JPS59117895A - Resetting system of subscriber/trunk circuit - Google Patents

Abstract

PURPOSE:To prevent malfunction of a subscriber/trunk circuit by checking the receiving of a specific pattern at the shelf side in a time division exchange so as to attain the resetting of the subscriber/trunk circuit automatically in a short time. CONSTITUTION:When a specific pattern B in a memory SSM for transmission in an exchange network is transmitted to a shelf accommodating a subscriber/ trunk circuit periodically, the specific pattern B is detected by a shelf common section COM and the pattern is compared with the key pattern of a register REG. When the result of this comparison is coincident, a pulse is transmitted to a monostable multivibrator MV so as to suppress an output signal A for a time decided by a time constant. If a failure occurs on a transmission line and continues for more than the time decided by the time constant time, the signal A is outputted, and inputted to the reset terminal (a) of the subscriber/trunk circuits L/T1-L/Tn so as to prevent automatically the malfunction of the circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field of the invention The present invention provides a method for transmitting and receiving voice data, etc. and control signals to subscriber circuits (or trunk circuits) etc. to/from the same transmission path in a time-division exchange that is controlled to transmit and receive them. This invention relates in particular to a method for resetting package groups such as subscriber circuits and trunk circuits.

(2) Prior art and problems Conventionally, failures in the transmission path between the switching network NW and the shelf housing the subscriber/trunk circuit packages can be detected by checking the integrity or checking the return signal of a specific pattern signal. However, especially when audio data and control signals are mixed on the same transmission path and are transmitted and received in a time-division manner, disturbances in the audio data and control signals due to failures in the transmission path, etc., become a problem.

In other words, this disturbance causes phenomena such as regarding the voice data as a control signal and driving the relay circuit to cause the IC circuit to malfunction. Therefore, when a failure occurs, maintenance personnel, workers, etc. have to manually reset the subscriber/trunk circuit.

(3) Purpose of the Invention In order to solve this problem, the present invention checks a specific pattern on the shelf side that accommodates the subscriber/trunk circuit, etc., and automatically connects the subscriber/trunk circuit when a failure is detected. It is an object of the present invention to provide a reset method that enables initial reset of a trunk circuit group.

(4) Structure of the Invention In order to achieve the above object, the present invention provides a time-division switching system that transmits and receives voice data and subscriber/trunk circuit control signals in a time-division manner via the same transmission path. means for periodically sending a specific pattern to the subscriber/trunk circuit side on the switching network side; and a means for receiving and determining the specific pattern sent from the switching network to a shelf common area housing the subscriber/trunk circuit. The subscriber/trunk circuit is reset when the specific pattern cannot be detected for a predetermined period of time.

(5) Examples of the invention The present invention will be explained in detail below using examples.

FIG. 1 is a block diagram illustrating the reset method of the present invention. In the figure, NW is a switching network, CC is a control device, switching network NW is a communication route memo IJSPM,
Control memo IJcM, control signal reception memo IJRS
M, sending memo IJSSM, etc. are controlled in a time-sharing manner. L/TSF is a shelf that accommodates subscriber/trunk circuits, each subscriber/trunk circuit L/T, ~L/
It consists of a shelf common part COM etc. which commonly controls the subscriber/trough 2 circuit L/T group. What are subscriber/trunk circuits and switching networks?
, down highways HW are connected as transmission paths, and audio data and the like are transmitted in predetermined time slots on each highway W. In addition, D is a separation circuit for extracting the control signal and sending it to the control device CC via the receiving memory R8M, and ■ is a separation circuit for extracting the control signal and sending it to the control device CC via the sending memory SSM. This is an insertion circuit that inserts.

Normally, control signals for relay circuits to subscriber trunk circuits T/Lr~n, monitoring request signals for call origination, disconnection, etc., are sent to the control device CC and to the time slot corresponding to the transmission memo IJSSM. A counter circuit (not shown) reads out the transmission memory SSM sequentially and inserts it into the highway HW by an insertion circuit. On the other hand, information (control signals) such as call detection and disconnection detection from the subscriber/trunk circuits LT, .about.n are inserted into time slots assigned for control and carried on the highway HW. Then, the control signal of the separation circuit Dl in the network NW is separated and the memo for reception! It is sent to the control device CC via JRSM.

The audio data is read out at random according to the contents of the communication path memo IJSPIVfl, eg, sequentially, and the control memory CM, and the time slots on the highway are replaced.

Therefore, taking such a configuration in the network NW circle into account, the present invention provides a transmission memory SSM that sends control signals to subscriber/trunk circuits with a specific pattern (bit pattern) corresponding to a predetermined time slot. A register (or memory) REG that stores B and stores the same pattern as the above specific pattern in the shelf common area COM.
, a dispersion output circuit CMP that compares the contents extracted from a predetermined time slot of the lower highway HW with the contents of the register REG, and a retriggerable monomultiplier to which the comparison result of the contents (pattern) is input. Equipped with pipe lake MV.

Therefore, a specific pattern (pilot signal) set in the transmission memory SSM in the network is periodically inserted into a predetermined time slot H of the lower highway HW and sent to the subscriber/trough two-circuit accommodation channel 7HTSF. In the shelf common part COM, this pilot signal is extracted from a predetermined time slot, and - the scatter product output circuit CMP
A comparison is made with the pattern (key pattern) stored in the iron register REGi. If the comparison results match, a pulse is output to the retriggerable mono-multipipe rake Mi. Each time the mono multi-pipe rake MV receives this pulse signal, it suppresses the output signal A for a certain period of time, that is, for a time determined by a time constant within the mono multi-pipe rake MV. If this time constant is set to 2 to 3 times the transmission period of the pilot signal, the output signal A will not be output while the normal pilot signal is being received.

Alternatively, the signal A is not output in response to a fault that occurs sporadically (pattern mismatch). However, when a failure occurs in the transmission line (highway) and the time period determined by the above time constant has elapsed, signal A is output.

By inputting this signal A to the reset terminal a of each subscriber/trunk circuit L/T, to n, malfunction of the circuit can be automatically prevented.

FIG. 2 is a time chart illustrating the relationship between the output of the -scattering product output circuit and the mono-multivibrator output signal.

When a trigger pulse is input to the mono multi-pipe rake MV, the output signal (A) is maintained for a certain period of time t.Therefore, each time a pulse signal (PT) is received from the dispersion output circuit CMP, the mono multi-pipe rake MV, 5'MV is the time t (G
) i Reset as shown, and keep the output signal (A) at, for example, H.

Therefore, if the scatter product output circuit CMP detects a mismatch and cannot find a match for more than time t, the monomultipipe lake MY
The output signal (A) changes to H-)L and outputs a reset pulse.

(6) As described in detail, according to the present invention, even if a failure occurs on the transmission path and a time slot shift or bit information inversion occurs, the subscriber/trunk circuit shelf By checking the reception of a specific pattern (pilot signal) on the side, the subscriber/trunk circuit can be automatically reset in a short period of time when a failure occurs, thereby preventing errors in the subscriber circuit or trunk circuit due to failure. It is possible to prevent this from happening.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention to explain the reset method, and FIG. 2 is a time chart to explain the reset signal. SSM control pond sending memory, B2 specific pattern, REG: register (or memory) that stores the key pattern, CMP2 match detection circuit, Mv: retriggerable mono multi-pie break function.

Claims (1)

[Claims] In a time-division exchange that transmits and receives voice data and subscriber/trunk circuit control signals in a time-division manner via the same transmission path, means for periodically sending a specific pattern from the switching network side to the subscriber/trunk circuit side. and said subscriber/
The shelf common part ζ containing trunk circuits is provided with means for receiving and determining a specific pattern sent from the switching network, and for resetting the subscriber/trunk circuit when the specific pattern cannot be detected for a predetermined period of time. Features subscriber/trunk circuit reset method.