JPS5831069B2 - Kokan Houshiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching system in which signals from subscribers and trunk lines are input using a scanning device.

FIG. 1 shows an example of the configuration of an electronic exchange system.

1 in the figure indicates that the central control unit CCl2 is the primary storage device MEM;
3 is a communication path system address bus 5PAB, 4 is a communication path system answer bus SPW & 5 is a communication path system side (incorporated) device 5PC1
Reference numeral 6 indicates a subscriber line scanning device LSCN17 indicates a trunk scanning device TSCN, 8 indicates a line link network LLN, 9 indicates a trunk link network TLN, 10 indicates a trunk circuit TRK, and 11 indicates a subscriber.

CC sends LSCM, TS to spc via 5PAB according to the instructions of the program stored in MEM.
(,N When the reading instruction is sent, the reading result is sent to the CC via the 5PWB.

From the reading result of this LSCNlTSCN, CC
Calls from subscribers, calls from trunk lines, disconnection of active calls, etc.
Detects changes in various exchange operations and processes accordingly.
By executing the program according to instructions stored in the MEM, a meaningful exchange operation is realized.

Switching equipment is required to be reliable enough to perform such switching operations stably and continuously over many years, especially during abnormal overloads caused by temporary social unrest. It is expected that the system will operate stably and maximize exchange processing capacity.

In conventional electronic switching systems, even if the processing capacity of the system is exceeded, the CC side detects new switching processing requests from the scanning device, such as subscriber calls or calls from trunk lines. Following the instructions of the program stored in MEM,
C performs processing to determine whether or not it is possible to accept the exchange processing request.

Therefore, in the event of an abnormal overload, a part of the processing capacity of the judgment process (C, C) is used, and the processing capacity of the CC that can be allocated to the execution of the exchange process that should be performed is reduced.

Since the processing capacity of an electronic exchange system is often limited by the processing capacity of the CC, the exchange throughput of the electronic exchange system increases as the exchange processing request increases. When the capacity limit is exceeded, it tends to decrease, which has the disadvantage of prolonging the abnormal overload condition.

SUMMARY OF THE INVENTION An object of the present invention is to provide an exchange system that improves the drawbacks of the prior art described above and executes exchange processing with maximum processing capacity even in the event of an abnormal overload.

In the event of abnormal overload, even if subscriber calls or calls from trunk lines exceed the processing capacity of the CC, the reading results of the scanning device indicate that the calls are taken into the CC, and the processing system is not attached to these calls. Since the process of determining whether or not CC is possible is being carried out, a part of the CC's processing capacity is used there, reducing the amount of meaningful exchange processing that should originally be performed, leading to a decline in exchange processing capacity.

The present invention reduces the load on the CC and prevents a drop in exchange processing capacity by limiting the input of the scanning device that reads from the CC when abnormally overloaded.

FIG. 2 shows an embodiment in which the present invention is applied to a scanning device.

FIG. 2 shows a part of the scanning matrix circuit inside the scanning device, in which 21 is a group of terminals for inputting pulses for selecting scanning rows;
．． Reference numeral 2 indicates a group of scanning points corresponding to each scanning line, 23 indicates a group of output terminals for outputting the scanned results to the answer bus 5 of the communication path system, and 24 indicates a relay contact for controlling the output of the scanning device.

The operation of this scanning mad IJ circuit is such that, for example, when a pulse is input to the /161 terminal of the terminal group to which pulses for selecting 21 scan columns are input, one of the scan points corresponding to each of the 22 scan columns is selected. The relay contact status (Zll, 1127...11n) of the scanning point group corresponding to the /I61 scanning row is the scanning point Z1□, /V at the //61 terminal of the output terminal group of the 23 output terminal group. 2 terminals have scanning points 11□.../
f6n terminal (This is output in association with scanning point Z1n.

The signal output to the output terminal group is that if the relay at the scanning point is operating, there is no pulse signal, and if the relay is not operating, there is a pulse signal. The status of relay contacts can be identified.

Generally, when a subscriber makes a call or a call originates from a trunk line, the relay contacts at the corresponding scanning points are activated.

In case of abnormal overload, in response to exchange processing requests that exceed the exchange processing capacity of these units, 2
4 scanner output dispensing relay contacts (e.g., contact R1
), even if the scanning point relay contact (Z11~Z1
Even if the terminal o) is closed, the load can be reduced by causing the output terminal group to output a signal as if it were open.

In the example of Fig. 2, the contact R of the 24 scanning device output control relays is
Since 1 to Rm are inserted corresponding to the scanning rows, it is possible to control the load on a scanning row basis, and priority subscribers, priority lines, non-priority subscribers, and non-priority lines can be controlled on a scanning row basis. If accommodated, (for example, a priority subscriber is accommodated in 1 scan line, a non-priority subscriber is accommodated in 462 scan lines, a priority line is accommodated in /I63 scan lines, and a non-priority line is accommodated in 44 scan lines).

) It is also possible to easily reduce the load in the event of an overload and select priority or non-priority replacement processing.

Note that if a subscriber is a subscriber or a relay line whose calling is suppressed by the output side relay, there will be no sound when the call is made, and if the relay line is a relay line, the call will not start properly when the call is made.

Even in the case of conventional exchanges, the influence on subscribers and trunk lines is approximately 100,000, and does not pose any particular problem in terms of service.

According to the present invention, the reduction in exchange processing capacity during abnormal overload, which has been a problem in conventional electronic exchange systems, can be reduced by controlling the load amount within the scanning device. This also makes it possible to perform non-priority identification processing without adding a negative value to CC.

[Brief explanation of drawings]

FIG. 1 shows an example of the configuration of an electronic exchange system. FIG. 2 shows one embodiment of a scanning matrix circuit in a scanning device according to the invention. 6... Subscriber line scanning device, 7... Trunk scanning device, 21... Terminal group for inputting pulses for selecting scanning rows, 22... Scanning contact group, 23... Output terminal group, 24
... fllJ Ray contact for each scanning device output.

Claims (1)

[Claims] 1. In an exchange that receives signals from subscriber lines and trunk lines using a scanning device consisting of a multi-IJ rack array of resistors and diodes, suppressing indications such as subscriber line call origination and trunk line call origination. means is provided for each scanning row or column of the scanning device, and in the event of an overload, the suppressing means is operated in accordance with the scanning row or column to display call indications for specific subscriber groups or for specific relay line groups. A switching system characterized by suppressing call display to reduce the load during overload, and to improve the reduction in switching processing capacity of the switching equipment due to overload.