JPS5980035A - Information transfer method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an information transfer method using a part of a stuff designation pulse and a stuff pulse in a PCM communication system that multiplexes and transmits low-order group signals using a stuff synchronization method. The present invention relates to an information transfer method that can reduce the circuit scale.

(b) Background of the Technology In PCM communication systems, a stuff synchronization method is generally used when multiplexing a plurality of low-order group asynchronous digital signals to transmit a single high-frequency digital signal. In this stuff synchronization method, the synchronization signal frequency is set slightly higher than the input low-order group signal frequency, and when multiplexing is performed, stuff pulses (II Ill
However, the frequency deviation of the asynchronous digital signal of the lower order group can be absorbed by appropriately inserting the "°°0""timoyoi" at a pre-designated position. At this time, information on whether or not to insert a stuff pulse is separately superimposed on the multiplexed signal as a stuff designation pulse. In addition to the above-mentioned pulses, frame pulses and various service pulses for synchronization on the receiving side are also superimposed on the multiplexed signal. Information is exchanged between multiplexers using various service pulses that are allocated in advance, but increasing the number of service pulses increases the synchronization frequency, which reduces transmission efficiency and increases the circuit size. There is a limit naturally. Therefore, the stuff designation pulse and the stuff pulse may be used to exchange information between multiplexers. Normally, the staff designated pulse has n beeps) (n
is an odd number greater than 3), and is inserted and sent at a pre-designated position for each multiplexed low-order group signal of one frame. At this time, n bits are transmitted as the same code of "0". On the receiving side, it is determined whether a stuff pulse is inserted or not by the majority logic of n bits of stuff designation pulses. Therefore, if n bits are middle one
When sending information using bits, use this one bit.”
Even if it is sent as a DC signal with continuous 1's or 0's, the majority logic will not be damaged, and the probability that a stuff pulse is inserted in a multiplexer using the stuff synchronization method, that is, the stuff rate, is a value smaller than 1. Therefore, the stuff designation pulse will not be "1" continuously for several frames of the low-order group signal.Therefore, one bit out of n bits is
When sending information, it is sent as the above DC signal, so when sending information, it is necessary to use a DC signal in which the stuff pulses are made continuous with "bi" or "o", or m pieces are made consecutively with "1" and the next m' are made with "
By using a low frequency signal that is continuous with 0'', the receiving side can determine the presence or absence of information. Therefore, in the above method, information is transmitted using a part of the stuff designation pulse and the stuff pulse.

(C) Prior Art and Problems A conventional method of exchanging information using stuff designation pulses and stuff pulses will be explained with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing the configuration of a conventional transmitting side multiplexer, and FIG. 2 is a block diagram showing the configuration of a conventional receiving side multiplexer.

In the figure, 1 is a channel input section, 2 is a stuff control section, 3 is a multiplexing conversion section, 4.14 is a bipolar unipolar conversion section (hereinafter referred to as a rib), 5.21 is a storage device (hereinafter referred to as MEM), 6 7 is an input disconnection detection circuit, and 7 is a phase comparator (hereinafter P
8 is a selector, 9 is a stuff designation pulse generation circuit, 10 is a stuff designation pulse insertion circuit, 11 is a stuff pulse insertion circuit, 12 is a stuff rate control circuit, 1
3. 23 is a unipolar-bipolar conversion circuit (hereinafter referred to as U4), 15 is a demultiplexing circuit, 16 is a synchronization circuit, 17 is a destuffing control circuit, 18.19 is a detection circuit, 20 is a channel output section, and 22 is a voltage control circuit. This shows an oscillator (hereinafter referred to as ■CO).

The low-order group signal input to channel input section 1 is B104.
is converted into a unipolar signal and stored in MEM5, and P
At O2, the phase of the clock of the low-order group signal is compared with the clock of the synchronization signal that reads out the low-order group signal stored in MEM5, which has a slightly higher frequency than this clock, and the phase difference is determined. When the phase difference is such that the same information code of the low-order group signal is read twice, the clock that is read twice is prohibited and the phase is delayed, and the low-order group signal is read out from the MEM 5 and input to the multiplexing converter 3, and the selector A signal is sent to the stuff designation pulse generation circuit 9 via the input terminal 8.

In response to this signal, the stuff designation pulse generation circuit 9 sends a stuff designation pulse with 6 bits (n bits) to the stuff designation pulse insertion circuit 10 and the stuff pulse insertion circuit 11, and sends the stuff designation pulse to the multiplexing converter 3 to generate a predetermined signal. At the same time, the stuff pulse insertion circuit 11 sends the stuff pulse to the multiplex converter 3 so as to insert the stuff pulse at a pre-designated position of the information code of the low-order group signal in which the above-mentioned read clock is prohibited. The multiplex converter 3 multiplexes the low-order group signal, the stuff designation pulse, and the stuff pulse, and transmits the multiplexed signal to the transmission line via U413. At this time, when transmitting information using 1 bit out of n bits of the stuffing pulse, the stuffing pulse insertion circuit 1
When inputting information signal A to Kikuko, which inputs information A of 0,
The stuff designation pulse insertion circuit 10 is designed to make one bit out of n (bits) of stuff designation pulses of successive same low-order group signals 61" consecutively or 0" consecutively.

In addition, when sending information using stuff pulses, when information signal B is input to the information B input terminal of the stuff pulse insertion circuit 11, the stuff pulse insertion circuit 11 inserts the stuff pulses into the stuff pulse insertion positions of successive identical low-order group signals. It is designed to insert continuous pulses of 0 and 0, or m' consecutive pulses of 61 and m' consecutive pulses of 00. On the receiving side of the figure, the signal is converted into a unipolar signal in step 14 and demultiplexed by circuit 15.
Enter. At this time, the synchronization circuit 16 establishes frame synchronization of the multiplexing/demultiplexing circuit 15 using a frame pulse, and uses a low-order group signal, one bit of n bits of a stuff designation pulse for transmitting information A on the transmitting side, a stuff pulse, etc. The low-order group signal is sent to the ME by removing additional codes such as stuff designation pulses and stuff pulses in a destuffing control circuit.
The low-order group signal stored in MEM21 is read out using this clock as a smoothed clock synchronized with the clock of the signal inputted and stored in M21 and destuffed by VCO22, and converted into a bipolar signal in U423 and output. do. On the other hand, one bit among the n bits of the stuff designation pulse is input to the detection circuit 18, which determines whether the signal transmits information A or not, and outputs the presence or absence of information A. On the other hand, the stuff pulse is input to the detection circuit 19, which determines whether the signal transmits information B or not, and outputs the presence or absence of information B. However, if the input of the low-order group signal is cut off on the transmitting side in FIG. 1, the low-order group signal becomes "1" or "0" continuously, so the output of PO2 becomes an output in a continuous state with a phase difference of 90 degrees. If this continues, it will be necessary to continue inserting stuffing pulses or not inserting stuffing pulses.In other words, the stuffing rate will be 1 or O
becomes. When the stuffing rate is 1, the stuffing designation pulses are continuous l'1'', and when the stuffing rate is O, the stuffing designation pulses are continuous 00'', so it is difficult to distinguish by transmitting information using the above method, and it is not possible to use If the stuffing ratio is 0, there will be no stuffing pulses to insert, so it will no longer be possible to transmit one piece of information using the stuffing pulses. This cliff input break detection circuit detects the input break of the first low-order group signal on the path 6, controls the selector 8, and outputs the stuff rate control circuit 12 instead of the output of PO2.
, the stuffing rate control circuit 12 generates a signal that makes the stuffing rate close to the value during normal transmission, inputs it to the stuffing designation pulse generation circuit 9, and the stuffing designation pulse is used as the stuffing pulse during normal transmission. The information signals A and B are generated to be input at the information A and information B terminals so that the information signals A and B can be sent. However, since the range of the stuffing rate during normal transmission is very narrow, if an attempt is made to control the stuffing rate to the stuffing rate during normal transmission when the input is interrupted, there is a drawback that the circuit scale of the stuffing rate control circuit becomes large.

(d) Purpose of the Invention The purpose of the present invention is to provide an information transfer system that eliminates the above-mentioned drawbacks and allows the circuit scale to be reduced.

(e) Structure of the Invention In order to achieve the above object, the present invention makes it possible to implement successive parts of the stuff designation pulses using a small-scale circuit when information is transferred using a part of the stuff designation pulses. By using a repeating pattern of m consecutive 1"O" bits, even if the low-order group signal is disconnected, it can be determined on the receiving side, and when the low-order group signal is disconnected, the stuffing rate is set to 1. The feature is that the stuff pulse can be generated by constantly inserting it.

(f) Embodiment of the Invention An embodiment of the invention will be described below with reference to the drawings. Third
The figure is a block diagram showing the configuration of a multiplexing device on the transmitting side according to an embodiment of the present invention.

In the figure, parts with the same functions as those in FIG. 1 are indicated by the same symbols. 2'
10' is a stuffing control unit, 10' is a stuffing designation pulse insertion circuit, and 24 is an AND circuit.

The difference between FIG. 3 and FIG. 1 is that when the input of the low-order group signal is disconnected and detected by the input disconnection detection circuit 6, the output from PO2 is prohibited via the AND circuit 24, and the stuff designation pulse generation circuit 9 In this case, a signal that generates a stuffing designation pulse is emitted, and the stuffing rate is set to 1 while the input of the low-order group signal is cut off, thereby eliminating the need for the selector 8 and the stuffing rate control circuit 12 shown in FIG. When the information signal A is sent to the input terminal of information A, the specified pulse insertion circuit 10' inserts one of the n bits of the stuff specified pulse.
The point is that instead of the conventional continuous ``1'' or 0'' bits, a repeating pattern of m consecutive ``1'' bits is used. Therefore, if the low-order group signal is not disconnected, the output of PO2 is input to the stuffing designation pulse generation circuit 9 via the AND circuit 24, so the same operation as before is performed, but if the low-order group signal is disconnected, the stuffing The designated pulse generation circuit 9 inserts stuff designating pulses with all n bits of 1'' through the stuff designation pulse insertion circuit 10 into all the stuff designation pulse insertion positions of the low-order group signal, and all the stuff pulses Stuff pulse insertion circuit 1 is installed at the insertion position.
A stuff pulse is inserted at 1. When sending the information signal A using 1 bit out of n bits of the stuffing designation pulse, when the information signal A is input to the information A input terminal of the stuffing designation pulse insertion circuit 10, 1 bit out of the n bits is converted into m consecutive bits. A repeating pattern of 1”0” (e.g. 11
0""1"0'°), and can be sent using the same method as before. Correspondingly, in the multiplexer on the receiving side, the detection circuit 8 shown in Fig. 2 is configured to continuously transmit m bits. It is only necessary to be able to detect that information is present when a repeating pattern of 1"0" comes. As is well known, this can be realized by a small-scale circuit using a counter. This is a star that you need, but this is unnecessary.

Since the circuit scale is much smaller than that of the rough rate control circuit, it has the effect of reducing the circuit scale as a whole.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional multiplexer on the transmitting side, FIG. 2 is a block diagram showing the configuration of a multiplexer on the receiving side of the conventional example, and FIG. 3 is a block diagram showing the configuration of a multiplexer on the receiving side of the conventional example. FIG. 2 is a block diagram showing the configuration of a multiplexing device on the transmitting side. In the figure, 1 is a channel input section, 2 and 2' are stuff control sections, 3 is a multiplexing conversion section, 4.14 is a bipolar unipolar conversion section, 5.21 is a storage device, 6 is an input disconnection detection circuit, and 7
is a phase comparator, 8 is a selector, 9 is a stuff specification pulse generation circuit, 10.10' is a stuff specification pulse insertion circuit, 11 is a stuff pulse insertion circuit, 12 is a stuff rate control circuit, 13.23 is a unipolar bipolar conversion circuit ,
15 is a demultiplexing circuit, 16 is a synchronization circuit, 17 is a descraff control circuit, 18 and 19 are detection circuits, 20 is a channel output section, 22 is a voltage controlled oscillator, and 23 is an AND circuit.

Claims (1)

[Claims] PCM that multiplexes and transmits lower-order groups using stuff synchronization method
When transmitting information using a part of the stuff designation pulse in a communication system using a part of the stuff designation pulse and in an information transfer method using the stuff pulse, a part of the stuff designation pulse one after another is transferred into m-bit continuous bits. 1
An information transfer method characterized by having a repeating pattern of "0" and setting the stuffing rate to 1 when the low-order group signal is disconnected.