JPH03273737A - Packet communication system - Google Patents

Abstract

PURPOSE:To execute ISDN packet communication from a data terminal already housed in an electronic exchange by collectively installing terminal adapters(TA) for packet and executing the packet communication through those TA. CONSTITUTION:Data is sent from a data terminal 12 through a data terminal interface device 10, data line circuit 8, time division switch 6 and TA interface trunk 5 to a TA4 for packet and assembled to a packet. Then, the data is sent through the TA interface trunk 5, time division switch 6 and ISDN interface trunk to an ISDN network 1 or sent through the TA interface trunk 5, time division switch 6, D channel handler 3, ISDN interface trunk 2 to the ISDN network 1. In the case of data reception, the data passes through the reverse route. Thus, the packet communication can be executed from the data terminal housed in the existing data line circuit.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to ISDN (Integ'rated 5e
The present invention relates to a packet communication method using an electronic exchange connected to an electronic switching system (Rvices Digital Network).

[Conventional technology]

Conventionally, packet communication systems in electronic exchanges have been carried out as follows. That is, a packet compatible terminal adapter is installed for each data terminal, and an ISDN line circuit is installed on the electronic exchange side.

Processing is then performed by the electronic exchange main body.

[Problem to be solved by the invention]

The conventional packet communication system described above requires a packet-compatible terminal adapter to be installed for each data terminal, an ISDN line circuit on the electronic exchange side, and processing is performed in the exchange itself. Therefore, data terminals accommodated in existing data line circuits have the drawback of not being able to perform packet communications.

SUMMARY OF THE INVENTION An object of the present invention is to provide a packet communication method that eliminates such drawbacks and enables packet communication of data terminals accommodated in existing data line circuits.

[Means to solve the problem]

The present invention uses an electronic exchange connected to an ISDN network to
In the packet communication system that transmits data packets, data terminals accommodated in existing data line circuits are installed in the time division switches of electronic exchanges, and packet terminal adapters are centrally installed. It is characterized by transmitting data packets to the ISDN network via a packet terminal adapter centrally installed in a division switch.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a relay system diagram for implementing the present invention.

As shown in Figure 1, in the electronic exchange connected to the ISDN trunk, data terminals 12.13 accommodated in the existing data line circuit 8.9 and packet terminal adapters (packet TA) 4 centrally installed. The time division switch 6
means for transmitting and receiving packet call control information and data packets between the packet TA 4 and the electronic exchange; and means for connecting the ISDN network and the electronic exchange using the call control information and transmitting and receiving data packets. It is equipped.

That is, the electronic exchange is connected to the TSDN network 1 by an IS[IN interface trunk 2 and a D channel handler 3, and has a data terminal 12.13 on the extension side, a data terminal interface device 10.11, and a data line circuit 8.
, 9. Further, this electronic exchange is connected to a TA interface trunk 5 that interfaces with a packet terminal adapter 4, and is composed of a time division switch 6 that connects these line circuits and the trunk, and a central controller 7 that controls the connection. has been done.

Next, a case where the data terminal 12 makes a call will be described as an example.

The procedure for transmitting a packet from the data terminal 12 is, for example, r
A call is made by PACKET-CALLJ, and the information is sent to the central controller 7 via the data terminal interface device 10 and the data line circuit 8. The central control unit 7 recognizes the information from the data line circuit 8 as a packet call, and uses the time division switch 6 to connect the data line circuit 8 and the TA interface trunk 5 to connect the data terminal 12 and the packet TA 4. Connecting.

Next, when the data terminal 12 is operated according to the procedure of the packet terminal adapter 4, a call setting message is generated by the packet TA 4 and sent to the central controller 7 via the TA interface trunk 5. Central control device 7
uses this call setup message to determine the channel to be used for the packet.

That is, the central controller 7 sets a path between the TA interface trunk 5 and the SDN interface trunk 2 for a B channel packet, and sets a path between the T interface trunk 5 and the D channel handler 3 for a D channel packet. Set the path. At the same time, the central control device 7
sends the call setup message to the ISDN via the D channel handler 3 and the ISDN interface trunk 2.
Send to network 1.

In this way, call control information is transferred between the ISDN network 1 and the packet terminal adapter 4 through the ISDN interface trunk 2. D channel handler 3. Central control unit7.
transmitted and received via TA Vineface trunk 5,
Call setup is complete. Data is also transferred from the data terminal 12 to the data terminal interface device 10. The data is sent to the packet terminal adapter 4 via the data line circuit 82, time division switch 6, and TA interface trunk 5, and assembled into packets. And the data is
TA vane face trunk 51 time division switch 6.1
ISDN via 5IIN interface trunk
m 1 or TA interface trunk 5, time division switch 6, D channel handler 3゜IS
ISDN network 1 via DN interface trunk 2
sent to. When receiving data, the route is reversed.

In this way, this embodiment enables packet communications of data terminals housed in existing data line circuits.

〔Effect of the invention〕

As explained above, the present invention centrally installs packet terminal adapters in electronic exchanges connected to the ISDN network and performs packet communications via them, thereby eliminating the need for ISDN packets that were previously installed for each data terminal. This has the effect of reducing the number of compatible terminal adapters, realizing TSDN packet communication from data terminals already accommodated in the electronic exchange, and reducing the load on the electronic exchange itself.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram for implementing the present invention. l...TSDN network 2...ISDN interface trunk 3...
...D channel handler 4...To T for bucket 5...TA interface trunk 6...
Time division switch 7...Central control unit 8.9...Data line circuits 10, 11...Data terminal interface device 12,
13...Data terminal

Claims (1)

[Claims] (1) In a packet communication method that transmits data packets using an electronic exchange connected to the ISDN network, a data terminal accommodated in the existing data line circuit is installed in the time division switch of the electronic exchange, and a packet terminal is installed in the time division switch of the electronic exchange. A packet communication method characterized in that adapters are centrally installed and data terminals transmit data packets to an ISDN network via packet terminal adapters centrally installed in time division switches.