JPH05175958A - Isdn terminal adaptor - Google Patents

Abstract

PURPOSE:To automatically discriminate line exchange and packet exchange so as to select any of them in the data communication utilizing an ISD network. CONSTITUTION:A D channel call control section 3 discriminates whether the exchange is line exchange or packet exchange based on setup information through a D channel at the arrival of a call from opposite station terminal equipments 12, 14, an ST bus interface section 5 and a DTE interface section 6 are selected for a speed matching section 1 or a PAD&LAP-B protocol section 2. At the arrival of a call from its own station terminal equipment, which exchange an opposite station adopts is discriminated similarly by the D channel call control section 3 based on an opposite station address. According to the discrimination, the interface sections 5, 6 are selected similarly.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an ISDN terminal adapter, and more particularly to an ISDN terminal adapter for connecting a non-ISDN standard terminal to an ISDN network.

[0002]

2. Description of the Related Art In a conventional ISDN terminal adapter of this type, setting is made in advance on the local station side depending on whether the terminal adapter of the partner station for data communication is used for circuit switching connection or packet switching connection. I need to leave. That is, data communication is performed by making and receiving a call according to the setting of the terminal adapter on the partner station side.

As described above, in the conventional ISDN terminal adapter, the terminal adapter connected to the local station terminal is connected to the terminal station connected to the terminal station depending on whether the terminal station to communicate with is using the circuit switching connection or the packet switching connection. It is necessary to change the settings and decide whether to use circuit switching or packet switching.

Therefore, when one terminal performs data communication with a partner station terminal to which a terminal adapter for circuit switching connection is connected and a partner station terminal to which a terminal adapter for packet switching connection is connected Has the drawback that it is necessary to change the setting of the terminal adapter on the local station side each time.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to enable an ISDN terminal that can automatically identify and perform setting conversion even if the partner station terminal is connected to both terminal adapters for circuit switching connection and packet switching connection. It is to provide an adapter.

[0006]

The ISDN terminal adapter according to the present invention comprises a speed matching unit for performing data communication with a partner station terminal connected to an ISDN network through a circuit switching connection, and the above I.
A processing unit having a packet processing function for performing data communication with a partner station terminal connected to the SDN network by packet switching connection and a protocol processing function which is a communication control procedure;
A bus interface unit that mediates a transmission / reception signal between the ISDN network and the speed matching unit or the processing unit, and a terminal interface that mediates a transmission / reception signal between the own station terminal and the speed matching unit or the processing unit. Section, first identifying means for identifying whether the connection is a circuit-switched connection or a packet-switched connection from the setting information for call setting transmitted by the D channel when a call is received from the partner station terminal, and a partner station address at the time of origination According to the second identification means for identifying whether the partner station is a line connection or a packet switching connection, and the speed matching of the bus interface section and the terminal interface section according to the identification results of the first and second identification means. Section or means for switching control of connection to the processing section.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. The ISDN terminal adapter 10 is for connecting the own station terminal 9, which is a non-ISDN standard terminal, to the ISDN network 15. The ISDN network 15 is connected to the other station terminal 1 via the packet switching connection terminal adapter 13.
4 (for packet switching connection), a partner station terminal 12 (for circuit switching connection) is connected via a terminal adapter 11 for circuit switching connection.

DT in ISDN terminal adapter 10
The E interface unit 6 is for interfacing with the terminal of its own station, and the S / T bus interface unit 5 is for IS.
It interfaces with the DN network 15.

The speed matching unit 1 is for performing data communication by circuit switching connection. The PAD & LAP-B protocol unit 2 is for performing data communication by a packet switching connection, and has a packet assembling and disassembling (PAD) processing function and LAPB (Link Access) according to CCITT recommendation.
Protocol Balanced) It has a protocol processing function.

The command processing unit 4 processes a command from the terminal of its own station, and the D channel call control unit 3 uses the address of the partner station included in the command issued from the command processing unit 4 so that the partner station can communicate with the line. Determine whether it is a switched connection or a packet switched connection. Further, the D channel call control unit 3 determines whether the information transmission mode of the consistency information by the D channel of the ISDN network is the circuit switching connection or the packet switching connection when the call is received from the partner station.

The information transmission mode of the consistency information is I
In the D channel of SDN communication, this is mode information included in the call setup message for call setup. By looking at this mode information, it is possible to determine whether it is a circuit switched connection or a packet switched connection.

The S / T switching unit 7 responds to the determination result of the D channel call control unit 3 by the S / T bus interface unit 5.
Is switched to the speed matching unit 1 or the PAD & LAP-B protocol unit 2. Similarly, the DTE switching unit 8 switches the DTE interface unit 6 to the speed matching unit 1 or the protocol unit 2.

When the terminal adapter 10 receives an incoming call from the partner station terminal 12 connected to the circuit switching connection terminal adapter 11 connected to the ISDN network, the ISDN
The information transmission mode of the consistency information from the network is notified to the D channel call control unit 3 by circuit switching. Upon receiving this information, the D channel call control unit 3 switches the S / T switching unit 7 and the DTE switching unit 8 to the speed matching unit 1 side, and the DTE interface unit 6 and the speed matching unit 1 and the speed matching unit 1 and S / S. The T bus interface unit 5 is connected to each.

As a result, the data from the local terminal 10 is transmitted from the S / T bus interface unit 5 to the ISDN network via the DTE interface unit 6, the DTE switching unit 8, the speed matching unit 1, and the S / T switching unit 7. , The data is transmitted to the other station terminal 12 connected to the circuit switching terminal adapter 11 connected to the ISDN network.

Terminal adapter 1 for packet switching connection
When there is an incoming call to the terminal adapter 10 from the terminal 14 of the partner station connected to 3, the information transmission mode of the consistency information from the ISDN network is notified to the D channel call control unit 3 by packet switching. As a result, the D channel call control unit 3 receives the S /
The T switching unit 7 and the DTE switching unit 8 are respectively PAD & LA
Switching to the P-B protocol unit 2 side, the DTE interface unit 6 and the PAD & LAP-B protocol unit 2
The D & LAP-B protocol unit 2 and the S / T bus interface unit 5 are connected to each other.

As a result, the data from the local station terminal 10 is transferred to the DTE interface section 6, the DTE switching section 8, P
The destination station terminal 14 which is transmitted from the S / T bus interface unit 5 to the ISDN network through the AD & LAP-B protocol unit 2 and the S / T switching unit 7 and is connected to the packet switching connection terminal adapter 13 connected to the ISDN network Data communication is carried out.

On the other hand, when a call is made from the own station terminal 10 to the other station terminal 12, the other station address 1
By inputting a command for transmission at the address of 2, the partner station address is notified to the D channel call control unit 3 via the command processing unit 4, and it is judged whether the connection is circuit-switched connection or packet-switched connection. This judgment is made by providing a table in which information on the circuit-switched connection or the packet-switched connection is stored in advance for each address and searching this table.

In the case of circuit switching, the DTE switching unit 8
And the S / T switching unit 7 are switched to the speed matching unit 1 side to connect the terminal adapter 9 and the terminal adapter 11 for circuit switching connection by circuit switching connection, and the own station terminal 10 and the partner station connected to each other. Data communication is performed with the terminal 12.

When a call is sent from the terminal 10 of the own station to the terminal 14 of the partner station, a command for origination is input at the address of the terminal 14 of the partner station as the address of the partner station, and the D channel call control section is passed through the command processing section 4. The partner station address is notified to 3, and it is judged whether the connection is circuit-switched connection or packet-switched connection. At the time of packet switching connection, the DTE switching unit 8 and the S / T switching unit 7 are respectively set to PAD & LAP-B.
Switching to the protocol section 2 side, the terminal adapter 9 and the terminal adapter 13 for packet switching connection are connected by packet switching connection, and the own terminal 10 connected to each other.
And data communication is performed between the other station terminal 14 and.

[0021]

As described above, according to the present invention, whether the terminal of the partner station is a circuit-switched connection or a packet-switched connection is determined by the address of the partner station at the time of call origination, and an information transmission mode of consistency information at the time of call termination. By automatically connecting the speed matching unit, the PAD & LAP-B protocol unit to the S / T interface unit and the DTE interface unit respectively, the own station terminal can connect the other station terminal to the circuit switching connection and the packet switching connection. In either case, you can perform data communication without any modification, select circuit-switched connection or packet-switched connection depending on the amount of data,
This has the effect that more economical data communication can be performed.

[Brief description of drawings]

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

[Explanation of symbols]

 1 speed matching unit 2 PAD & LAP-B protocol unit 3 D channel control unit 4 command processing unit 5 S / T bus interface unit 6 DTE interface unit 7 S / T switching unit 8 DTE switching unit 9 own terminal 10 ISDN terminal adapter 11 line Exchange connection terminal adapter 12,14 Opposite station terminal 13 Packet exchange connection terminal adapter 15 ISDN network

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location 8020-5K H04L 13/00 305 C

Claims (1)

[Claims] 1. A speed matching unit for performing data communication with a partner station terminal connected to an ISDN network by circuit switching connection, and for performing data communication with a partner station terminal connected to the ISDN network by packet switching connection. A packet processing function and a processing unit having a protocol processing function that is a communication control procedure, a bus interface unit that mediates a transmission / reception signal between the ISDN network and the speed matching unit or the processing unit, and the own terminal. A terminal interface unit that mediates a transmission / reception signal to / from the speed matching unit or the processing unit, and a circuit-switched connection or a packet from the setting information for call setting transmitted by the D channel when an incoming call is received from the partner station terminal. The first identification means for identifying whether the connection is a switched connection and the address of the partner station at the time of transmission are used to identify whether the partner station is a line connection or a packet switched connection. A separate second identifying means, and means for switching control of connection of the bus interface section and the terminal interface section to the speed matching section or the processing section according to the identification results of the first and second identifying means. An ISDN terminal adapter, including: