JPS63222561A - Self-diagnosis system for pseudo calling device - Google Patents

Abstract

PURPOSE:To improve the self-diagnosis function by providing a self-diagnosis adaptor consisting of a master clock generation circuit, a transmission frame generation circuit, a reception data detection circuit, a reception clock extraction circuit, and a loop-back circuit. CONSTITUTION:In the self-diagnosing adaptor 100, a loop-back data from an ISDN pseudo terminal adaptor 20 is detected by the reception data detection circuit 106 with a clock from the reception clock extraction circuit 104, the data phase of the reception data is converted by the loop-back circuit 120 to the phase from the master clock generation circuit 110, and the data is looped back to the pseudo terminal adaptor 20 through the transmission frame generation circuit 105. As a result, the data loop-back function is made enable even at a time then the clock system of the host equipment is not operating, hence the self-diagnosis function is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ISDN device, and particularly to a self-diagnosis method for a pseudo call device.

[Conventional technology]

The ISDN pseudo call device is a device that connects to ISDN subscriber equipment and tests the processing ability of the switching system as a pseudo terminal. Here, a general description of the ISDN pseudo call device will be described below with reference to FIGS. 3 and 4, which are examples of conventional systems.

FIG. 3 shows an overall diagram showing the connection between the ISDN pseudo call device 1 and the ISDN subscriber device 2, and the ISDN pseudo terminal adapters 20 to 2 are connected to the ISDN subscriber circuits 30 to 3n.
n is connected to this I SDN pseudo terminal adapter 20
~2n has a central processing unit (
It has a CPU 201 (hereinafter referred to as CPU) and performs call origination processing and incoming call processing. Further, the ISDN pseudo terminal adapter 20~
2n is controlled from the ISDN pseudo call device common section 10 through the common section interface circuits 40 to 4n.

The I5DN pseudo call device common unit 10 processes test commands and test results for each ISDN pseudo terminal adapter 20 to 2n.

Next, self-diagnosis of the ISDN pseudo call device 1 will be explained with reference to FIG.

Figure 4 shows the I SDN pseudo call terminal adapter 20 of Figure 3.
and ISDN subscriber circuit 30 block diagram;
An overview of the operation of the N pseudo call terminal adapter 20 is that a self-diagnosis issue request is sent from the common part interface circuit 40 to the CPU 20.
1, the CPU 201 sets the self-diagnosis selection circuit 209 to self-diagnosis mode, sends pseudo call data from the pseudo call pattern generation circuit 202, and selects the selection circuit 209.
This is a self-diagnosis method.

[Problem that the invention seeks to solve]

In order to perform the above-mentioned self-diagnosis, the host device, that is, I
Connected to SDN subscriber circuit 30 and subscriber line 6A,
In addition, it is necessary to synchronize with the basic clock CLK that is synchronized with the switching network.

In FIG. 4, in order to synchronize with the switching network, IS
The basic clock CLK from the switching network in the DN subscriber circuit 30
Accordingly, the transmission frame creation circuit 305 creates transmission frame data, and sends it from the subscriber line transmission/reception circuit 307 to the subscriber line 6A. In the I5DN pseudo-terminal adapter 20, data from the subscriber line is received by the subscriber line transmission/reception circuit 207 and sent to the slave clock generation circuit 204 and the received data detection circuit 206. The slave clock generation circuit 204 is designed to create locks required by the ISDN pseudo terminal adapter 20 from received data and supply them to various functional blocks, so in order to perform self-diagnosis, at least the clock system of the host device is operating. The disadvantage is that you have to do it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a self-diagnosis method for a pseudo call device that can eliminate the above-mentioned drawbacks and improve its self-diagnosis function.

[Means for solving problems]

The pseudo-call device with self-diagnosis function of the present invention detects return data from the I5DN pseudo-terminal adapter using the clock of the receive clock extraction circuit, and generates a master clock from the receive data phase using the return circuit. A pseudo call device has a circuit configuration that converts the phase from the circuit and loops it back to the pseudo terminal adapter through a transmission frame creation circuit.

〔Example〕

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

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a block diagram showing an embodiment of the overall configuration.

In FIG. 1, the ISDN pseudo call device 1 and the ISDN subscriber direct access equipment 12 are connected by ingress lines 6A to 6N, and the ISDN
Inside the DN pseudo call device 1, there is an I SDN pseudo call device
Pseudo call common bus 5A is sent via common part interface circuit 40 accommodated in SDN pseudo terminal adapters 20 to 2n.
connected to.

The self-diagnosis adapter 100 according to this embodiment has a data loopback function with a master clock generation circuit 110 (FIG. 2), and is connected by a selection circuit 209 (FIG. 2) in the ISDN pseudo terminal adapters 20 to 2n. ISD
It loops back data from the N pseudo terminal adapters 20 to 2n and sends out data synchronized with its master clock.

Next, the operation will be explained with reference to FIG. In order to perform a pseudo call data return test, the CPU 201 selects the selection circuit 2.
0 selection circuit 209,210.0 to set 09,210.211 to diagnostic mode. When the '2L1 is set to the diagnostic mode, frame data synchronized with the master clock generation circuit 110 in the self-diagnosis adapter 100 is sent out from the transmission frame generation circuit 105, passes through the selection circuit 211, and is sent to the slave clock generation circuit 204 and reception data detection. is supplied to circuit 206.

The slave clock generation circuit 204 synchronizes the clocks, uses the synchronized clock to perform frame detection in the received data detection circuit 206, and establishes frame synchronization using the output of the received data detection circuit 206.
00 various clocks are supplied. Next, the data from the ISDN pseudo terminal adapter 100 is sent out by the transmission frame creation circuit 205, passes through the selection circuit 210, and is sent to the reception clock extraction circuit 104 of the self-diagnosis adapter 100.
and is supplied to the received data detection circuit 106, and synchronization is established similarly to the slave clock generation circuit 204.

As described above, the ISDN pseudo terminal adapter 20
By establishing synchronization between the self-diagnosis adapter 100 and the self-diagnosis adapter 100, the data from the pseudo call pattern generation circuit 202 is returned by the selection circuit 209, or the self-diagnosis adapter 100
Allows for turnaround.

〔Effect of the invention〕

As explained above, the present invention includes a master clock generation circuit, a transmission frame generation circuit, a reception data detection circuit,
By accommodating a self-diagnosis adapter consisting of a reception clock extraction circuit and a loopback circuit in a pseudo call device, a data loopback function that was previously impossible when the host device clock system was not operating becomes possible, and the self-diagnosis function is improved. This has the effect that it is possible to improve the

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG.
Detailed block diagram of one embodiment in the overall configuration diagram in Figure 3.
The figure is an overall configuration diagram of a conventional example, and the fourth country is a detailed block diagram of an example in the overall configuration diagram of FIG. 3. 1...l5DN pseudo call device, 2...I SDN subscriber device, 10...I SDN pseudo call device common part, 20
~2n...I SDN pseudo terminal adapter, 30~3
n...I SDN subscriber circuit, 40 to 4n... Common part interface circuit, 5A, 5B, 5C, 5D, to 5
N... Pseudo call common bus, 6A, 6B, 6C, ~ 6N.
...Subscriber line, 70...Self-diagnosis bus, 100...
・Self-diagnosis adapter, [)ou↑...data output,
DIN...Data input, CLK...Basic clock,
104.304...reception clock extraction circuit, 105,
205°305... Transmission frame creation circuit, 106,
206°306... Received data detection circuit, 110...
- Master clock generation circuit, 120... Return circuit, 201... CPU <central processing unit), 202... Pseudo call pattern generation circuit, 2
03... Pseudo call pattern check circuit, 204...
Slave clock generation circuit, 207.307... Subscriber line transmission/reception circuit, 209, 210.211... Selection circuit, 220... Terminal adapter internal bus, 309.
...day 1st

Claims (1)

[Claims] In an ISDN pseudo call device, return data from a pseudo terminal adapter is detected by a reception data detection circuit in synchronization with the clock of a reception clock extraction circuit, and the return circuit converts the received data from the reception data phase to the phase from the master clock generation circuit. A self-diagnosis method for a pseudo call device, characterized in that the pseudo call device accommodates a circuit configuration that converts the frame and loops it back to the pseudo terminal adapter through a transmission frame creation circuit.