JPS6315782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Description of the field to which the invention pertains The present invention relates to a remote monitoring and meeting device provided in a digital communication system. In particular, the present invention relates to a distant monitoring meeting circuit that superimposes a plurality of pieces of distant monitoring meeting information on a main signal in a time-division manner.

(2) Description of conventional technology Remote monitoring meeting information is information that is transmitted between both end stations of a main signal transmission line that transmits large amounts of information as data necessary for maintenance personnel and telephone calls. Conventionally, the signal has been transmitted using an intervening core wire or a small-capacity communication path attached to the main signal transmission path. In addition, as a method for superimposing remote monitoring meeting information on the main signal in a time-sharing manner without requiring an intervening fiber cable,
ΔM modulation was considered. A detailed description of this can be found in Reference (1) Sato et al.: "Practical Application of PCM-400M Terminal Repeater Equipment," Tsuken Jitsugho 25-1, 1976. However, although ΔM modulation simplifies the circuit configuration, it does not provide synchronization, so distant monitoring meeting information can only be transmitted through one channel, and this method has the disadvantage that it is not possible to construct a multi-channel long-distance monitoring meeting circuit.

In particular, in the submarine optical fiber communication system, it is difficult to install a large number of effective intervening fiber cables in parallel to the optical fiber cable, and it is desired to provide multiple channels of distant meeting information superimposed on the main signal. Moreover, because terminal equipment for transmitting main signals has become significantly smaller due to circuit integration, it is unreasonable to design long-distance meeting equipment in a large size, and simple and small equipment is desirable. It was rare.

(3) Purpose of the present invention The present invention was made against this background, and it is possible to superimpose remote monitoring meeting information on several channels by superimposing it on the main signal, without providing an intervening pair in the main signal transmission path. It is an object of the present invention to provide a remote monitoring meeting device that can transmit data and has a simple device configuration.

(4) Features of the present invention The device of the present invention converts the remote meeting information for each channel into an 8-bit 64 kb/s PCM code using a general-purpose LSI code decoder, By dividing the clock, each channel is delayed by 8 bits (N+1)×
Generating a 64kHz clock pulse and an 8kHz time slot designation pulse, performing multiplex conversion and demultiplexing using wired OR, and converting the transmission speed in the transmitter and receiver of the main signal end station repeater. The present invention is characterized by inserting and separating this remote monitoring meeting information into a signal frame.

(5) Explanation with examples A detailed explanation will be given below with reference to the drawings of the embodiments.

FIG. 1 is an overall conceptual diagram of an apparatus according to an embodiment of the present invention. This figure shows the main parts of one end station of a digital transmission path. The main signal for transmission is input from terminal Sin, and the transmission signal speed converter
SCV(S) is used as a high-speed PCM signal (in this example
400Mb/S) and sent from the output terminal L _S to the transmission line. On the other hand, the high-speed PCM signal received from the transmission path is applied to the input terminal L _R , and is speed-converted by the receiving speed converter SCV (R).
It is sent to terminal R _put as the main signal output for reception.

In Figure 1, SVE is a remote monitoring meeting device,
This is a device according to the present invention. This device is combined with the speed converters SCV(S) and SCV(R), and N
Channels' remote meeting monitoring information CH1 to CHN are multiplexed or separated into the main signal.

FIG. 2 is a block diagram of a remote monitoring and meeting device according to the present invention. The N-channel distant meeting monitoring information CH1 to CHN each have a transmitting terminal S and a receiving terminal R, and are connected to an encoder COD and a decoder DEC, respectively. The encoder COD and decoder DEC encode the telephone voice signal and the 8-bit
It performs mutual conversion with 64kb/S PCM code, and is a general-purpose LSI circuit integrated into one.
This is the first feature of the present invention. A detailed description of this circuit is available in the literature (2) Iwata et al.: “Single channel LSI
"Design of CODEC", Tsuken Jippou 30-2, 1981.
This general-purpose circuit is small and inexpensive.

The output of this encoder COD is multiplexed for each channel by a multiplex converter MUX, and is sent as a signal TEL to the speed converter (SCV(S) in FIG. 1). On the other hand, the receiving side speed converter (first
The signal TEL obtained from FIG.

The second feature of the present invention is that the multiplex converter MUX and demultiplexer DMX are realized by wired OR circuits. The wired OR circuit has an extremely simple configuration, and is small and inexpensive.

Furthermore, the third feature of the present invention is that the encoder COD
and a method for extracting clock signals and synchronization signals to be supplied to the decoder DEC. That is, each encoder
A clock signal CLK(S) is commonly applied to the CCD from the transmitting side clock controller CC(S), and a clock signal CLK(S) is commonly applied to each decoder DEC from the receiving side clock controller CC(R).
A clock signal CLK(R) is commonly applied. These clock signals are characterized in that they are generated by frequency-dividing the pulse FPL for configuring the main signal frame in each clock control section. The number of channels is N
Then, this clock signal CLK(S) and
The speed of CLK (R) is (N+1) x 64 kHz. One channel is dedicated to adding frame sync pulses.

Also, the synchronization signals SYN(S) and SYN(R) are
In this example, both are 8 kHz, and in order to specify a time slot for each channel, a delay of 8 bits for one channel is sequentially applied to each channel. This original signal is also created by frequency-dividing the pulse FPL for configuring the main signal frame.
An example of this configuration is shown in FIG. DIV is the frequency divider,
DLY is a delay circuit for 8 bits.

This third feature allows clock signals and synchronization signals to be obtained without the need for special oscillators.
The output of the encoder COD and the input of the decoder DEC can be configured by a simple wired OR.

In Figure 2, the multiple conversion section using this wiring logical sum
A frame synchronization pulse pattern generation circuit FPG synchronizes with a signal obtained from inside the clock control unit CC(S) in order to provide the gate signal to MUX.
Equipped with. Also on the receiving side, a frame synchronization circuit FSY is provided which synchronizes with the signal obtained from the clock control section CC(R) in order to provide a gate signal to the multiplexing/demultiplexing section DMX using wired OR. These generation circuit FPG or synchronization circuit FSY can be simply constructed using a general-purpose integrated circuit.

FIG. 4 is a diagram showing the structure of a signal frame according to this embodiment. This signal is the signal frame of terminal L _S or L _R in FIG. One frame consists of 508 bits, where F is a frame synchronization pulse (alternating "1" and "0"), TEL is remote monitoring meeting information, I is the main signal (5th order group signal), and P is the parity check bit. , R-LTE each indicates a game alert.

If this remote monitoring meeting information TEL, which appears once every 508 bits, is arranged over 32 consecutive bits, the configuration shown in FIG. 5 will be obtained. Frame synchronization pulse F and each channel (CH1 to CH3) are
Both have an 8-bit configuration.

(6) Description of effects As described above, according to the present invention, remote monitoring meeting information can be transmitted through several channels by being superimposed on the main signal, and employs the use of general-purpose LSI, clock frequency division, and wired OR. This greatly simplifies and downsizes the device configuration.

If the present invention is applied to a digital transmission method such as an optical fiber cable transmission method, it is possible to transmit multiple pieces of distant monitoring meeting information by time-sharing the main signal without the need for intervening fiber cables. It has the advantage of being smaller in diameter and more economical. Furthermore, since multi-channel long-distance meeting lines can be easily configured, this system has the advantage of providing flexibility in the maintenance and operation of the system.

Furthermore, if the present invention is applied to a submarine optical fiber cable transmission system, there will be no need for long-distance intervening fiber cables, resulting in significant economic savings. This has the advantage of increasing reliability by reducing the number of parts. In addition, unlike the land-based method, the submarine method is different from the land-based method in that repeaters and cables are laid continuously over a short period of time (several days). Since the present invention can configure a multi-channel remote monitoring and meeting line, it is also advantageous for installation and construction work of submarine optical fiber cable transmission systems.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of the main parts of the apparatus according to the present invention. Figure 3 shows the clock control section (CC(S) and
Main part configuration diagram of CC(R)). FIG. 4 is a main signal frame configuration diagram. FIG. 5 is a configuration diagram of multiplexed remote monitoring meeting information.

Claims (1)

[Claims] 1 In a remote monitoring meeting device that superimposes and transmits distant meeting information transmitted between players on a digital transmission path onto the main signal transmitted on this digital transmission path, the remote meeting information of one channel and 8
An encoder and a decoder that mutually convert the 64kb/s PCM code are configured in one LSI circuit. means for generating a clock signal for each channel by dividing the frequency of the clock for configuring the main signal frame, and a means for generating a synchronization signal to be supplied to the LSI circuit from a signal obtained by dividing the clock for configuring the main signal frame. means for delaying and supplying the information by 8 bits at a time; a multiplexing converter for multiplexing the output of the encoder using a wired OR for the plurality of N channels; A remote monitoring and meeting device for a digital transmission line, comprising a demultiplexing section that applies a wired logical sum to the input of the decoder.