG. 4 is a diagram showing a control sequence in one application example shown in FIG. 3.

[Explanation of Codes] 1,1a, 1b Switch CPU (PBX CPU) 2,2a, 2b ISDN basic interface trunk (ISDN TRK) 3,3a, 3b Switch switch 4,4a, 4b Data adapter 5,5a, 5b Packet Data terminal 6 ISDN network 10 ISDN signal channel distribution device 11 Layer 2 service access point distribution device 12 D channel signal speed conversion device 13 ISDN basic interface trunk CPU
(ISDN / TRK CPU) 20 Electronic Private Branch Exchange

Claims (1)

Claim: What is claimed is: 1. An electronic private branch exchange having an ISDN basic interface connection mechanism separates a 2B + D signal from an ISDN network into two B channel signals and one D channel signal, The channel signal is transparently connected to the switch as a signal of 64 kbps, and the D channel signal is read out by the ISDN basic interface trunk CPU when the service access point identifier is 0 by the layer 2 service access point distribution device, and the service is read. Access point identifier 16
In case of 16 kb by D channel signal speed converter
I having transmission control means for converting a D channel signal of ps into a signal of 64 kbps and transmitting the signal to the switch.
An SDN basic interface trunk is provided, and a signal converted from the exchange switch to the 64 kbps signal is transmitted from the exchange switch to a packet data terminal accommodated in the electronic private branch exchange and having a D channel designated by call control information.
A data adapter for returning to a 6 kbps D channel signal for transmission to the packet data terminal is provided, and the data adapter accommodated in the electronic private branch exchange is used to
ISD of electronic private branch exchange characterized by transmitting SDN D channel packet to said packet data terminal
N D channel signal processing system.