KR20000034153A - Method for controlling path diagnosis between time switch and sub device in mobile switching center - Google Patents

Abstract

PURPOSE: A method for controlling the path diagnosis between a time switch and a sub device in the mobile switching center is provided to diagnose call processing diagnostic status in the time switch and to detect service fault initially in the sub device of a transmitting side by transmitting the result of diagnosis to the sub device of the transmitting side. CONSTITUTION: A receiving side subscriber interface(22) converts the analog signal received from a first subscriber(21) into a digital signal. A time slot control part(24) transmits the path diagnostic control data of an associated call to a diagnostic part(23). A upper level control part(27) transmits a switching control data to the time slot control part(24). A transmitting side subscriber interface(25) transmits PCM data to a second subscriber(26) line through analog conversion in normal condition and informs abnormal status to the upper level control part(27) in abnormal condition.

Description

Path diagnosis control method between time switch and lower device in exchange

The present invention relates to a path diagnosis control method between time switch lower devices in an exchange. Particularly, a path diagnosis information is performed on a lower device for each time-switched channel during call setup of the corresponding channel, so that path diagnostic information can be received from the lower device. Characterized in that it can be utilized as.

First, the time switch control structure according to the prior art will be described.

1 is a view for explaining a time switch control structure according to the prior art.

In the prior art shown in Fig. 1, the time switch 13 delays the time slot which is the input PCM data by a certain frame by the switching control data from the time slot controller 14, and as a result, the time slot which is the input PCM data is switched. Switch to timeslot of position.

In Fig. 1, the receiving subscriber interface 12 converts an analog signal received from a general switch subscriber, for example, the first subscriber 11, into a digital signal. At this time, the digital modulation method is a pulse code modulation (PCM) method and the PCM data converted by the pulse code modulation method is transmitted to the time switch 13 through a synchronization process for interworking with the time switch 13 which is a subscriber access block in the exchange. do. This PCM data is treated as a serial 64 timeslot at time switch 13.

The time switch 13 converts and multiplexes the PCM data received from the receiving subscriber interface 12 into a parallel signal in an 8 ms frame signal which is a synchronization signal in the time switch 13. Each converted time slot is sequentially stored in the time slot converting memory in the time switch 13 by frame synchronization. Time slot conversion is performed by designating and outputting arbitrary time slots among sequentially stored time slots by the switching control data received from the time slot controller 14.

The time slot controller 14 may write the switching control data corresponding to the slot conversion into the control memory in the time switch 13 and optionally test the control memory if necessary.

The transmitting subscriber interface 15 is time slot-converted and analog-converts the PCM data transmitted from the time switch 13 in synchronization with a synchronous signal, and transmits it to the second subscriber 16 line.

In the prior art shown in Fig. 1, the analog signal transmitted from the first subscriber 11 is digitally converted at a sampling rate of 8 kHz at the receiving subscriber interface 12. At this time, in the pulse code modulation method used as the digital conversion method, the PCM configuration digit is currently composed of 8 digits, and the analog signal is converted into a digital signal of 1 byte once every 8K ms. The signal converted in this way is called PCM data in the exchange, and the maximum subscribers processed by the receiving subscriber interface 12 per frame in synchronization with the frame synchronization signal of 8 ms even during transmission to the time switch 13 ( 64 PCM) is transmitted at a serial speed of 4.096Mbps. Therefore, the PCM data transmitted to the time switch 13 is treated as a serial 64 timeslot at the time switch 13 end.

The time switch 13 performs parallel conversion and multiplexing before serially storing the serial signal in the time slot conversion memory in the time switch 13. The parallel conversion and multiplexing process is necessary to process all of the matched receivers within the same 8 ms synchronization signal since the receiver subscriber interface 12 is matched to the switch multiple and each is matched in series. This process converts timeslots, which are 1-byte PCM data, from serial to parallel, and parallelizes up to 2048 in one frame from 64 timeslots in one frame. Each parallel PCM data is sequentially stored in the memory for timeslot conversion every 8 ms.

The switching control data received from the timeslot controller 14 is stored in the control memory and then output by continuous reading. The time slot conversion is performed by applying an address to the time slot conversion memory according to the switching control data and specifying and storing the stored time slot.

The timeslot-converted parallel data is demultiplexed and serialized and transmitted to the transmitting subscriber interface 15 together with the synchronization signal.

The transmitting subscriber interface 15 converts the synchronization signal and the PCM data received from the signal bus physically interlocked with the time switch 13 and transmits the analog signal to the corresponding subscriber line in analog form.

In such a conventional time switch control structure, there is no countermeasure regarding maintenance according to call routing in matching with a lower device such as a subscriber interface. For example, when switching control is incomplete in the time switch, the physically connected sender sub-device does not perform any diagnostic process, thereby transmitting an error signal to the subscriber. There is a need for a method that can efficiently perform service to a subscriber by initially detecting a service failure state in a transmitting subordinate device such as a transmitting subscriber interface.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to enable a call processing state to be diagnosed in a time switch, and to transmit a diagnosis result to a transmitting side lower device to transmit a lower side device. In this paper, a path diagnostic control method between a time switch and a lower device in an exchange that detects a service failure at an early stage is provided.

It is still another object of the present invention to provide a path diagnostic control method between a time switch and a lower device in an exchange that can efficiently control a data flow on an ongoing call processing through a diagnostic control by a time switch to increase service reliability of the exchange. will be.

1 is a view for explaining a time switch control structure according to the prior art;

2 is a view for explaining a path diagnostic control method between a time switch and a lower device according to the present invention;

Explanation of symbols on the main parts of the drawings

11: first subscriber 12: receiving subscriber interface

13 time switch 14 time slot control unit

15: transmitting subscriber interface 16: second subscriber

21: first subscriber 22: receiving subscriber interface

23: time switch 24: time slot control unit

25: sender subscriber interface 26: second subscriber

27: upper control unit 28: diagnostic unit

In order to achieve the above object, the path diagnosis control method between the time switch and the lower device in the switch according to the present invention diagnoses the call processing state by the upper control unit of the time switch, and calculates the path diagnosis control data as the diagnosis result. Transmitting to a time switch; The time switch controls the flow of the output timeslot according to the path diagnosis control data transmitted by the above step, and passes if the call processing state is normal. If the call processing state is not normal, the corresponding time slot area is processed as a specific signal. Outputting a timeslot; And monitoring the time slot processed and output by the time switch in the step of the lower device to perform an analog conversion in case of normality, and informing the upper control unit of the time switch of the result if it is not normal. .

Hereinafter, a path diagnosis control method between a time switch and a lower device in an exchange according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view for explaining a path diagnosis control method between a time switch and a lower device according to the present invention.

The receiving subscriber interface 22 converts an analog signal received from a general switch subscriber, for example, the first subscriber 21, into a digital signal. At this time, the digital modulation method is a pulse code modulation (PCM) method and the converted PCM data is transmitted to the time switch 23 through a synchronization process for interworking with the time switch 23 which is a subscriber access block in the exchange.

The time switch 23 converts and multiplexes a time slot, which is PCM data received from the receiving subscriber interface 22, into a parallel signal in an 8 ms frame signal which is a synchronization signal in the time switch 23. Each converted time slot is sequentially stored in the time slot converting memory in the time switch 23 by frame synchronization. The time slots which are sequentially stored are designated by the time slot control unit 14, and are output by specifying any time slots stored by the stored switching control data, and the diagnostic unit 28 in the time switch 23 diagnoses the output signal. Control to transmit the diagnosed timeslot to the lower device.

The timeslot control unit 24 writes the switching control data corresponding to the slot conversion into the control memory in the time switch 23 and transmits the path diagnosis control data of the call to the diagnosis unit 23.

The upper control unit 27 transmits switching control data to the timeslot control unit 24, and also transmits path diagnosis control data which is a result of call processing diagnosis. In addition, abnormal state information such as call disconnection is transmitted and received from the transmitting subscriber interface 25 to manage the state of the advanced call.

The transmitting subscriber interface 25 performs time slot conversion to signal-process the PCM data transmitted from the time switch 23 in synchronization with a synchronous signal, monitors the received PCM data, and performs analog conversion in the normal case. (26) It transmits by a line and informs the upper control part 27 of abnormal state information, when there is an error.

As shown in FIG. 2, in the path diagnosis control method between the time switch and the lower device according to the present invention, the analog signal transmitted from the first subscriber 21 pulses at a sampling rate of 8 kHz at the receiving subscriber interface 22. Digitally converted to code modulation. At this time, the converted PCM data is continuous and does not have an 'FF' value for a predetermined time. The PCM data output from the receiving subscriber interface 22 is transmitted to the time switch 23 to undergo the time slot conversion process.

The time slot control unit 24 receives the switching control data, which is information for call processing, from the upper control unit 27 and transmits it to the time switch 23, and transmits the corresponding call to the diagnostic unit 28 of the time switch 23 at the time of transmission. Send path diagnostic control data for path diagnosis in processing.

The time switch 23 stores the switching control data received from the time slot controller 24 in the control memory, outputs the data of the control memory so that time switching is performed, and outputs the address to the PCM storage memory. In this way, the time slot-converted output PCM is transmitted to the diagnostic unit 28.

The diagnosis unit 28 receives the path diagnosis control data generated by the upper control unit 27 and passes through the time slot control unit 24 to control the flow of the timeslot switched by the control of the time slot unit.

The host controller 27 generates path diagnosis control data by allocating the diagnostic control bit to the information when the abnormality is found in the call processing diagnosis. This path diagnosis control data is transmitted to the diagnosis unit 28 via the timeslot control unit 24, and in the diagnosis unit 28 in the case of normal flow control by the corresponding diagnostic control bit of each time slot, that is, the switching connection is disconnected. If it is normal to pass the switched PCM data, and if it is diagnosed that the time slot switched by the received diagnostic control bit has gone through abnormal call processing, the corresponding time slot area is filled with 'FF' and the transmitting subscriber interface ( 25).

The transmitting-side subscriber interface 25 receives the path diagnosis control data which is the status information of the call processing received from the time switch 23 from the upper controller 27. In addition, the synchronization signal received from the time switch 23 and the switched PCM data line are monitored for 'FF' data every 8 ms in units of time slots. As a result of the monitoring, when 'FF' is continuously received over a predetermined frame unit, the PCM determines whether the call progress is normal by comparing the path diagnosis control data, which is the state information received from the upper control unit 27.

If there is a discrepancy between the status information from the upper level control unit 27 and the monitoring result of the transmitting subscriber interface 25 itself, the transmitting subscriber interface 25 immediately transmits the monitoring result to the upper controlling unit 27 to normalize the path. To take.

As described above, in the path diagnosis control method between the time switch and the lower device in the switch according to the present invention, the path control control data, which is the result of call processing diagnosis, is generated by the upper control unit of the time switch, and the call according to the path diagnosis in the time switch is performed. The flow control can be efficiently controlled and the sender lower device monitors whether the call progress is normal, and the result can be compared with the call processing diagnosis result of the upper control unit to increase the service reliability of the exchange.

Claims (3)

In the path diagnostic control method between the time switch and the lower device in the exchange, Diagnosing a call processing state by an upper control unit of the time switch, and transmitting path diagnosis control data which is a diagnosis result to the time switch; The time switch controls the flow of the output timeslot according to the path diagnosis control data transmitted by the above step, and passes if the call processing state is normal. If the call processing state is not normal, the corresponding time slot area is processed as a specific signal. Outputting a timeslot; And Monitoring the time slot processed and output by the time switch at the lower device in the lower device to perform an analog conversion in case of normality, and notifying the result to the upper control unit of the time switch if it is not normal. Path diagnosis control method between time switch and lower devices in the cabin. The method of claim 1, wherein the path diagnosis control method between the time switch and the lower device in the exchange includes: Transmitting path diagnosis control data from the upper control unit to the lower device; And And comparing the monitoring result of the lower device with the path diagnosis control data transmitted in the step. The method of claim 1, wherein the path diagnosis control method between the time switch and the lower device in the exchange includes: When the data input to the time switch is PCM data, when the time switch controls the flow of the output time slot according to the path diagnosis control data, if the call processing state is not normal, the corresponding time slot area is changed to 'FF'. Path diagnosis control method between the time switch and the lower device in the exchange, characterized in that the filling.