JPS59107672A - Transmitter of auxiliary signal - Google Patents

Abstract

PURPOSE:To simplify the constitution of the transmitter eliminating the need for frame synchronism by providing a violation designating pulse generating circuit to a circuit sampling an auxiliary signal. CONSTITUTION:A transmission section 20 and a receiving section 27 are operated by using a clock pulse 10 as a reference pulse, a main signal 1 inputted to the transmission section 20 is converted into a CMI code train by a CMI converting circuit 21 and processed into random code where (1) and (0) are not consecutive. Further, a periodic auxiliary signal 2 inputted to the transmission section 20 is sampled by a sampling circuit 22, and when a sampling pulse 24 is at (1) level by the violation designating pulse generating circuit 23, a violation designating pulse 25 is applied to the circuit 21 after 2-bit to the time slot. When this pulse 25 has (0) time slot, the pulse is coded in the CMI code rule, and when the pulse has the time slot of (1), the pulse is coded by other code rule and transmitted to the receiving side 27. This signal is applied to a violation detecting circuit 29 and a CMI decoding circuit 28 so as to output a main signal 6 and an output 7 of an auxiliary signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides non-consecutive transmission codes of °1"' and °'
This relates to an auxiliary signal superimposition method in which auxiliary signals such as line switching control signals, monitoring signals, and split meeting signals are transmitted as one signal on the main signal using a CMI code consisting of a random code of O'''.CMI The conventional auxiliary signal 1 tatami method, which superimposes an auxiliary signal on a main signal using a code string, converts the main signal 1 input to the transmitter 11 into a CMI code string by a CMI conversion circuit 12, as shown in FIG. At the same time, the above-mentioned time corresponding to the auxiliary signal is subjected to encoding that does not follow the CMI encoding rule and is superimposed. In CMI encoding, for example, as shown in FIG. 3(C), the main signal 1 is 0''. When the main signal 1 is 1'', it is "01", and when the main signal 1 is 1'', it is "o o".
Convert to alternating codes of ''' and 11'' and randomize the codes. On the other hand, the control signal input to the Ft section 11,
A periodic auxiliary signal 2 consisting of a monitoring signal and the like and a frame pattern signal 3 for frame synchronization (one frame has 10 clocks) outputted from a frame pattern generation circuit 14 are input to a sampling circuit 13. When the sample value is 1#, the 1-bit pulse becomes u and #, and when the sample value of frame pattern signal 3 is °゛0#, it becomes 41 Q #, and when the sample value is °'1'', it becomes "'1". A 1-bit pulse is generated, and this is designated as the biolage illegal designation pulse 4.Pioneering means that the main signal is removed from the coding rule when CMI-encoded, and the biolage four designation pulse 4 is used. Tights that cause
The main signal is not CMI encoded in the slot.

For example, as shown in Fig. 3(d), the main signal 1 is in the time slot when the biolage eye designation pulse 4 is °'1'' (the position marked with an asterisk, i.e., the time slot indicated by diagonal lines in Fig. 2). When the main signal 1 is tl 1 #l, the alternation of "00" and °゛11'' is prohibited for that time slot and removed from the CMI coding rule. CM that causes a violation when the sign of designated pulse 4 is 0''
Follows the I sign rule. In this way, the transmission line signal 5 subjected to biolage processing is sent to the receiving section 15 in accordance with the frame pattern signal 3 and the auxiliary signal 2.

On the other hand, in the receiving section 15, the transmission path signal 5 is input to the CMI decoding circuit 16 and decoded into the original main code 1. The transmission line signal 5 is also input to the bioregene detection circuit 17, which detects the time slot in the CMI code string of the transmission line signal 5 where there is a violation of the biorage, and detects the biorage which becomes °゛1'' at that time slot position. The frame synchronization circuit 18 and the auxiliary signal separation circuit 19 are then sent to the frame synchronization circuit 18 and the auxiliary signal separation circuit 19.

7 Remedy synchronization circuit 19 is biolage position pulse 8
Detecting the position signal of the frame pattern in the frame pattern to establish synchronization, and generating an auxiliary signal superimposition position pulse 9 that becomes 1'' at the time slot position where the auxiliary signal should be superimposed,
The signal is sent to the auxiliary signal separation circuit 19. In the auxiliary signal separation circuit 19, when the sign of the biorage cuff position pulse 8 is ``0'' at the time slot position where the auxiliary signal superimposition position pulse 9 is ``1'''', the auxiliary signal cuff sign 8 n' ( S.I.
'+81'+...) is alo a', t(1#
In this case, Sゎ' is set to °'1'', the original auxiliary signal is reproduced by enlarging this pulse width, and auxiliary signal 7 is output.

As explained above, in the conventional method, the transmitting side assembles frames for biolage, and the receiving side performs frame synchronization and separates auxiliary signals. Frame synchronization circuit 1 performs frame synchronization and separates auxiliary signals.
8 is a circuit that generates a pseudo 7 frame pattern, a circuit that detects the frame pattern in the received pie ray 91 frame position pulse 8, and establishes synchronization based on the 5-7 frame pattern output from the above two circuits. Since a synchronization pull-in circuit is required to perform synchronization, and a period protection circuit is required to protect synchronization against code errors, the circuit becomes complex and considerably large in scale.

An object of the present invention is to provide an auxiliary signal transmission device with a simple circuit and a small device size in an auxiliary signal transmission system using a CMI code as a transmission path code.
In an auxiliary signal separation circuit that transmits a main signal encoded using the MI coding rule by V-folding auxiliary signals such as a control signal and a monitoring signal, the transmission section includes a sampling circuit that samples the auxiliary signal, and the sampling circuit. The output signal of a
A violation specifying circuit that determines the time slot corresponding to t1n and the time slot after n (n is an integer of 1 or more) bits; The CM corresponding to a time slot with a biolage target
The CMI code rule was applied to the time 6-slot of the I code string. The receiving section includes a CMI conversion circuit that performs unaltered encoding, and a CM reprint circuit that decodes the received signal to the main signal, and a CMT encoding rule violation circuit that detects (n-1) pit interval violation points. Z) An auxiliary Iba signal transmission characterized by including a biorage sun hydrant circuit and an auxiliary 4; +, 1ijr
,, < 4f19 At 6° Next, we will discuss the embodiment of the present invention with reference to the drawings.

Figure 4 shows the fruits of this invention! A block diagram of the inertia 11, FIG. 5 shows a timing chart of each part of FIG. 4. In FIG.
operates as the reference clock. The main signal 1 inputted to the transmitter 20 is converted into a CM■ code string by the CMI conversion circuit 21, and is randomized into a CM code string that does not include Par1# and "0" codes.

On the other hand, the periodic auxiliary signal 2 input to the transmitter 20 is sampled by the sampling circuit 22 and becomes a 1-bit sampling pulse 24. The biolage designation pulse generation circuit 23 has a sampling time of /L//(24 is "1").
'', pulses are formed in this time slot and the time slot 2 bits later to create a violation designation pulse 25.The violation designation pulse 25 is input to the CMI conversion circuit 21, and the violation designation pulse 25 is input to the CMI conversion circuit 21, In the time slot when the register quadruple m-leg pulse is II O#l, the main signal 1 is CMI encoded according to the CMI coding rule, and the time slot when it is ``1'' (shaded area in Figure 5)
Then, the CMI code string of main signal 1 is encoded using a violation, that is, a code rule different from the CMI code rule. In this way, in response to the auxiliary signal 2, the transmission line code 26 (CMIfi code) obtained by performing biorage encoding on the CMI-encoded main signal 1 is sent to the receiving unit 27.

In the receiving section 27, the transmitted transmission line signal 26 (C
The MI signal) is sent to the biorage detection circuit 29 and at the same time sent to the CMI decoding circuit 28 where the original main signal 6 is sent to the CMI decoding circuit 28.
will be returned to. Biolage sun detection circuit 29tj:, 1
It has a built-in bit shift register and transmits the transmission line signal 2.
'1' is detected only when a violation occurs every other bit in the code of the transmission line signal 26 (CMI code). is 10'' sample pulse 3
Outputs 1. This sample pulse 31 is input to the auxiliary signal decoding circuit 30, and when the sample pulse 31 is '0#, the code of the auxiliary signal cuff is uOa+, and when it is uls, it is 1.
The pulse that is generated after # is set to be 1 bit after sampling pulse 24, but 1 bit 9-
Not limited to. In this case, the violation detection circuit 29 only needs to increase the number of bits of the built-in shift register.

As explained above, the circuit configuration according to the present invention does not require frame synchronization, and an auxiliary signal transmission device using the violation section of the CMI coding rule can be realized with a simple and relatively small-scale circuit configuration. - I can.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of a conventional auxiliary signal transmission device, Fig. 2 is a time chart of each part of Fig. 1, and Fig. 3 is a waveform diagram showing an example of CMT encoding of the conventional auxiliary signal transmission device. , FIG. 4 is a block diagram showing one embodiment of the auxiliary signal transmission device of the present invention, and FIG. 5 is a time chart of each part of FIG. 4. 1... Main signal (binary code) input, 2...
・Auxiliary signal input, 3... Frame pattern signal, 4.25... Biores code designation pulse, 5... Transmission line signal (CMI code), 6...
...Main signal (usually binary code output), 7...
Auxiliary signal output, 8...Piolet 21 position pulse, 9...Auxiliary signal superimposition position pulse, lO.
...Clock pulse, 11.20...Transmitter, 15,27...Receiver, 12,21...
...CMI conversion circuit, 13.22...Sampling circuit, 14...Frame pattern generation circuit, 16°28...CMI decoding circuit, 17.
29... Bio 10- Resilon detection circuit, 18... Frame same XJ
j circuit, 19... Auxiliary signal separation circuit, 23.
...Biolage, N specified pulse generation circuit, 30
...Auxiliary signal decoding circuit. 11-

Claims (1)

[Claims] An auxiliary signal transmission device that superimposes and transmits auxiliary signals such as control signals and monitoring signals on the main signal encoded using the CMI coding rule, which randomly encodes the main signal so that "0" and 61''' are not consecutive. In ``, the transmitter specifies a sampling circuit that samples the auxiliary signal, a time slot in which the output signal of the sampling circuit corresponds to II II, and a time slot after n (nl; l; an integer of 1 or more) bits. a biolage target designation circuit, converting the main signal into a CMI code string according to the CMI code rule, and converting the main signal into a CMI code string corresponding to the time slot with the biolage designation according to the CMI code rule; The receiver includes a CMI decoding circuit that copies the received signal into the main signal, and a CMI converter that detects the CMI coding rule violation code with a bit interval of %(''-1). 1. An auxiliary signal transmission device comprising: an auxiliary signal decoding circuit for obtaining an original auxiliary signal from the output of the biolage detection circuit;