JPH0714154B2 - Time division multiplex transmission system - Google Patents

Description

The present invention relates to a line accommodation changing unit of a time division multiplexer. In particular, it relates to a switching control means for the time slot replacement table.

〔Overview〕

INDUSTRIAL APPLICABILITY The present invention, in a time division multiplex transmission method in which a time slot allocation is changed while the accommodation line is in operation to change the accommodation, by synchronizing the time slot allocation change of the opposite station, the line blockage due to the accommodation change can be prevented. This is something that can be avoided.

[Conventional technology]

Conventionally, in a time division multiplexing apparatus having a time slot allocation changing means for changing the line accommodation, switching of the time slot replacement table accompanying the time slot allocation change is performed asynchronously for each time division multiplexing apparatus. That is, a switching instruction is manually input for each station, or a switching instruction is issued from a game station.

[Problems to be solved by the invention]

In such a conventional time division multiplexer, when the time slot allocation is changed while the accommodation line is in operation and the accommodation is changed, the time slot allocation change for each station is performed asynchronously. Over the period from the start of the change of the changed time division multiplexer to the end of the change of the last changed time division multiplexer, the multiplexing time slot of the transmitting side and the demultiplexing time slot of the receiving side of each device The assignments will not match before and after the change. In other words, since the data is separated according to the time slot allocation on the receiving side, the data and control signals are output to the line different from the line number on the transmitting side. There is a drawback to be refused.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a time division multiplex transmission system capable of smoothly executing accommodation change even while the accommodation line is in operation.

[Means for solving problems]

The present invention comprises first and second stations (stations A and B) respectively connected to both ends of a high speed line for transmitting high speed data, and each of the first and second stations has a different procedure. Storing means for allocating data to be transferred to a time slot based on the procedure read from the storage means, and data arriving on the high-speed line based on the procedure read from the storage means. In the time division multiplex transmission system provided with means for extracting from the time slot, there are a plurality of the storage means in each of the first and second stations, and the first and second stations are in the plurality of storage means. Among the procedures stored in each, the control means (25) for selecting the procedure of the same content at the same time based on the clocks (26, 27) is provided.

[Work]

The time slot control procedure is stored in the storage means in addition to the one currently in use, as well as a backup one for use with additions / changes. By the control procedure, the opposite station is synchronously switched from the active station to the standby station. Therefore,
No erroneous data or control signal error occurs, and the line being operated does not disconnect.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The time division multiplexer 1 is installed in each of the A station and the B station, and is connected to each other via a high speed line 31. The low speed line connection units 11, 12, 13 are each connected to the demultiplexing unit 21, and are connected to the demultiplexing unit 21 of the opposite station via the high speed line 31. The demultiplexing unit 21 is connected to the working time slot allocation table 23 and the spare time slot allocation table 24 via the switching circuit 22. The control circuit 25 controls the contents of the working and standby time slot allocation tables 23 and 24, and controls the switching of the switching circuit 22 and the time counting circuit 27. The switching time is set from the control circuit 25 to the time setting circuit 26, the time measured by the time counting circuit 27 is compared with the set time, and when they match, a signal indicating the arrival of time is output to the control circuit 25. To do.

Next, the operation of exchanging the time slot allocation using the apparatus of this embodiment will be described. If the time division multiplexer 1 is performing the demultiplexing / separating operation in a certain line state, the high speed line 31
The time slot allocation procedure in (1) is stored in the working time slot allocation table 23 and added to the demultiplexing unit 21 via the switching circuit 22. At this time, if it is necessary to add or change, the time slot allocation procedure that accompanies the additions or changes will be displayed in the spare time slot allocation table.
Accumulated in 24. The time counting circuit 27 counts the time at each station. At the time when it becomes necessary to add or change, the replacement time of the time slot allocation table is set from the control circuit 25 to the time setting circuit 26 at each station in the same way. The time setting circuit 26 compares the count result of the time counting circuit 27 with the set time, and outputs a match signal to the control circuit 25 at the matched time. When the control circuit 25 receives the coincidence signal, it outputs a switching signal to the switching circuit 22 and switches the current time slot allocation table 23 to the spare time slot allocation table 24.

In this way, the time setting is made the same in each station and the time setting circuit 26
The time coincidence signal from each station is simultaneously output to each station, and the time slot allocation table of each station is switched at the same time.

〔The invention's effect〕

As described above, according to the present invention, the time division multiplexing apparatus is provided with the time counting means and the time setting means, outputs the time coincidence signal at the set time, and the control section uses the time slot allocation table based on the signals. , And the time slot allocation table of each station is changed at the same time, which has the effect of not blocking the line.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a system according to an embodiment of the present invention. 1 …… Time division multiplexer, 11 to 13 …… Low speed line connection, 21
...... Demultiplexing unit, 22 ...... Switching circuit, 23 ...... Current time slot allocation table, 24 ...... Spare time slot allocation table, 25 ...... Control circuit, 26 ...... Time setting circuit, 27
…… Time clock circuit, 31 …… High-speed line.

Front Page Continuation (72) Inventor Hidetoshi Shinoda 3-20-4 Nishishimbashi, Minato-ku, Tokyo NEC Engineering Co., Ltd. (72) Shinobu Kobayashi 5-7-15 Shiba, Minato-ku, Tokyo NEC Telecom System Co., Ltd.

Claims (1)

[Claims] 1. A first station and a second station (stations A and B) respectively connected to both ends of a high-speed line for transmitting high-speed data.
Each of the first and second stations comprises storage means for storing a different procedure, means for allocating data to be transferred to a time slot based on the procedure read from the storage means, and the storage means. In the time division multiplex transmission system, which comprises means for extracting data arriving on the high-speed line from a time slot based on the procedure read from the means, a plurality of storage means are provided in each of the first and second stations. Yes, the first and second stations perform the same procedure among the procedures stored in each of the plurality of storage means as a clock (2
A time division multiplex transmission system characterized by comprising a control means (25) for selecting at the same time based on 6, 27).