JPH01248793A - Channel assigning method for remote control exchange system - Google Patents

Abstract

PURPOSE:To contrive effective utilization of a channel by using an idle channel among control channels when all talking exclusive channels are occupied and a new talking request comes. CONSTITUTION:Five time division multiplex communication lines 31-35 having 24-channel each are provided between a master station 2 and a remote control station 1 and channels CH0-CH22 of each communication line are assigned as communication exclusive channels and a channel CH23 is assigned as the control channel sending control information with priority. When all of the communication lines 31-35 are normal, a channel CT23 of the communication lines 31, 32 is used for sending control information respectively. Moreover, 115 talking exclusive channels are prepared but if all the communication channels are busy, and of the channel CH23 of the communication lines 33-35 idle at present is assigned to the 116th talking request. Thus, the utilizing efficiency of the channel is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a channel allocation method for a remote control switching system.

[Conventional technology]

In a conventional remote control switching system, one channel of each of a plurality of time division multiplex communication lines connecting a remote station and a master station is allocated in advance as a control channel, and the channel is used as the active or redundant control channel. If a failure occurs in a communication line that is being used, the control channel is transferred to a reserved control channel of another normal communication line.

[Problem that the invention seeks to solve]

In the above-mentioned conventional switching system, the reservation control channel allocated in advance for control always becomes an empty channel when the communication line is normal, and the channel cannot be used effectively.

[Means for solving problems]

The channel allocation method of the remote control switching system of the present invention connects a master station and a remote station through a plurality of time-division multiplex communication lines, and uses one channel of each of the communication lines as a control channel for transmitting control information with priority. All channels other than the control channel are allocated as call-only channels, and when there is a new call request while all the call-only channels are occupied, an empty channel among the control channels is used for a call. This is the configuration used for.

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〔Example〕

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

Referring to FIGS. 1 and 2 showing an embodiment of the present invention, in the remote control switching system of this embodiment, the pressure between the master station 2 and the remote station 1 is divided into five time-sharing channels of 24 channels each. Multiplex communications i31 to i35 are provided, and channels CHO to CH22 of each communication line are assigned as communication-only channels, and channel CH23 is assigned as a control channel that transmits control information with priority. There is C. When all of the communication lines 31 to 35 are normal, the communication 531 and channel CH23 of the communication line 32 are used for control information transmission, respectively. In addition, the call-only channel is 115 (23X
5) If channels are prepared, but all call-dedicated channels are used, channel CT (
23 are assigned. Furthermore, if there is a failure in either the communication line 31 or the communication line 32 that is being used as the active system or the redundant system, the control channel is sequentially transferred to the control channel of the normal communication line, and this channel is used for communication. is not assigned.

A remote control switching system that performs channel allocation as described above has communications #131 to #131 to #3 between remote station l and master station 2.
5, and each station is equipped with fault monitoring circuits 4 and 5 for monitoring multiplex communication line faults such as slips, out-of-synchronization, and signal interruptions. The fault information is notified to the remote control circuit 6 and the open side 1 circuit 7 facing the remote station, respectively. Call dedicated channel information insertion/extraction circuit on each communication line 10. IIK sent. Insertion/extraction circuits 10.11 insert control information into channels designated by control circuits 6 and 7, and extract control information from the designated channels. Control information is transmitted and received between the control circuits 6 and 7 as described above, but since the high level data link control (HDLC) procedure is used as the communication procedure, the HDLC circuits 12 and 13 are involved. H
I) The LC circuit 12.13 has a data link fault monitoring function, and when a fault is detected, it is reported to the control circuit 6.7. Fault monitoring circuits 4, 5 and HDLC circuits 12.13
Control channels are allocated between the control circuits 6 and 7 depending on the line and data link failure status from the insertion/extraction circuits 10. In addition, the failure status and control channel assignment are determined by the time division network 14.
The common control circuit 15 is notified via. The common control circuit 15 has a management table for managing the use of channels on each communication line, and has a function of allocating channels to calls that occur using the method described above. Channel allocation instructions are first given to the control circuit 7, which uses the control channel (CH23) on the communication line to convey this to the control circuit 6, and the starvation circuit 6 issues connection instructions to the concentrator switch 16. Perform channel allocation as follows.

〔Effect of the invention〕

As explained above, according to the present invention, one channel of each of a plurality of time-division multiplex communication lines is allocated as a control channel for transmitting control information with priority, and all other call-only channels are occupied. When a new call request is made, channel usage efficiency can be improved by using an empty channel behind the control channel for the call.

[Brief explanation of the drawing]

1 and 2 are diagrams showing one embodiment of the present invention. 1...Remote station, 2...fitilJ1
31-35...Time division multiplex communication line, 4,5...
...Fault monitoring circuit, 6...Remote station control circuit, 7...Remote station opposing control circuit, 8, 9...
...Multiplexing/demultiplexing circuit, 10.11-----Control information insertion/extraction circuit, 12.13...-HDLC
Circuit, 14... Time division network, 15...
...Common control circuit, 16...Concentration switch. 21st! r

Claims (1)

[Claims] A master station and a remote station are connected by a plurality of time division multiplex communication lines, one channel of each of the communication lines is assigned as a control channel that transmits control information with priority, and all channels other than the control channel are used for communication. A channel of a remote control switching system, characterized in that the channel is allocated as a dedicated channel, and when a new call request is made while all of the call-dedicated channels are occupied, an idle channel among the control channels is used for a call. Assignment method.