JPH03165638A - Time slot assignment system for time division multiplexer - Google Patents

Abstract

PURPOSE:To quicken the transmission speed of control information to be sent between time division multiplexers by selecting a time slot assignment means with lots of time slots for control path assigned much thereto when the quantity of control information transmission between the time division multiplexers is high. CONSTITUTION:Each time division multiplexer 1 is provided with a current time slot assignment table 23 for normal time slot assignment and a standby time slot assignment table 24 for quickening the control path. The time division multiplexer 1 applies time division multiplex with time slot assignment according to the current time slot assignment table 23 to attain multiplex and demultiplex. When lots of control information exists at initializing or the like, after a switching command of time slot assignment is informed to an opposite time division multiplexer 1, the standby time slot assignment table 24 is selected. Thus, the control path transmission speed when lots of control information is required for transmission is quickened and the efficiency of the time division multiplexer at normal state is not reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to switching control of time slot allocation associated with information transmission between time division multiplexers.

〔overview〕

The present invention provides a time slot allocation method between time division multiplexing devices in which the time slot allocation can be variably set according to the amount of control information generated, thereby speeding up the transmission of control information and improving time division multiplexing. This improves the multiplexing efficiency of the device.

[Conventional technology]

Conventionally, information transmission between time division multiplexing apparatuses and control information for controlling opposing time division multiplexing apparatuses have been transmitted over control paths. The time slot allocation on the high-speed line for this control bus is fixed because the transmission speed of the control bus is set to be fixed.

Further, even for information such as voice and data on the low-speed line that is multiplexed and demultiplexed by this time division multiplexing device, time slots are fixedly allocated in accordance with the line speed.

[Problem that the invention seeks to solve]

In this way, in conventional time division multiplexing equipment, the speed of the low-speed voice or data line to be multiplexed and the control path for control information between the time division multiplexing equipment are uniquely and fixedly allocated to time slots corresponding to the transmission speed. Therefore, when there is a large amount of control information to be transmitted between time division multiplexing devices, such as when initializing or changing the number of accommodated devices, there is a drawback that it takes a long time to transmit the control information. Ta.

In addition, in order to shorten this transmission time, if the transmission speed for the control path is increased and the time slot allocation is increased,
This in turn reduces the number of voice or data time slots accommodated on the low-speed line, reducing the efficiency of time division multiplexing.

The present invention solves the above-mentioned drawbacks, and at the time of initialization etc.
An object of the present invention is to provide a time slot allocation method for a time division multiplexing device that increases the transmission speed of a control path when a large amount of control information needs to be transmitted and does not reduce the efficiency of time division multiplexing in normal times.

[Means for solving problems]

In the present invention, opposing first and second time division multiplexers are connected via a high-speed transmission line, and the first and second time division multiplexers each receive information from a low-speed line and control their own devices. Multiplexing and demultiplexing means that multiplexes information in time slot allocation and transmits it to the opposing time division multiplexing device, and also demultiplexes the time division multiplexed signal from the opposing time division multiplexing device into information for the low-speed line and control information, respectively. and a time slot allocation table storing a time slot allocation procedure given to the multiplexing and demultiplexing means, in which the first and second time division multiplexers are , comprising a plurality of time slot allocation tables, a switching means for selectively switching the plurality of time slot allocation tables and providing the plurality of time slot allocation tables to the multiplexing and demultiplexing means, and a control means for controlling the switching means, the control means , means for operating the switching means after notifying the opposing time division multiplexing device of the time slot allocation switching instruction included in the control information; and a time slot allocation switching notification in the control information from the opposing time division multiplexing device. and means for detecting the switching means to operate the switching means.

Preferably, the control means includes means for blocking a part of the voice line by sending a blockage signal to the low-speed line when switching the time slot allocation table.

[Effect]

The opposing time division multiplexing devices each perform time division multiplexing and demultiplexing to communicate.

Here, each time division multiplexing device includes a working time slot allocation table for normal time slot allocation and a spare time slot allocation table for speeding up the control path. In normal times, time slots are allocated according to the current time slot allocation table, time division multiplexed, and demultiplexed.

When changing the time slot allocation when there is a large amount of control information, such as during initialization, the time slot allocation switching instruction is notified to the opposing time division multiplexing device, and then the backup time slot allocation table is updated. Switch. The opposing station detects the time slot allocation switching instruction notification and performs switching and demultiplexing to the backup time slot allocation table.

Furthermore, when using the backup time slot allocation table, it is preferable to block part of the low-speed line and send a busy signal.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a time slot allocation method for a time division multiplexing apparatus according to the present invention.

The time division multiplexing device 1 is installed at the first station A and the second station, and is connected to each other through a high-speed line 31. The low-speed line connections 11, 12, and 13 of each time division multiplexer l are connected to a multiplexing/demultiplexing unit 21, respectively.

The multiplexing/demultiplexing unit 21 is connected to the multiplexing/demultiplexing unit 21 of the opposite station via a high-speed line 31.

The multiplexing and demultiplexing section 21 is connected to a working time slot allocation table 23 and a backup time slot allocation table 24 via a switching circuit 22. The control circuit 25 controls the contents of the working time slot allocation table 23 and the backup time slot allocation table 24, and also performs switching control of the switching circuit 22. Further, the control circuit 25 is connected to the multiplexing and demultiplexing section 21 to transmit control information to the opposite station, and also receives control information from the opposite station manually.

The operating section 28 is connected to the control circuit 25 via the human output section 26, and is connected to the operating section 28 of the opposite station A via the multiplexing and demultiplexing section 21.
connected to. Further, the storage memory 27 is connected to the control circuit 25 and stores information on the operation section 28 of the own station or the opposite station.

Next, the operation of changing the control path time slot allocation using this embodiment device will be explained.

Low-speed line connection section 11 in line state with time division multiplexer 1
．． 12.13 and control circuit 25 data, audio information,
When time division multiplexing/demultiplexing is performed on control information, the time slot allocation procedure on the high-speed line 31 is stored in the current time slot allocation table 23. Therefore, the control circuit controls the switching circuit 22 to
The time slot allocation procedure of this current time slot allocation table 23 is given to the multiplexing/demultiplexing section 21 to perform multiplexing and demultiplexing.

At this time, if it becomes necessary to transmit a large amount of information between the operating units 28, or if it becomes necessary to transmit a large amount of information from the operating unit 28 to the storage memory 27 of the opposite station, the control path is Need to increase speed.

The time slot allocation procedure for increasing the speed of this control path is stored in the backup time slot allocation table 24. Therefore, when it becomes necessary to transmit a large amount of control information, the control circuit 25 transmits a switching instruction to the control circuit 25 of the opposite station via the control path.

Then, it controls the switching circuit 22 on its own side to switch from the working time slot allocation table 23 to the backup time slot allocation table 24, and provides the time slot allocation procedure to the multiplexing and demultiplexing section 21. The switching instruction from the control circuit 25 of the opposite station is separated from the multiplexed signal by the multiplexing and demultiplexing section 21, and after the instruction content is confirmed by the control circuit 25,
The switching circuit 22 is caused to switch from the working time slot allocation table 23 to the backup time slot allocation table 24. As a result, the multiplexing and demultiplexing section 21 multiplexes the low-speed signals and demultiplexes the multiplexed signals according to the time slot allocation procedure stored in the backup time slot allocation table 24.

At this time, the control circuit 25 controls the low-speed line connections 11 to 13.
A busy tone, which is a blocking signal, is sent to each line from the voice line to partially block the voice line. As a result, the operation section 28
When the amount of information transmitted between each other is large, the low-speed line connection section 11
It is possible to give priority to short-term information transmission between the operation units 28 even if the transmission of information in 13 to 13 is slightly sacrificed.

When the amount of information transmitted between the operating units 28 of each station decreases, the backup time slot allocation table 24 is returned to the current time slot allocation table 23. The operation at this time is similar to that described above, in which a switching instruction is notified to the opposite station and the switching is performed.

〔Effect of the invention〕

In this way, when the amount of control information transmitted between time division multiplexing devices is large, the present invention switches to a time slot allocation means that allocates a large number of time slots for control paths. The transmission speed of the control information to be transmitted can be increased, and when there is little control information, the time slot allocation can be returned to the normal time slot allocation, reducing the constant multiplexing efficiency. It has the effect of not letting you down.

[Brief explanation of the drawing]

The figure is a block configuration diagram showing the configuration of the system according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Time division multiplexing device, 11-13... Low-speed line connection part, 21... Multiplexing separation part, 22... Switching circuit,
23... Current time slot allocation table, 24...
- Spare time slot allocation table, 25... control circuit, 26... human output section, 27... storage memory, 2
8...Operation unit, 31...High speed line.

Claims (1)

[Claims] 1. Opposing first and second time division multiplexers are connected via a high-speed transmission line, and the first and second time division multiplexers receive information from the low-speed line and It multiplexes the control information of its own device using time slot allocation and transmits it to the opposing time division multiplexer, and also demultiplexes the time division multiplexed signals from the opposing time division multiplexer into information for the low-speed line and control information, respectively. In a time slot allocation method of a time division multiplexing device comprising a multiplexing/demultiplexing means and a time slot allocation table storing a time slot allocation procedure given to the multiplexing/demultiplexing means, the first and second times described above are provided. The division multiplexing device includes a plurality of time slot allocation tables, a switching means for selectively switching the plurality of time slot allocation tables and applying the selected table to the multiplexing and demultiplexing means, and a control means for controlling the switching means, The control means includes means for operating the switching means after notifying the opposing time division multiplexing device of the time slot allocation switching instruction by including it in the control information; 1. A time slot allocation method for a time division multiplexing device, comprising means for detecting a slot allocation switching notification and operating the switching means. 2. The time slot allocation method for a time division multiplexing apparatus according to claim 1, wherein the control means includes means for blocking a part of the voice line by sending a blockage signal to the low-speed line when switching the time slot allocation table. .