JPS6231873B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trunk control system in a multiprocessor time division electronic switching system.

The trunk control system of a conventional electronic exchange will be explained with reference to FIG. In FIG. 1, 1 is a communication path, 2 is a trunk, 3 is a relay driving device, 4 is a signal distribution device, and 5 is a central control processor. After the trunk 2 reads the physical state of a certain line by means of its line monitoring function and a trunk scanning device (not shown) conveys the result to a single central control processor 5, the central control processor 5 receives a signal indicating this physical state. If it is determined that there is a relay, it interprets the meaning of the signal, determines the next replacement operation, issues one-by-one commands, activates the relay drive device 3 and signal distribution device 4, sends relay drive pulses, and switches the trunk 2.
It operated the necessary relays and controlled certain switching operations. The processor 5 also controls the communication path 1. Since there is only one processor, and this one processor controls all the switching equipment, the following problems arise.

(1) There is an upper limit to the processing capacity of the processor, both economically and technically.

(2) When the scale of the station is small, processor usage efficiency decreases and becomes uneconomical.

(3) The division of functions is not clear, making the software complex and making it difficult to expand functions.

(4) The amount of change required when expanding the communication line system is large.

(5) Since switch control is concentrated in one processor, failures have a large impact.

(6) Since the communication path and the driving device for the communication path are controlled on a one-to-one basis, there is a problem in terms of reliability.

On the other hand, in order to improve such problems caused by a single processor, for example, as shown in Japanese Patent Laid-Open No. 124906/1983, multiple processors with different functions are used to improve the line capacity of the exchange and the functions. A method is known that always uses the same control method regardless of the situation, and provides the optimal configuration for the requirements of the exchange. However, in this case as well, a group of trunks in which lines and communication path equipment are connected by a signal highway,
Because it is fixedly connected to the trunk processor, the following problems arose.

(1) When a traffic imbalance occurs in a group of lines accommodated in a time-division communication path, the load balance on the trunk processors cannot be equalized, and the line group may have to be reaccommodated. Lacks sex.

(2) Since the time-division communication path, trunk, and trunk processor are connected one-to-one, there is a problem in reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a trunk control method that eliminates the problems of the prior art described above, increases flexibility in trunk installation and line installation, and improves system reliability.

For this purpose, in the control method of the present invention, when a line signal is drawn into a trunk controlled by a trunk processor via a communication path device, there is no free space between the communication path device in which the line is accommodated and the trunk. The structure is such that the trunk processor can monitor and control lines accommodated in any communication path device.

FIG. 2 is a block diagram of an electronic exchange to which the trunk control system according to the present invention is applied, and one embodiment of the control system according to the present invention will be described below with reference to this diagram.

In FIG. 2, 11 to 1l are communication path devices;
Each of the devices 11 to 1l consists of a time division switch 71, a space division switch 72, and a time division switch 73. 21, 22-2m is the communication path device 11
This is a group of trunks each consisting of a plurality of trunks each having a function of monitoring up to 11 incoming/outgoing lines and transmitting/receiving signals.
This trunk group 21, 22 to 2m is connected to the communication path device 1.
1 to 1l, and by adopting a configuration in which they are arbitrarily connected using intra-office cables, the line groups accommodated in the communication path devices 11 to 1l can be configured according to the call type, call volume, station size, etc. Which trunk group 21, 22-2
The structure is such that it can be drawn in even to m. 3
Trunk processors 1 and 32 to 3m control the trunks, each of which has a scale or load distribution, and processes corresponding trunk groups 21, 22 to 2.
It is attached to m. Therefore, the communication path devices 11 to 1l and the trunk processor 31,
32-3m is also a non-compatible configuration. 41, 42-4
Reference character n is a control processor that performs connection control, service control, etc. of exchange processing, and the load is distributed in units of tasks, that is, the minimum unit of program execution for call control. 50 is the trunk processor 31,3
2~3m and control processor 41, 42~
This is a communication device that performs communication between two processors 4n via a channel bus 51, and autonomously controls data transfer between these devices and bus access contention between processors. 61 to 6l are the control processors 41, 42 to 4n to the channel bus 51,
Communication path devices 11 to 1l directly via communication device 50
This is a control line used to control communication path connection.
Further, 74 and 75 are digital highways.

When a signal is sent from the line 74, it is transmitted through the trunk groups 21, 22 to 11 through the communication path devices 11 to 1l.
It is pulled in and received at a distance of 2m. This reception result is periodically monitored by one of the plurality of trunk processors 31, 32 to 3m.
~3m is not compatible with the configuration, so which trunk processor is used for control depends on the station data (even if the method conditions are fixed, it depends on the station conditions set based on the station size, route-specific traffic volume, etc.). (data with different contents).

When a change in the signal is detected in the trunk processors 31, 32 to 3m, the physical signal is analyzed and sent to the control processor 4 via the interprocessor communication device 50 and the channel bus 51 in the form of a logical signal.
Send to 1,42-4n. The control processors 41, 42 to 4n operate in a load-distributed manner, and only one processor receives a signal at a time. The control processors 41, 42 to 4n perform connection control, service control, etc., but when performing communication path connection operations,
Direct communication path control is performed via control lines 61-6l.

When communicating from the control processors 41, 42 to 4n to the trunk processors 31, 32 to 3m, logic signals are also sent as data, and communication is carried out to the designated trunk processor via the interprocessor communication device 50 and channel bus 51. It is done. The trunk processors 31, 32-3m analyze the signals, control the trunk groups 21, 22-2m, and send the signals to the line via the communication path.

For example, if you are currently receiving an incoming call (there is a call from another station connected to the digital highway 75 to a subscriber of your own station connected to the digital highway 74, and the called party's ringing bell is ringing). When the trunk processor (for example, 31) detects a response from the called party and then communicates with the control processor to set the call status, the following operations occur.

While a call is incoming and connected, the trunk processor 31 regularly monitors the called subscriber's response, and another trunk processor (for example, 32) regularly monitors the incoming line for abandonment. When the trunk processor 31 detects a line change in the trunk in response to a caller's response, the trunk processor 31 continues monitoring for a fixed period of time to eliminate the momentary interruption (accidental line change). If it is determined that it is not a momentary interruption, the control meaning of the line (logical order for call control) is determined based on the trunk accommodation location information, the physical change in the line status, and the trunk status "ringing" before the change. response”. Therefore, trunk processor 31
Then, only the logical order "response" for call control and the trunk accommodation position information are sent to the control processor. 4, which is one of the control processors 41, 42 to 4n whose load is distributed
1, the processor 41 determines the next operation based on the received information and the call status managed by the control processor. In this example, the control processor 41 knows the next state since the call status is "ringing" and the change on the called party's side is "answer", and performs an operation to change the call status to "talking". That is, the operation of releasing the communication path for ringing to the calling side and the operation of newly connecting the communication path between the calling side (the other party's station) and the called party are sent to the communication path device 11 via the control line 61. control directly. As a result, the highways 74 and 75 are connected. And trunk processor 31
A call termination monitoring request is sent to the called party, and a request is sent to the trunk processor 32 to send a response signal to the opposite station where the calling party is accommodated, respectively, in the form of a logical order for call control and a trunk accommodation position number. The data is transmitted via the interprocessor communication device 50 and the channel bus 51.

The trunk processor 31 determines the next operation based on the trunk type (subscriber trunk) and state (calling) obtained from the received trunk accommodation location information, and the logical order "call" for call control, and determines the trunk's management status. After setting the status to "talk", regular monitoring of the trunk accommodation position is performed to prepare for the next line change.

On the other hand, the trunk processor 32 determines the trunk type (incoming trunk) obtained from the trunk accommodation position number.
The next operation is determined based on the call control logical order "talk", the trunk status is set to "talk", and the trunk sends a response signal to the other station. Waiting for the next change. This allows the calling party (the other party's station) and the called party to talk.

As described above, the present invention is a system in which trunk control is entrusted to a trunk control processor called a trunk processor, and communication between processors is performed using the minimum necessary information, thereby increasing the autonomy of the trunk processor.

As described above, the trunk control method of the present invention provides a dedicated processor for trunk control in addition to call path control, and by dividing the functions and making it intelligent, this trunk processor can be autonomously controlled from the control processor. I'm letting you do it. Further, in accordance with this, the configuration is such that the connection between each communication path device and the trunk control processor can be arbitrarily changed. Therefore, according to the present invention, (1) it is possible to reduce the burden on software by distributing exchange control and using dedicated hardware;

(2) Since trunk control and call path control are performed by separate processors, connections between lines and trunks can be changed depending on the call volume, and station scale and function expansion can be easily accommodated (building blocks). ).

(3) Processing capacity can be improved by dedicating processors to different functions.

(4) By distributing the control circuit, it is possible to improve reliability by distributing risks against failures.

(5) Since the communication path equipment and trunk control processor are configured in a non-compatible configuration, the system configuration is highly flexible, such as being able to easily handle the introduction of common line signaling systems.

There are various effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional electronic exchange system, and FIG. 2 is a block diagram of an electronic exchange system according to an embodiment of the present invention. 11~1l...Communication path device, 21, 22~2m
... Trunk group, 31, 32-3m ... Trunk processor, 41, 42-4n ... Control processor, 50 ... Inter-processor communication device, 5
1...Channel bus, 61-6l...Control line, 7
1,73 Time division switch, 72...Space division switch, 74,75...Digital highway.

Claims (1)

[Claims] 1 a group of communication path devices each accommodating a plurality of lines;
A first processor group has a trunk control function with line monitoring and signal transmission/reception functions, a second processor group has a connection control function for switching processing, and a first processor group that has a connection control function for switching processing; and an interprocessor communication device that connects the second processor group and controls data transfer between them, and signal control such as line monitoring and trunk control is autonomously executed by the processors of the first processor group. The communication path control is a multiprocessor type switching system in which the processor of the second processor group executes the communication path control, and the communication path device transmits the line signal to the trunk controlled by the processor of the first processor group. In the case of connecting the line through a trunk, the circuit is configured such that a free correspondence can be established between the communication path device in which the line is accommodated and the trunk, so that the processors of the first processor group can be accommodated in any communication path device. A trunk control system that is characterized by being able to monitor and control the lines that are used.