JPH01120993A - User network interface system for isdn terminal equipment - Google Patents

Abstract

PURPOSE:To monitor a D-channel data of a user network interface and to attain diagnosis of layer circuits 1, 2 of an ISDN terminal equipment by providing a switching circuit so as to select the reception of a D echo channel and a D channel sent from a network terminator to an ISDN terminal equipment and using the D echo channel bit as a reception data of the layer 2 circuit. CONSTITUTION:A layer 1 circuit SINF 1 is connected to a subscriber bus 2 and a transmission/reception data of an ISDN user network interface is multiplexed and demultiplexed into two 64kbps B channel data B1, B2 and a 16kbps D channel data D. The B channel data B1, B2 are transmitted and received among the SINF 1, a telephone set via a voice circuit ALC CODEC 3, a data circuit DLC.RA and a data terminal equipment. Then the D-channel data D is transmitted/received between the SINF 1 and the layer 2 circuit LAP-D5. That is, since the data sent by the LAP-D of the title terminal equipment is received by its own equipment, the normality of the layer 1, 2 circuits is diagnosed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a user network interface method for an ISDN terminal, and in particular, a method for connecting to a user network interface that adapts to reference points S and T of the basic interface structure of ISDN. The present invention relates to a user network interface system for an 15DNfi terminal that diagnoses layer 1 (physical layer) and layer 2 (link layer) circuits of an 15DNi terminal and an 15DN terminal adapter device, and monitors D channel data of the user network interface.

[Conventional technology]

FIG. 3 is a block diagram showing an example of a home bus interface of a conventional ISDN terminal.

Conventionally, this type of ISDN terminal equipment is connected to the home bus 2 of the user network interface, as shown in FIG.
Data to be transmitted and received is transmitted and received by layer 1 circuit (gINF) 1 into two B channel (64kbps) data B1. B
2 and the D channel of layer 2 (LAFI-D) circuit 5 (
64 kbps) is separated and multiplexed into data D. Also, D included in the data received from the domestic bus 2 to the ISDN terminal.
The echo channel (Dε) is used for transmission competition and priority control from a plurality of terminals connected to the home bus 2.

[Problem that the invention seeks to solve]

FIG. 2(a) is a connection configuration diagram of a network control device and a plurality of ISDN terminals connected to a user network interface adapted to reference points S and T of the basic interface configuration of ISDN.

The above-mentioned conventional multiple 15DNfS terminals (hereinafter TE1 to T
As shown in FIG.
Data structure (D) on the home bus transmission line 22 to NT3
From 0 to TE11! Since the data frame structure is different from the data structure (D+DE) on the home bus reception line 21 of
There was a drawback that the transmitting and receiving functions of the SrNF) 1 and the layer 2 circuit (LAP-D) 5 could not be easily diagnosed.

[Means for solving problems]

The user network interface method of the TSDN f41 end of the present invention is based on the reference point S of the basic interface structure of the I5DN,
IS connected to a user network interface adapted to T
In the DN terminal and ISDN terminal adapter device,
It is equipped with a switching circuit capable of selectively switching reception of the D echo channel and the D channel sent from the network terminal equipment to the ISDN terminal, and by using the D echo channel bit as received data of the layer 2 circuit, the layer of the I5DNi terminal 1 circuit and the layer 2 circuit, and monitors D channel data of the user network interface.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 12 is a block diagram of an ISDN terminal or ISDN terminal adapter device showing one embodiment of the present invention. Layer 1 circuit (SINF>1 is connected to domestic bus 2 and I
Transmission and reception data of the SDN user network interface is divided into two 64kbps B channel data B, B2 and 16kb.
It is demultiplexed into psD channel data D. B channel data B, , B2 is transmitted through a layer 1 circuit (hereinafter referred to as 5INF) 1 and an audio circuit (hereinafter referred to as ALC-C0DEC) 3. D channel data D is sent and received between the telephone and data terminal via a data circuit (hereinafter referred to as DLq-RA), and D channel data D is transmitted between 5INFI and layer 2.
It is transmitted and received between the circuit (hereinafter referred to as LAP-D) 5. The microprocessor unit (hereinafter referred to as CPU) 6 operates according to the operation mode of the man-machine interface unit (hereinafter referred to as MMI) 8.
C-C0DEC3゜DLC-RA4 and LAP-D5
Controls the control of

Here, in this embodiment, 5INFI is B channel data B, , B2 . In addition to D channel data D, further D
The echo channel DE bit signal is used at 5INFI for transmission contention and priority control to the home bus 2, and the L
Output it so that it can be received by AP-D5, and LAP-D5
A selection circuit (
Hereinafter, the configuration can be switched by 5EL) 7.

〔Effect of the invention〕

As explained above, the present invention is a network terminal device (NT).
In addition to using the D echo channel (D5) bit returned from the terminal device (TE) for contention and priority control in the layer 1 circuit (SINF), the received D channel data (D) and D By switching the echo channel (Do) data to receive data for the layer 2 circuit (LAP-D), the layer 2 circuit (LAP-D) of this terminal device
Since the data transmitted by -D) can be received by the own device, the normality of the layer 1 circuit and layer 2@J path can be diagnosed. Additionally, since the received D channel data and D echo channel data are switched, the layer 2 circuit (LAP-D) can monitor the received data or transmitted data of other ISDN terminals (TE) connected to the home bus. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an I SDN terminal or I SDN terminal adapter device showing one embodiment of the present invention, and FIG.
A plurality of interfaces connected to user network interfaces adapted to the reference points S and T of the basic interface configuration of SDN.
FIG. 3 is a block diagram showing an example of a home bus interface of a conventional ISDN terminal device. 1... Layer 1 (physical layer) circuit (SINF) 2.
・Internal bus, 3 ・Audio circuit (ALC-C0DEC
), 4... Data circuit (DLC-RA), 5... Layer 2 (link layer) circuit (LAP-D), 6... Pa.
Microprocessor section (CPU), 7... selection circuit (
SEL), 8...Man-machine interface section (M
MI), 11... I SDN terminal or I SDN terminal adapter device (TE/TA), 21... Domestic bus reception line, 22... Domestic bus transmission line, 30... Network termination device Z (NT ), 31...User network interface diagram

Claims (1)

[Claims] In ISDN terminals and ISDN terminal adapter devices connected to user network interfaces that apply to reference points S and T of the basic interface structure of ISDN, selectively switch reception of the D echo channel and the D channel sent from the network termination device to the ISDN terminal. By using the D echo channel bit as received data of the layer 2 circuit, diagnosis of the layer 1 circuit and the layer 2 circuit of the ISDN terminal and monitoring of the D channel data of the user network interface are possible. A user network interface method for an ISDN terminal, characterized in that: