JPH02158254A - Supervisory circuit for normal continuity of isdn exchange - Google Patents

Abstract

PURPOSE:To eliminate the need for a return test even if a failure in continuity occurs to a D channel by comparing a data pattern of unused bits among six bits of a time slot for a D channel signal sent back from a line terminating equipment with a sent data pattern by a signal device. CONSTITUTION:Data consisting of a fixed pattern is sent from the signal device as unused bits among the six bits of the time slot for the D channel signal of a multiple highway between the line terminating equipment 1 and signal device 2. Then the data pattern of the unused bits among the six bits of the time slot for the D channel signal sent back from the equipment 1 is compared with the sent data pattern. Consequently, if a failure in D channel data communication occurs, continuity can be confirmed without conducting a return test of the D channel and a trouble part is disconnected immediately.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application on Mandong) The present invention relates to the transmission of supervisory signals using a time division multiplex communication system, and more particularly to a continuity supervisory circuit between a line termination device and a signaling device of an IIDN exchange.

(Prior Art) Conventionally, continuity between a line terminating device and a signaling device of an 18DN exchange has been checked by monitoring time slots for status display from the line terminating device.

(Problem to be Solved by the Invention @) Continuity monitoring between the conventional L8DN8DN switching line termination device and the signaling device described above is performed by monitoring the status display time slot from the line termination device. Ninth, when checking the normality of the continuity of the D channel time slot, when the D channel is not in use, the D channel is looped back on the line termination equipment side according to instructions from the signaling device, and the D channel is The normality of continuity was determined by checking the transmitted and received data. Therefore, even if a continuity failure occurs during use of the D channel, there is a drawback in that it is necessary to verify it by the continuity test as described above.

The purpose of the present invention is to provide a line terminating device on an exchange side connected by a transmission path to a residential line terminating device on the Toguchi side, and a multiplexing of (2H+D) signals connected to the line terminating device.
and a signaling device that performs call processing, and carries data consisting of a fixed pattern on the 6 unused bits of the time slot for the D channel signal of the multiplex highway between the line terminating device and the signaling device. By comparing the data pattern of the 6 unused bits of the time slot for the D channel signal transmitted from the device and returned from the line termination 411 with the transmitted data pattern, the above defects are removed and the D channel is connected. An object of the present invention is to provide a continuous continuity monitoring circuit for a 91 SL)N switch, which is configured so that there is no need to perform a return test even if a defect occurs.

(Means for Solving Problem A) A continuous continuity monitoring circuit for an I5DN exchange according to the present invention is configured to include a signal position a and a line termination device.

The signaling device transmits fixed pattern data to the 6 unused bits of the D channel signal time slot of the multiplex highway to the line terminating device, and transmits the data in the D channel signal time slot returned from the line terminating device. 6
Continuity can be confirmed by comparing a fixed pattern consisting of unused bits with data consisting of a fixed pattern transmitted to a line termination device, and (2B
+D) It is used for signal multiplexing and call processing.

The line termination device has one end connected to the signaling device and the other end connected to the subscriber's premises line termination device via a transmission line, and has a fixed line consisting of 6 unused bits of the D channel signal time slot. This is to receive the pattern from the signal device, loop it back, and send it back.

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

FIG. 1 is a block diagram showing an embodiment of a continuous continuity monitoring circuit of an 15DN exchange according to the present invention. In FIG. 1, 1 is a line termination device, and 2 is a signal device.

The line terminating device 1 first selects an unused D channel time slot from the time slot transmitted from the signaling device 2.
The bit is extracted and then inserted into the unused 6 bits of the transmitting time slot whose number corresponds to the receiving time slot among the D channel time slots to be transmitted to the signal equipment fit 2.

The signaling device 2 first inserts a fixed data pattern into the unused 6 bits of the D channel time slot transmitted to the line terminating device 1, and then inserts a fixed data pattern into the unused 6 bits of the D channel time slot received from the line terminating device 1. Continuity monitoring is performed by extracting data from the six used bits and comparing the extracted data with a fixed pattern inserted into the unused bits of the transmission slot of the corresponding number.

FIG. 2 is an explanatory diagram showing the format of multiple highway and D channel time slots between line termination equipment and signaling equipment.

Signaling device t2 transmits nt of the transmit D channel time slot.
Fixed data in the unused 6 bits (nssO~59)
110011'i is inserted and transmitted to line terminating device 1.

The line termination device 1 extracts the n-th (n-0 to 59) unused 6-bit data of the received D-channel time slot, and extracts the n-th (nm) data of the transmitted D-channel time slot.

~59) (reception time slot number and transmission time slot number are the same) are inserted into the unused 6 bits.

The signal device [2 extracts unused 6-bit data of the n-th (n 0 to 59) of the received D channel time slot,
nth (r+xO~5) of transmit D channel time slot
9) Check the normality of continuity by comparing with the fixed data pattern inserted in the unused 6 bits (the receiving time slot number and the sending time slot number are the same).

One end of the line termination device 1 is connected to a subscriber's home line termination device via a transmission path, and the other end is connected to the signaling device 2. The signaling device 2 performs multiplexing of (zB+D) signals and call processing.

(Effects of the Invention) As explained above, the present invention provides
'l = Ve, 1 and the line termination device on the exchange side connected to the transmission path, and the line termination device connected to the line termination device (2B
+D) It has a signaling device that performs signal multiplexing and call processing, and consists of a fixed pattern in the 6 unused bits of the time slot for the D channel signal of the multiplex highway between the line termination device and the signaling device. By comparing the data pattern of the 6 unused bits of the time slot for the D channel signal, which is loaded with data, transmitted from the signaling device, and returned from the line termination device, and the transmitted data pattern, the D channel data communication failure is detected. In the event that a problem occurs, continuity can be confirmed without performing a turn-back test on the D channel, and the fault location can be quickly isolated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a continuous continuity monitoring circuit of an I5DN exchange according to the present invention. FIG. 2 is an explanatory diagram showing the format of multiple highway and D channel time slots between line termination equipment and signaling equipment. 1...Line termination device 2...Signal device patent applicant NEC Corporation

Claims (1)

[Claims] 6 of the time slots for the D channel signal of the multiplex highway
Data consisting of a fixed pattern is placed on the unused bits of the bits and transmitted, and the fixed pattern consisting of the 6 unused bits of the time slot for the D channel signal to be returned and the data consisting of the fixed pattern transmitted from itself. Continuity can be confirmed by comparing (2B+
D) a signaling device for signal multiplexing and call processing;
one end is connected to the signaling device, and the other end is connected to the subscriber's home line termination device via a transmission line,
An ISDN exchange characterized in that it is configured to include a line terminating device for receiving a fixed pattern consisting of 6 unused bits of the D channel signal time slot from the signaling device, and returning the fixed pattern by looping it back. Continuous continuity monitoring circuit.