JP2646980B2 - ISDN terminal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to ISDN (Integr)
ated Service DigitalNetwork
rk) The present invention relates to a terminal device, and more particularly to an ISDN terminal device having a built-in S point connected between an ISDN network and a terminal.

[0002]

2. Description of the Related Art Conventionally, in an ISDN terminal device connected between an ISDN network and a terminal, a frame signal received from the terminal is transmitted by a TEI (Terminal E).
UI including an ID request message for requesting an ndpoint indicator (terminal function identifier) number
(Unnumbered Information) The frame signal is identified.

[0003] If the received frame signal from the terminal is a UI frame signal including an ID request message, the ISDN terminal device assigns a TEI number to the terminal,
Transmit the TEI number to the terminal.

In this case, the ISDN terminal device executes a process for preventing the terminal from double registering the TEI number. Also, ISDN terminal equipment has TE
A function of releasing the I number and a function of verifying the TEI number are also provided.

[0005] The ISDN terminal device stores and manages the TEI number assigned to the terminal in the memory and transmits a UI frame signal including an ID request message for requesting the TEI number of the terminal to the station.

[0006] When the ISDN terminal device receives the TEI number assigned from the station by the UI frame signal,
TEI number and TE of the terminal stored and managed in the memory
It is managed in association with the I number.

[0007]

The above-mentioned conventional ISD
In the N terminal device, when a UI frame signal including an ID request message is sent from a terminal, a TEI number is assigned to the terminal, and the TEI number is managed in association with the TEI number assigned by the station. Therefore, there is a problem that the load of managing the assignment of the TEI number to the terminal is large.

An object of the present invention is to provide an ISDN terminal device which can solve the above-mentioned problems and can reduce the load of TEI number assignment management for terminals.

[0009]

SUMMARY OF THE INVENTION An ISDN terminal device according to the present invention is an ISDN terminal device installed between an integrated services digital network and a terminal adapter, and assigns identification information to a frame signal from the terminal adapter. Request message discriminating means for discriminating whether or not a request message requesting the request message is included, and first transmitting means for directly transmitting a frame signal from the terminal adapter determined to include the request message to the integrated services digital network. Allocation message determining means for determining whether a frame signal from the integrated service digital network includes an allocation message instructing allocation of the identification information, and the integrated service digital network determined to include the allocation message Frame signal from Second transmission means for directly transmitting to the terminal adapter and the service at the time of power-on
Discrimination of own device in frame signal to integrated digital network
Insert and send a request message requesting information allocation
Means for performing the above operation, and the
Device indicated by the assignment message included in the
Means for storing the identification information .

[0010]

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

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, I according to one embodiment of the present invention
The SDN terminal device includes a station line side S point interface 1 connected to an ISDN network (not shown), a control circuit 2, and a terminal side connected to a plurality of terminal adapters (hereinafter, referred to as terminals) (not shown). An S point interface 3 is provided.

The control circuit 2 includes a UI frame identification unit 21 for identifying a UI frame signal including an ID request message from a terminal, and a UI frame identification unit 22 for identifying a UI frame signal including an ID assignment message from an ISDN network.
A storage unit 23 for storing the TEI number of the own device;
U24.

FIG. 2 is a flowchart showing the operation of one embodiment of the present invention. The operation of the embodiment of the present invention will be described with reference to FIGS. Here, the two terminals TE1-
51 and TE2-52 are connected, and the power of all the two terminals TE1-51 and TE2-52 is off when the ISDN terminal device is started.

First, when only the ISDN terminal device is activated and the power is turned on, the CPU 24 sends a UI frame signal including an ID request message for requesting assignment of a TEI number to the UI frame identification unit 22 and the local line side S. The data is transmitted to the ISDN network via the point interface 1 (step 31 in FIG. 2).

Thereafter, when a UI frame signal including an ID assignment message is sent from the ISDN,
24 indicates that the input frame signal is a UI from the ISDN network.
Check whether it is a frame signal (Step 3 in FIG. 2)
2). That is, the CPU 24 checks which of the UI frame identification units 21 and 22 has identified the input frame signal.

The UI frame signal is sent to the UI frame identification unit 2
2, the CPU 24 checks whether the UI frame signal is a UI frame signal to the lower terminals TE1-51 and TE2-52 (step 33 in FIG. 2). ).

In this case, since the UI frame signal is a UI frame signal including an ID assignment message from the ISDN to its own device, the CPU 24 transmits the lower terminal TE1-51,
It is determined that it is not a UI frame signal to TE2-52,
A TEI number storing process for storing the TEI number of the own device in the storage unit 23 is performed (step 34 in FIG. 2).

Next, when the lower-level terminal TE1-51 is activated and turned on, the terminal TE1-51 becomes
A UI frame signal including an ID request message for requesting a number assignment is transmitted.

When a UI frame signal including an ID request message from the terminal TE 1-51 is received by the UI frame identification unit 21 via the terminal side S point interface 3,
The PU 24 determines that the input frame signal is not a UI frame signal from the ISDN network (step 3 in FIG. 2).
2) Check whether the UI frame signal is a UI frame signal including an ID request message (step 39 in FIG. 2).

In this case, the UI frame signal is transmitted to the terminal TE1.
The CPU 24 does not perform any processing on the UI frame signal and does not perform any processing on the UI frame signal.
Then, the data is transmitted to the ISDN network via the local line side S point interface 1 (step 41 in FIG. 2).

If the frame signal received by the UI frame identification section 21 is a signal other than the UI frame signal including the ID request message, the CPU 24 analyzes the message signal of the frame signal (step 40 in FIG. 2). Then, the frame signal is transmitted to the ISDN network via the UI frame identification unit 22 and the station line side S point interface 1 (step 41 in FIG. 2).

Thereafter, the terminal TE1-51 is connected from the ISDN network.
When a UI frame signal including an ID assignment message is transmitted, the CPU 24 checks whether or not the input frame signal is a UI frame signal from the ISDN network (step 32 in FIG. 2).

When the UI frame signal is transmitted to the UI frame identification unit 2
2, the CPU 24 checks whether the UI frame signal is a UI frame signal to the lower terminals TE1-51 and TE2-52 (step 33 in FIG. 2). ).

In this case, since the UI frame signal is a UI frame signal including an ID assignment message from the ISDN to the terminals TE1-51, the CPU 24
It is determined that the received signal is a UI frame signal to the terminal 1-51, and it is checked whether the UI frame signal is a UI frame signal including an ID assignment message (step 35 in FIG. 2).

The CPU 24 determines that the UI frame signal is ID
If the UI frame signal is determined to be a UI frame signal including the assignment message, the UI frame signal is transmitted to the terminal TE1-51 via the UI frame identification unit 21 and the terminal side S point interface 3 without any processing. (FIG. 2, step 37).

If the frame signal received by the UI frame identification unit 22 is a signal other than the UI frame signal including the ID assignment message, the CPU 24 analyzes the message signal of the frame signal (step 36 in FIG. 2). , The frame signal to the UI frame identification unit 21
And the lower terminal T via the terminal side S point interface 3
E1-51, TE2-52 (Step 3 in FIG. 2)
7).

When the lower terminal TE2-52 is activated and turned on, the assignment of the TEI number to the terminal TE2-52 is performed in the same sequence as the above processing operation.

As described above, the UI frame identification units 21 and 21
ID request message or I
When it is determined that the UI frame signal includes the D assignment message, the UI frame signal is passed through the control circuit 2 and is passed through the ISDN network or the terminal TE1-51,
By transmitting to the TE2-52, the terminals TE1-51 and TE2-52 can directly set the TEI numbers assigned by the ISDN network. Therefore, it is possible to reduce the burden of managing the assignment of TEI numbers to terminals in the ISDN terminal device.

[0029]

As described above, according to the present invention, when it is determined that a request message requesting assignment of identification information is included in a frame signal from a terminal adapter, the frame signal is transmitted to the ISDN network as it is. And
When it is determined that the frame signal from the ISDN network includes an assignment message instructing the assignment of identification information, the frame signal is transmitted to the terminal adapter as it is, so that the TEI for the terminal adapter is transmitted.
There is an effect that the load of the number assignment management can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 station line side S point interface 2 control circuit 3 terminal side S point interface 21 and 22 UI frame identification unit 23 storage unit 24 CPU

Claims (1)

(57) [Claims] 1. An ISDN terminal device installed between an integrated services digital network and a terminal adapter, wherein it is determined whether a frame message from the terminal adapter includes a request message requesting assignment of identification information. Request message determining means, first transmitting means for directly transmitting a frame signal from the terminal adapter determined to include the request message to the integrated services digital network, Assignment message discriminating means for discriminating whether or not an assignment message instructing the assignment of the identification information is included, and transmitting the frame signal from the integrated services digital network determined to include the assignment message to the terminal adapter as it is. Second transmission Means and said service at power up
Identification information for own device in frame signal to integrated digital network
Insert and send a request message requesting
Means and a frame from the integrated services digital network.
Of the own device indicated by the assignment message included in the
Means for storing identification information.
DN terminal equipment.