JPS593076B2 - Subscriber circuit scanning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an on-hook system for subscribers housed in an electronic exchange;
The present invention relates to a subscriber circuit scanning scheme for monitoring off-hook conditions and detecting changes in the condition.

One of the switching operations of an electronic exchange is an operation for knowing the status of a subscriber. The subscriber's status is taken from the subscriber circuit to a subscriber line scanning device and the subscriber's status is read. This scanning operation is performed at appropriate intervals, and the subscriber's on-hook/off-hook state is obtained as a scanning result of "0" or "l".On the other hand, the scanning result of a certain time ago is stored in the storage device. This memory information is called the last look.The current state and the previous
By comparing the results of the five scans (last look) and detecting discrepancies between the two pieces of information, changes in the subscriber's off-hook and on-hook states are detected. Conventionally, this operation has been done by the central controller using a type of compound instruction called the Search Unmatched Pattern Format (SUP) instruction, and by sending the scan order multiple times with one instruction, the processing efficiency has been improved. There is.

However, despite using these instructions, SU
Since the P command itself dedicates the central control unit, as the number of lines to be scanned increases, the load for input processing increases, which may affect the processing capacity of the system. SUMMARY OF THE INVENTION An object of the present invention is to allocate the function of detecting a change in the state of a subscriber to a separate device separated from the central control device, and to make the device independent of the operation of the central control device. It is an object of the present invention to provide a subscriber circuit scanning system which reduces the load on a central control unit and improves the processing capacity of the system by operating in a similar manner.

35 According to the present invention, when detecting a change in the status of a subscriber in the data channel device of an electronic exchange, the total number of a series of orders sent from the central processing unit to the subscriber scanning device, the group of sent orders in the main storage device, means for receiving the start address of a table storing the address at the beginning of the table and the results of scanning in the previous cycle; means for reading the order from the main memory and sending it to the scanning device; means for receiving the scanning result; and means for receiving the scanning result. and a means for displaying this in the main memory when a discrepancy is detected by comparing the results of scanning in the previous cycle on the main memory, and after the series of operations are started from the central controller. A subscriber circuit scanning system is obtained which is characterized in that it is carried out without the intervention of said central control unit.

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

FIG. 1 is a block diagram showing the main structure of an electronic exchange to which the present invention is applied. The communication path network NW accommodates subscribers SUB and trunks TRK to form a communication path. The subscriber's call is detected in the subscriber circuit LR and its status information is transmitted from the scanning device SCN to the data channel DCH via the signal reception and distribution device. In addition, the communication path drive device S
Devices such as C, relay drive device RC, and signal distribution device SD control the connection and release of the communication path upon receiving instructions from the central control device CC. Furthermore, the main memory device MM stores programs and data, processes the programs and data stored in the memory device MM, and communicates with the central control device CC that controls communication line equipment, the data channel device DCH, and the exchange. The system includes a typewriter TTY and an input/output control device (10C). Next, Figures 1 to 4
Data channel DCH in the present invention with reference to the figures
The explanation will focus on the operation.

Figure 2 shows the data channel device DCH shown in Figure 1.
FIG. 3 is a flowchart showing the scanning processing operation of the control unit of the data channel device DCH for detecting the state of a subscriber; FIG. Location and general purpose registers RO, R
2 is a diagram showing the relationship between R3 and R3. When a scanning command is issued from the central control unit CC, the command receiving section 21 receives it and activates the wandering multiplier V,22.

Further, the instruction receiving section 21 receives the register R from the central controller CC.
0, R1, R2, and R3, and registers RO, Rl. R2, R3
Store in. Here, the contents of register RO are the total number of scan orders, the contents of register R1 are the scanning device SCNOIO address, the contents of register R2 are the start address of the scan order group on main memory MM, and the contents of register R3 are the total number of scan orders on main memory MM. Indicates the start address of the last search. The scanning command from the central control unit CC is issued at regular intervals, and when the command is sent, the registers RO to R3 of the central control unit CC are
The data is set to . The control unit 22 is a memory control unit 23
The flag section at the fixed address on the main memory device MM is read out via the flag section MM, and if this value is O and the contents of the register RO are not O, scanning processing begins. At this point, the control unit 22 sends a condition code (CDC) to the central controller CC.
Therefore, after receiving the CDC, the central controller CC can execute processing in parallel with the data channel device DCH. Note that the contents of the flag section are changed to the control section 2 after the scanning process is completed.
2 is set to 1, and cleared to O by the software on the central controller CC side that receives the scan results. When the scanning process starts, the control unit 22 reads the scanning order from the main memory MM according to the contents of the register R2, activates the order transmitting unit 24, and sends the order to the scanning device at the 10 addresses indicated by the contents of R1. .

The scanning results are received by the answer data receiving section 25. The previous scan result (last look) is read by the control section 22 from the address on the main memory device MM indicated by the contents of the register R3, and the matcher 26 compares the answer data with the last look. Since the answer data and last look data include 16 subscribers at a time, the comparison is made by performing an exclusive OR. If the comparison result is O, there is no change in the state of the subscriber, and the control unit 22 increments register RO by -1, registers R2 and R3 by +1, and moves on to the next scan.

If there is no change in all scans, the contents of register RO become O, and the scan process ends. If the comparison result is not O, it is determined that there is a change and the scanning ends. At the end of scanning, the control unit 22
stores whether a change is detected, the contents of register R2 at the time of change detection, and answer data at a fixed address in the main memory.

The control unit 22 also sets the flag section on the main memory to l.
If a failure occurs during the death scanning process, the control unit 22 interrupts the process and issues an interrupt to the central control unit CC. On the other hand, the program that started the data channel device DCH then performs other processing in parallel, and periodically reads in the display of a fixed address in the main memory device MM to know when the operation of the data channel device DCH has ended, and responds to state changes. The job is executed, and the fixed address in the main memory MM is set to indicate that the job has been processed ((fixed address flag part) = O).

As explained above, the present invention improves the processing capacity of the system by providing the data channel device with the function of detecting changes in subscriber status and performing scanning processing in parallel with the operation of the central control device. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the main parts of an electronic exchange according to the present invention, FIG. 2 is a block diagram showing an embodiment of the data channel device shown in FIG. 1, and FIG.
FIG. 4 is an operational flow diagram of the data channel device for detecting a change in the state of a subscriber in the main memory, and the arrangement of the scan order and last torque on the main memory, and the general-purpose registers RO and R2.
, R3. LR: subscriber circuit, NW: communication path, SUB: subscriber, TRK: trunk, SCN: scanning device, SC・・・・・・
Communication path drive device, RC... Relay drive device, S
D...Signal distribution device, SRD...Signal reception distribution device, IOC...Input/output control device, T
T.Y. ．． ．． ．． ．． ．． Typewriter, CC...Central control unit, MM...Main memory, DCH...
. . . Data channel device, 21 . . . Command reception section, 22 . . . Control section, 23 . 25...
...Answer data receiving section, 26...Matsucha.

Claims (1)

[Claims] 1. In an electronic switching system consisting of a communication line system device, an input/output system device, and a central processing system device, the central processing system device is composed of a main storage device, a central control device, and a data channel device, and the central processing system device is The total number of a series of orders sent from the central controller to the subscriber scanning device when detecting a change in the status of a subscriber, the start address of the group of sent orders on the main memory, and the table containing the results scanned in the previous cycle. A means for receiving the start address, a means for reading the order from the main memory and sending it to the scanning device, a means for receiving the scan result, and a comparison between the scan result and the previous cycle scan result on the main memory to detect a mismatch. and means for displaying this in a main memory, and after being activated by the central controller, the subscriber circuit is scanned without the intervention of the central controller. method.