JPS5935220B2 - Terminal control method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a terminal control system.

For example, in the PCM30 system, audio signals of 30 channels are time-division multiplexed and transmitted over one common signal line (highway), and this audio signal is distributed to 30 terminals by a signal distribution device.

Although the sound and time signals reach each terminal in this way, in order to control the terminals from the transmitting side, it is necessary to further send necessary terminal control signals to each terminal. For this purpose, 1
One specific time slot in a frame is assigned to the terminal control signal, and the control signal for each terminal is transmitted in a 16 multiframe format. FIG. 1 is a diagram showing the structure of a frame in this case.

In the figure, F indicates one frame, and this frame F is divided into 32 time slots TSONTS81, and an 8-bit signal is inserted into each time slot. In time slots T51 to TS and 5, there are audio channels CH1 to CHI, respectively, in time slot T
S, 6 contains the terminal control signal, and the times head note T5
1｜~TS3, each audio channel CH16~
Boy C. will be assigned. Audio channels CH1 to CH3
o is distributed to the terminals T1 to T3o, respectively, at the receiving end. Note that the time slot TSo is assigned a maintenance or test signal and is not used as a voice channel. Control signals for terminals T1 to T3o are inserted into signal time slots TS16, and frame 16
time slot TS of frame 1.
, 6 are assigned a control signal for terminal T1, and the remaining 4 bits are assigned a control signal for terminal T2.

In this way, frames 2 to 15 as shown in FIG.
Control signals for terminals T, -T, and O are assigned four bits each to time slot TS16. According to this method, frames 1 to 1 except frame 0
5, a 4-bit control signal can be assigned to each terminal, and if the time length of one frame is 125 tLS, each terminal can receive a control signal every (125 μS×16 frames=) 2 mS. In this case, if the terminal is a subscriber line (telephone) interface, a 4-bit control signal is sufficient.

However, the trunk line (analog trunk) interface with other stations requires more control than the subscriber line interface, such as blocking and unblocking the trunk, so the above 4-bit control Signals may be insufficient. Conventionally, in such cases, a method has been adopted to expand the terminal control signal by allocating two channels worth of terminal control signals to one terminal and converting it into an 8-bit control signal.

However, in the conventional system described above, it is sufficient to use one audio channel even for the terminal to which two channels' worth of control signals are assigned, so the two-channel terminal system (
1 h of the 2 audio channels corresponding to the signal will not be used, and therefore 1/2 of the audio channels on the common signal line (highway) will be invalid, and the implementation efficiency will be reduced to 1/2. This resulted in a decline in production costs and was uneconomical. In the above case, the terminal control signal can be sent to each terminal every 2 mS, but it is infrequent and does not need to be rushed in time, such as the test pull-in control signal of the trunk blocking and unblocking signal line. There are also quite a few terminal control signals.

In the above system, the time slot TS16 for control signals in frame 0 is not used for terminal control signals that do not need to be rushed in time, so this time slot TS16 is used to send an 8-bit signal. , can send extended terminal control signals for one terminal.
In this way, if you send the extended terminal control signal to each of the 30 terminals, even if you send it to all terminals, each terminal will receive (
This extended terminal control signal can be received every 60 mS (2 mS x 30 =). SUMMARY OF THE INVENTION The present invention aims to eliminate the drawbacks of conventional methods and to economically enable the transmission of extended control signals to terminals without invalidating the voice channel on the common signal line (highway). shall be.

The invention will now be explained in detail with reference to the drawings. FIG. 2 is a connection configuration diagram of one embodiment of the present invention, and in the figure, HW
is the common signal line (highway), SD is the signal distribution device, T,
T2 to T3O each indicate a terminal. In the signal distribution device SD, DMPX is a signal distribution circuit, CR1 is a register, and DEC is a decoder. Since the terminals T1 to T and O have similar configurations, only one terminal T1 will be shown in detail. In the terminal T, DA is a decoder, CR2 and CR3 are registers, and an analog voice signal is output to the output terminal S of the decoder DA, and a subscriber line (telephone) or analog trunk, etc. is connected. In FIG. 2, a multi-frame format signal having the frame structure shown in FIG. 1 is input to the common signal line HW. However, in the present invention, an 8-bit extended terminal system is installed in time slot TSL6 of frame 0, which is not used in the conventional method and is vacant. A signal is inserted. As is well known, the signal input from the common signal line HW is distributed to each terminal T, ~T3O by the signal distribution circuit DMPX provided in the signal distribution device SD.
The audio signal of the time slot corresponding to the trough is distributed to the trough-compatible terminals.

In each terminal, the distributed audio signal is converted from a digital signal into a digital signal, that is, an analog audio signal by a decoder DA, and is outputted to an output terminal S. The control signal for the terminal T, as shown in FIG.
It is separated by PX and sent to the terminal T, which is dropped into register CR2 by known means and stored there. Register CR2 outputs the 4-bit information to output line L1, which is decoded by a decoder (not shown) and used as a control signal to control terminal T. The aforementioned 8-bit extended terminal control signal inserted into time slot TS,6 of frame 0, ie, a specific time slot, has a configuration as shown in FIG.

That is, the first bit B indicates whether this extended terminal control signal is valid or invalid. For example, "1" indicates valid, and "0" indicates invalid.The second to sixth 5 bits B2 to B6 are bits that designate and display one of the terminals T1 to T3O, that is, the destination terminal of this extended terminal control signal, and the 7th and 8th bits are bits that indicate the content of the extended terminal control signal. These two bits can perform four types of control.The expanded terminal control signal inserted into a specific time slot, that is, time slot TS16 of frame 0, is sent to the signal distribution device SD. Then, the signal is dropped from the common signal line HW to the register CRl by a well-known dropper (not shown) and stored there.

Here, this dropper and register CRl constitute means for receiving this signal. The data stored in this register CRl is decoded by the decoder DEC.
The decoder DEC has four output lines for each terminal T1 to T3O. That is, the 8-bit extended terminal control signal shown in FIG.
When given to the decoder DEC from Rl, if the first bit b1 is 61, this signal is valid, so the decoder DEC decodes it and specifies the signal specified by the second to sixth five bits B2 to B6. One terminal displayed (T, ~T3
For example, the four output lines leading to T1 are enabled, and the four output lines are activated in accordance with the information of the seventh and eighth bits B7 and b8 of the extended terminal control signal. Sends the output to one of the output lines. The outputs from these four output lines are received and stored in the register CR3 of the terminal T1, and the output is sent to any one of the four output lines L2 of the register CR3 in accordance with the above. Extended terminal control is executed by this output. Note that the first bit b1
If 601, this signal is invalid, so decoder D
EC does not decrypt, and for valley terminals T, ~T3O,
The output signal from decoder DEC is not sent out.

In the above, the extended terminal control signal is transmitted to all terminals T1~
As mentioned above, it takes about 60mS to send data once to T3O, but is this a terminal system that is extended to only one specific terminal? The signal can be sent once per period of the multiframe, that is, every 2 mS.

Although the present invention has been described with reference to the above-mentioned embodiment, the present invention is not limited to this and can be modified in various ways. However, various modifications are possible within the technical scope of the present invention.

Since the present invention is configured as described above, when a control signal for a terminal is transmitted in a multiframe format in time-division multiplexed signal transmission, an extended control signal for the terminal is transferred to an audio channel. It has the effect of being able to be transmitted economically without invalidating it.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a frame structure for a terminal control signal in multiframe format, FIG. 2 is a connection diagram of an embodiment of the present invention, and FIG. 3 is a configuration of an extended terminal control calm signal used in the present invention. It is a figure which shows an example. ) F...Frame, TSONTS3r...
...Time slot, CHl~CH3O...Audio channel, T, ~T3O...Terminal, SD...
...Signal distribution device, HW...Common signal line, DM
PX... Signal distribution circuit, DEC... Decoder, CRl, CR2, CR3... Lujistar,
DA...5...Decoder, S...Decoder output terminal.

Claims (1)

[Claims] 1. In a system having a signal distribution device having a signal distribution circuit for distributing time-division multiplexed audio signals and terminal control signals sent via a common signal line to a plurality of terminals to the plurality of terminals, In the signal distribution device, the audio signal and the control signal are distributed to each terminal via the signal distribution circuit, and each terminal extracts the control signal and receives the audio signal as audio via a decoder. The signal distribution device further includes terminal information to be controlled and extended control information inserted into a specific time slot in a control signal received in a multiframe format in the time division multiplexed signal. and a decoder for extracting the extracted information, decoding the extracted information, and sending the decoded terminal control signal to the terminal to be controlled, and performing extended control of the terminal by the output of the decoder. control method.