JPH0799485A - Fault location signal transmission method and fault location signal transmitter / receiver - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a fault point locating signal transmission method and a fault point locating signal transmitting / receiving apparatus, and an object thereof is to prevent fluctuation of delay time of the fault point locating signal. In a fault point locating signal transmitting / receiving device for transmitting / receiving a fault point locating signal through an SDH system having a multiple repeater, the fault point locating signal is connected to a signal transmitting device for transmitting a fault point locating signal and transmitted from the signal transmitting device. The fault location signal is transmitted from the transmitting-side multiple repeater via the transmission path S
Data in an SDH frame that is connected to a signal insertion device that inserts a fault location signal into a data communication channel in a DH frame and a receiving side multiplex relay device and that is transmitted from the transmitting side multiplex relay device via a transmission path A signal extraction device for extracting a fault location signal from the communication channel and sending it to the signal reception device is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault point locating signal transmitting method and a fault point locating signal transmitting / receiving apparatus for transmitting a fault point locating signal by placing it on a data communication channel of a synchronous digital hierarchy system.

Conventionally, a fault locator system has been used as a technique for locating a fault point that has occurred in a power transmission line and quickly repairing the fault point. The surge receiving type fault locator system in the fault locator system has a transmitter located at one end of the monitoring section and a receiver located at the other end, and a fault locator (hereinafter referred to as FL) signal (fault location signal). Since it is a method of transmitting and receiving, the strict conditions are required for the delay time of the signal propagating through the transmission path. Further, the fluctuation of the delay time causes a localization error, and therefore the fluctuation is not allowed.

Attempts have been made to grasp the FL signal as information to be transmitted and transmit the transmission in a synchronous digital hierarchy (hereinafter referred to as SDH) system.

[0004]

2. Description of the Related Art FIG. 9 shows a conventional fault locator signal transmission system. FL signal transmitter (FL device) 100S
The FL signal in the PG band (17.2 KHz) output from the (child) is converted into a 192 Kb / s PCM signal in the FL signal coding / decoding device (FL CODEC) 102S. The 192 Kb / s PCM signal is multiplexed with the other 192 KHz signal in the 1.5 Mb / s carrier relay signal multiplexer (1.5 Mb / s MUX) 104S and multiplexed into the 1.5 Mb multiplexed signal. . A 1.5 Mb / s multiplexed signal is a 6 Mb / s multiplexer (6 MMU
In (X) 106S, it is multiplexed with other 1.5 Mb / s signals to 6.3 Mb / s multiplexed signals. The 6.3 Mb / s multiplexed signal is multiplexed with another 6.3 Mb / s multiplexed signal in the 32 Mb / s multiplexer (32 MUX) 108S to obtain 32 Mb / s.
After being multiplexed into a multiplexed signal of / s, it is transmitted to the partner station or the like via the transmission line 110.

At the other station, the FL signal is returned to the PG band signal by performing the demultiplexing operation according to the reverse procedure of the above-mentioned multiplex transmission, and the FL signal receiving apparatus (FL apparatus) 100R is obtained.
It is transferred to (parent) and used for locating the fault point that occurred on the transmission line. Note that 108R, 106R, 104R, and 10
2R is 32Mb / s separation device (32M DMUX), 6Mb / s respectively
Separation device (6M DMUX), 1.5Mb / s carrier relay signal separation device (1.5M CR DMUX), and FL signal encoding / decoding device (F
L CODEC), the transmission side 32Mb / s multiplexer 108S, 6Mb / s
s multiplexer 106S, 1.5Mb / s carrier relay signal multiplexer 104S, and FL signal encoding / decoding device 10
The operation opposite to each operation of 2S is performed.

In this fault locator signal transmission system, the 1.5 Mb / s carrier relay signal multiplexer 104
S, 6Mb / s multiplexer 106S, 32Mb / s multiplexer 108S, 1.5Mb / s carrier relay signal separator 104R, 6Mb / s separator 106R, and 32Mb / s separator 108R are all staff members. It is composed of a system multiplexing device, and the stuff bit is inserted / removed for each multiplexing / demultiplexing so as to be synchronized with the input signal. Therefore, even if the transmission lines are sequentially multiplexed, the absolute delay time of the FL signal does not change. No error is included in the orientation of the failure point.

However, if the fault locator signal transmission system is simply applied to the SDH system, the absolute delay time of the FL signal becomes large and the delay time varies. The reason will be described below with reference to FIG.

FL apparatus 100S, FL signal coding / decoding apparatus 102S, and 1.5Mb / s carrier relay signal multiplexing apparatus 104S, FL apparatus 100R, FL signal coding / decoding apparatus 102S, and 1.5Mb / s carrier relay The signal separation device 104R is the same component as that of FIG.
The same reference numerals are given and the description thereof is omitted.

A multiplex conversion device (Mod-C) 120S, a line connection device (Mod-B) 122S, and a multiplex relay device (Mod-A) 12
4S indicates the SDH system on the transmission side, and the multiplex conversion device (Mod-C) 120R, the line connection device (Mod-B) 122R, and the multiplex relay device (Mod-C) 122R indicate the SDH system on the reception side. . The multiplexer 120S multiplexes the 1.5 Mb / s multiplexed signal from the 1.5 Mb / s carrier relay signal multiplexer 104S and another 1.5 Mb / s multiplexed signal to
It outputs a 2 Mb / s multiplexed signal. In that multiplexing,
The information position of each multiplexed information occupied in the SDH frame is rearranged according to the state of the input information. The information position of each multiplexed information to be rearranged is identified by a pointer placed in the SDH frame.

Further, the line connection device 122S routes between the 52Mb / s multiplexed signal from the multiplex converter 120S and another 52Mb / s multiplexed signal in units of 1.5Mb / s multiplexed signal. In the processing, SDH frames are rearranged using pointers in the same manner as in the multiplex conversion device 120S.

The final multiplexing process in the SDH system is performed by the multiplex relay device 124S. Even in the multiplex process by the multiplex relay device 124S, the SDH frame rearrangement is performed similarly to the multiplex converter 120S and the line connection device 122S. Is done. The multiple repeater 124
The multiplexing process at S is performed by the 52 from the line connection device 122S.
This is to multiplex the Mb / s multiplexed signal and another 52 Mb / s multiplexed signal to generate a 156 Mb / s multiplexed signal.

[0012]

As described above, if the conventional fault locator signal transmission method described with reference to FIG. 9 is simply incorporated into the SDH system, the multiplex converter 120S, the line connection device 122S, and the multiple relay device are provided. SD in the device 124S, the multiplex relay device 124R, the line connection device 122R, and the multiplex conversion device 120R
The H frame rearrangement process is inevitable. This rearrangement must change the pointer indicating the insertion position of the FL signal inserted in the SDH frame. The change of the pointer is performed by changing the devices 120S, 122S,
This means that the memory storage positions in 124S, 124R, 122R, and 120R are changed, so that not only the absolute delay time of the transmission signal is increased, but also the pointer is changed to change the pointer before the change in the same SDH frame. It is possible to prevent a change in the delay time from occurring between the position of the FL signal on the time axis indicated by and the position of the FL signal on the time axis indicated by the changed pointer. Can not. This fluctuation of the delay time causes an error in locating the failure point.

The present invention has been made in view of the above technical problems, and uses a data communication channel of an SDH frame for transmission of a fault point locating signal to prevent a variation in delay time and the like. It is an object of the present invention to provide a signal transmission method and a fault location signal transmission / reception device.

[0014]

The invention according to claim 1 is
In the method of transmitting a fault point locating signal, the fault point locating signal detected by the signal transmitting device is transmitted to a signal receiving device opposite to the signal transmitting device through an SDH system.
It is characterized in that the fault point locating signal is inserted into a data communication channel in an SDH frame transmitted from the H system to the signal receiving device via a relay transmission line and transmitted to the signal receiving device.

According to a second aspect of the present invention, as shown in FIG. 1, in a fault point locating signal transmitting / receiving apparatus for transmitting / receiving a fault point locating signal via an SDH system having multiple repeaters, a fault point locating signal is transmitted. Data communication in the SDH frame which is connected to the signal transmitting device 4 and which transmits the fault location signal transmitted from the signal transmitting device 4 from the transmitting side multiple repeater 2 of the SDH system via the transmission path 6. In the SDH frame transmitted from the transmission side multiplex relay device 2 of the SDH system via the transmission line 6, which is connected to the signal insertion device 8 for inserting the failure point locating signal into the channel and the reception side multiplex relay device 10. And a signal extracting device 12 for extracting the fault point locating signal from the data communication channel and sending it to the signal receiving device 14. And it features.

The invention according to claim 3 is, as shown in FIG. 2, in the fault point locating signal transmitting / receiving device according to claim 2, the signal inserting device 8 transmits the fault point locating signal in the bipolar signal format to the unipolar signal format. Bipolar / unipolar conversion circuit 16 for converting into a fault point locating signal, a multipoint sampling circuit 18 for sampling the unipolar signal format fault point locating signal converted by the bipolar / unipolar converting circuit 16 at multiple points, and multipoint sampling And a unipolar / bipolar conversion circuit 20 for converting the unipolar signal type fault point locating signal into a bipolar signal type fault point locating signal. The signal extracting device 12 is an SDH system receiving side multiple repeater. Failure of a bipolar signal type isolated from any data communication channel A bipolar / unipolar conversion circuit 28 for converting the orientation signal into a unipolar signal format fault point orientation signal, and a unipolar signal format failure point orientation signal converted by the bipolar / unipolar conversion circuit 28 into a regenerated signal speed signal. Resampling circuit 3 for conversion
0, and a unipolar / bipolar conversion circuit 32 for converting the unipolar signal type fault point locating signal converted by the resampling circuit 30 into a bipolar signal type fault point locating signal.

According to a fourth aspect of the present invention, as shown in FIG. 3, in the fault point locating signal transmitting / receiving device according to the second aspect, the signal inserting device 8 is a sampling circuit for sampling an analog fault point locating signal. 22, a coding circuit 24 for coding the fault point locating signal sampled by the sampling circuit 22, and a unipolar signal format fault point locating signal encoded by the coding circuit 24 in a bipolar signal format. The signal extraction device 12 is composed of a unipolar / bipolar conversion circuit 26 for converting into a fault point locating signal, and the signal extraction device 12 is a bipolar signal type fault separated from the data communication channel of the SDH frame in the receiving side multiple repeater of the SDH system. Bipolar / unipolar conversion circuit that converts a point orientation signal to a fault location signal in the unipolar signal format and extracts a received clock signal 34, a decoding circuit 36 for decoding the unipolar fault point locating signal converted by the bipolar / unipolar converting circuit 34, a unipolar fault point locating signal decoded by the decoding circuit 36, and the bipolar / unipolar conversion And an analog fault point locating signal generating circuit 38 for converting the unipolar signal format fault point locating signal decoded in response to the received clock signal from the circuit 34 into an analog fault point locating signal generating circuit 38. .

[0018]

According to the first aspect of the invention, the SDH is transmitted from the SDH system to the signal receiving device via the relay transmission line.
Since the fault point locating signal is inserted into the data communication channel of the frame for transmission, the delay time due to the rearrangement of the SDH frame in the SDH system is not included. If the fault point locating signal detects a fault point generated on the transmission line, the error due to the delay time can be excluded from the fault point locating.

Also in the invention according to claim 2, the fault point locating signal is inserted into the data communication channel of the SDH frame and transmitted, and the fault point locating signal is transmitted from the data communication channel of the transmitted SDH frame. The same effect can be obtained because the device for extracting is configured.

According to the third aspect of the present invention, the failure point locating signal in the bipolar signal format is converted into the failure point locating signal in the unipolar signal format and then sampling is performed to convert the failure point locating signal in the bipolar signal format into the unipolar signal. Since the resampling is performed after converting to the fault point localization signal of the form, the effect obtained by the inventions of claims 1 and 2 is enhanced, and the signal becomes strong against noise, and the fault point localization of the bipolar signal type is performed. It is possible to achieve a reduction in the amount of hardware required as compared with the case of directly sampling the signal and directly resampling the fault location signal of the bipolar signal type.

According to the invention of claim 4, while enjoying the effects obtained by the inventions of claims 1 and 2, the SDH system of the bipolar signal type and the fault location signal transmitting / receiving device of the analog signal type are provided. Can interface with.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 shows an embodiment of the invention according to claims 1 to 3. Reference numbers 100S and 10 shown in this figure
2S and 124S are the FL signal device, the FL signal coding / decoding device, and the multiple relay device on the transmission side shown in FIG. 9, respectively. Reference numerals 100R, 102R, and 124R are the FL signal receiving device, the FL signal coding / decoding device, and the multiple relay device on the receiving side shown in FIG. 8, respectively. Detailed description of each of these devices will be omitted. 39S, 39R
Are the FL signal interface devices (FL IN) on the transmission side showing the features of the invention according to claims 1 to 3, respectively.
F), FL signal interface device on the receiving side (FL INF)
Is.

FL signal interface device 39 on the transmitting side
S is, as shown in FIG.
A unipolar conversion circuit (hereinafter referred to as a B / U conversion circuit; indicated as B / U in the figure) 40, a sampling circuit 42,
It comprises a phase-locked oscillator 44 and a unipolar / bipolar conversion circuit (hereinafter referred to as a U / B conversion circuit, referred to as U / B in the figure) 46. The B / U conversion circuit 40 is connected to the output of the FL signal encoding / decoding device 102S,
The output of the conversion circuit 46 is connected to the gate circuit corresponding to the data communication channel (hereinafter referred to as DCC) of the SDH frame provided in the transmission-side multiplex repeater 124S of the SDH system. SDH
For the frame, see FIG. In FIG. 6, SO
H is a section head, of which D1 to D3, D
4 to D12 are DDC.

In the multi-repeater 124S, there is a gate circuit corresponding to D4 to D12 in the DCC of the SDH frame, and the gate circuit has two inputs. One of them is an FL signal input, and the other is a clock input of 576 kb / s corresponding to D4 to D12 in the DCC on the SDH frame on the time axis.

In the FL signal interface device 39R on the receiving side, as shown in FIG. 5, a B / U conversion circuit 50,
Resampling circuit 52, phase-locked oscillator 54, and U
It is composed of a / B conversion circuit 56. The input of the B / U conversion circuit 50 is connected to the gate output of the gate circuit corresponding to the DCC of the SDH frame provided in the transmission side multiplex repeater 124S of the SDH system, and the U / B conversion circuit 56 is F
It is connected to the input of the L signal encoding / decoding device 102R.

In FIG. 4, the multiple relay device 124S is
The FL device 100 corresponds to the transmission side multiplex relay device 2 of FIG.
The S and FL signal encoding / decoding device 102S corresponds to the signal transmitting device 4 in FIG. The transmission line 110 corresponds to the transmission line 6 of FIG. 1, and the FL signal interface device 39S is
It corresponds to the signal insertion device 8 of FIG. Multiplexing device 124
R corresponds to the receiving-side multiplex relay device 10 of FIG. 1, and the FL signal interface device 39R is the signal extraction device 1 of FIG.
Corresponds to 2. In FIG. 5, the B / U conversion circuit 40 is
Corresponding to the bipolar / unipolar conversion circuit 16 of FIG. 2,
The sampling circuit 42 and the phase locked oscillator 44 are shown in FIG.
This corresponds to the multipoint sampling circuit 18 of. The U / B conversion circuit 46 is the unipolar / bipolar conversion circuit 20 of FIG.
Corresponding to. The B / U conversion circuit 50 corresponds to the bipolar / unipolar conversion device 28 of FIG. The resampling circuit 52 and the phase locked oscillator 54 correspond to the resampling circuit 30 in FIG. 2, and the U / B conversion circuit 56 corresponds to the unipolar / bipolar conversion circuit 32 in FIG.

The operation of the embodiment shown in FIGS. 4 and 5 constructed in this way will be described below. The FL signal detected by the FL device 100S that detects a fault point that has occurred on the power transmission line is passed through the FL signal encoding / decoding device 102S to B / U.
It is input to the conversion circuit 40 in a 192 Kb / s bipolar signal format. The FL signal of the bipolar signal format is B /
The U conversion circuit 40 converts the signal into a unipolar signal.

The 192 KHz unipolar signal is multipoint-sampled by the sampling circuit 42 by the 576 KHz clock signal from the phase locked oscillator 44 and converted into a 576 KHz unipolar signal.

The 576 KHz unipolar signal is converted to a bipolar signal by the U / B conversion circuit 46, and corresponds to D4 to D12 in the DCC of the SDH frame provided in the transmission side multiple repeater 124S of the SDH system. It is supplied to the FL signal input of the gate circuit. D4 to D12 in the DCC on the SDH frame of the SDH system are
Viewed on the time axis, it corresponds to a signal speed of 576 KHz. 576 KH for the clock input (not shown) of the gate circuit
Since the timing signal for the gate of z is supplied, F
The 576 KHz unipolar signal supplied to the L signal input is
It is inserted into D4 to D12 in the DCC of the above-mentioned SDH frame and transmitted to the transmission line 110.

As described above, in the inventions according to claims 1 to 3, as for the FL signal, as in the case where the conventional fault locator signal transmission system is simply applied, the multiplex conversion device 120S and the line connection device 122S. , Repeater 1
The FL signal can be placed on the DCC in the SDH frame without rearranging the SDH frame in 24S. There is no variation in delay time caused by the rearrangement of SDH frames on the transmission side.

As described above, the operation of extracting the FL signal transmitted from the FL device 100S on the transmission side, which has detected the occurrence of the failure point, through the SDH system and the transmission line 110, to the FL device 100R on the reception side. This will be described below.

Multiplexing device 12 on the receiving side of the SDH system
The 4R also has the same configuration as that of the transmitting-side multiplex relay device 124S, so that the S transmitted through the transmission line 110 is transmitted.
The signal portion corresponding to D4 to D12 in the DCC of the DH frame is extracted by the clock signal of 576 KHz, and the B / U conversion circuit 5 of the FL signal interface device 30R is extracted.
Input to 0. The FL signal in the bipolar signal format is converted into a unipolar signal by the B / U conversion circuit 50. At that time, a reception clock signal is generated from the B / U conversion circuit 50.

In response to the received clock signal, the phase-locked oscillator 46 generates a clock signal of 576 KHz and a clock signal of 196 KHz. The B / U conversion circuit 50
The 576 KHz FL signal converted to a unipolar signal by
It is resampled by a clock signal of 576 KHz and converted into an FL signal with a pulse width of 100%. A pulse width of 100% means that the part that represents "1" of a bipolar signal is converted to a signal (high level signal) that represents "1" of a unipolar signal,
It means that a portion representing "0" of the bipolar signal is converted into a signal (low level signal) representing "0" of the unipolar signal. Then, the FL signal is further converted into a FL signal of 192 KHz by the clock signal of 192 KHz.

The 192 KHz unipolar signal format FL signal thus generated is 192 KHz in the U / B conversion circuit 56.
Is converted into the FL signal of the bipolar signal format. The 192 KHz FL signal in the bipolar signal format is supplied to the FL signal code decoding device 102R and the FL device 100R as described with reference to FIG. 9 and used for locating the failure point.

Also in the reception of the FL signal on the receiving side, the FL signal is directly extracted from the multiplex relay device 124R without passing through the multiplex repeater device 124R, the line connection device 122R, and the multiplex conversion device 120R of the SDH system. Therefore, if the conventional fault locator signal transmission method is simply applied to the SDH system, the SD
It is possible to eliminate fluctuations in the delay time on the receiving side that occur due to the rearrangement of H frames.

FIG. 7 shows an embodiment of the invention according to claim 1, claim 2, and claim 4. Reference numerals 100S and 124S shown in this figure respectively indicate the transmission side F shown in FIG.
An L signal transmission device and a multiplex relay device. Also, reference number 1
00R and 124R are FLs on the receiving side shown in FIG. 9, respectively.
They are a signal receiving device and a multiple repeater. Detailed description of each of these devices will be omitted. Reference numerals 60S and 60R denote a FL signal conversion apparatus (FLADP) on the transmission side, which shows the characteristic portions of the inventions according to claim 1, claim 2, and claim 4, respectively.
It is a FL signal converter (FL ADP) on the receiving side.

As shown in FIG. 8, the FL signal converter 60S includes a transformer 70, a level adjusting circuit 72, an AGC circuit 74, a PG band bandpass filter 76, a sampling circuit 78, which are connected to the output of the FL signal device 100S. It is composed of a phase-locked oscillator 80, an encoder (A / D) 82, and a U / B conversion circuit 84. The output of the U / B conversion circuit 84 is SD
The signal is supplied to the FL signal input of the gate circuit corresponding to D4 to D12 in the DCC of the SDH frame of the multiplex repeater 124S of the H system on the time axis, and the clock signal of 576 KHz is supplied to the clock input of the gate circuit. To be done.

As shown in FIG. 8, the FL signal conversion device 60R includes a B / U conversion circuit 71, a decoder (D / A) 72, a resampling circuit 78A, a phase locked oscillator 75, a low pass filter (LPF). 77, PG band band pass filter (PG band
BPF) 79, a level adjusting circuit 81, and a transformer 83. The input of the B / U conversion circuit 71 is connected to the gate outputs of the gate circuits corresponding to D4 to D12 in the DCC of the SDH frame of the multiplex repeater 124S of the SDH system on the time axis. SD for signal input of the gate circuit
F corresponding to D4 to D12 in the DCC in the H frame
An L signal is supplied, and a 576 KHz clock signal is supplied to the clock input.

In FIG. 5, the multiplex relay device 124S is
The FL device 100 corresponds to the transmission side multiplex relay device 2 of FIG.
S corresponds to the signal transmission device 4 in FIG. Transmission line 110
Corresponds to the transmission line 6 of FIG. 1 and is equivalent to the FL signal converter 60S.
Corresponds to the signal insertion device 8 of FIG. Multiplexing device 1
24R corresponds to the transmitting-side multiplex relay device 10 of FIG.
The L signal conversion device 60R corresponds to the signal extraction device 12 in FIG. The FL device 100R is the signal receiving device 14 of FIG.
Corresponding to. In FIG. 8, a transformer 70, a level adjusting circuit 72, an AGC circuit 74, a PG band band pass filter 7
6, sampling circuit 78, and phase-locked oscillator 80
Corresponds to the sampling circuit 22 of FIG. 3, and the encoder 82 corresponds to the encoding circuit 24 of FIG. U / B conversion circuit 84
Corresponds to the unipolar / bipolar conversion circuit 26 of FIG. The B / U conversion circuit 71 corresponds to the unipolar / bipolar conversion circuit 34 of FIG. 3, and the decoding circuit 72 is equivalent to that of FIG.
Of the decoding circuit 36. Resampling circuit 78
A, phase locked oscillator 75, low pass filter 77, PG
The band-pass filter 79, the level adjusting circuit 81, the level adjusting circuit 81, and the transformer 83 correspond to the analog fault point locating signal generating circuit 38 of FIG.

The operation of the embodiment of the invention according to claim 1, claim 2, and claim 4 configured as described above will be described below. The FL signal generated from the transmission side FL device 100S that has detected the fault point that has occurred in the power transmission line is input to the level adjustment circuit 72 via the transformer 70 of the FL signal conversion device 60S. The level adjusting circuit 72 adjusts the signal level of the input FL signal to an appropriate signal level and then
The circuit 74 produces an FL signal of a constant level. This F
The L signal is made into only the PG band FL signal by the PG band band pass filter 76, supplied to the sampling circuit 78, and sampled by the 72 KHz clock signal from the phase locked oscillator 80. Each sampled value of the sampled FL signal is an 8-bit binary signal in the encoder 82.
(PCM signal of 576 KHz) is encoded.

The 576 KHz PCM signal (unipolar signal) is converted into a bipolar signal by the U / B conversion circuit 84 and supplied to the FL signal input of the gate circuit (not shown) of the multiplex repeater 124S. Since a clock signal of 576 KHz is supplied to the clock input of this gate circuit, the FL signal of 576 KHz is gated by the clock signal of 576 KHz and inserted into D4 to D12 in the DCC of the SDH frame. . The SDH frame is SDH
It is transmitted on the transmission line of the system.

On the transmitting side of this embodiment, it is not necessary to rearrange the SDH frame as described with reference to FIG. 9 for each module. Therefore, when the FL signal is inserted into the SDH frame for transmission, the delay time is reduced. Fluctuations can be excluded.

In this way, the transmission side multiplex relay device 12
The extraction of the FL signal in the SDH frame transmitted from the 4S on the transmission path 110 by the receiving side device will be described below.
In the multiple relay device 124R that receives the SDH frame,
The clock signal of 576 KHz corresponding to D4 to D12 in the DCC of the SDH frame is the multiple repeater 124R.
Since it is supplied to the clock input of the gate circuit which is provided in the SDH frame and receives the FL signal in the SDH frame at the FL signal input, it is inserted in D4 to D12 of the DCC 57.
An FL signal of 6 KHz bipolar signal format is output from the gate circuit.

The FL signal is converted by the B / U conversion circuit 71 into a binary signal in the unipolar signal format. Also, B / U
A reception clock signal is generated from the conversion circuit 71. The converted FL signal in the unipolar signal format is decoded by the decoder 72.
Is converted to a PAM signal with a pulse width of 100%.

The PAM signal is sampled by the resampling circuit 78A by the 72 KHz clock signal generated from the phase locked oscillator 75 in synchronization with the received clock signal and converted into a PAM signal having a pulse width of 12.5%. With respect to the PAM signal having a pulse width of 12.5%, the high-frequency component of the PAM signal is removed by the low pass filter 77, and only the PG band FL signal is extracted by the PG band band pass filter 79. The signal level of the signal is the level adjustment circuit 8
After the signal level is adjusted to the proper signal level by 1, the transformer 83
It is supplied to the FL device on the receiving side through and used for locating the failure point.

Also on the receiving side of this embodiment, it is not necessary to perform the SDH frame rearrangement as described with reference to FIG. 9 for each of the multiplex conversion device, the line connection device, and the multiplex relay device, so that the SDH frame is inserted into the SDH frame. Also in the extraction of the transmitted FL signal, the fluctuation of the delay time can be eliminated.

[0047]

As described above, according to the present invention, S
Since the FL signal is inserted into the DCC of the SDH frame of the transmission side multiplex relay device of the DH system and the FL signal is extracted from the inside of the DCH of the SDH frame of the receiving side multiplex repeater device, fluctuations in delay time can be eliminated. . Therefore,
It is possible to eliminate the localization error of the fault point due to the transmission of the FL signal.

[Brief description of drawings]

1 is a principle block diagram of an invention according to claim 2;

FIG. 2 is a principle block diagram of an invention according to claim 3;

FIG. 3 is a principle block diagram of an invention according to claim 4;

FIG. 4 is a diagram showing an embodiment of the invention according to claims 1 to 3;

5 is a detailed view of a characteristic portion of the embodiment shown in FIG.

FIG. 6 is a configuration diagram of a main part in an SDH frame.

FIG. 7 is a diagram showing an embodiment of the invention according to claim 1, claim 2 and claim 4;

FIG. 8 is a detailed view of a characteristic part of the embodiment shown in FIG.

FIG. 9 is a diagram showing a conventional fault locator signal transmission system.

FIG. 10 is a diagram for explaining a problem when the fault locator signal transmission system shown in FIG. 9 is applied to an SDH system.

[Explanation of symbols]

 2 Multiplexing device on transmitting side 4 Signal transmitting device 6 Transmission line 8 Signal inserting device 10 Multiplexing device on receiving side 12 Signal extracting device 14 Signal receiving device 16 Bipolar / unipolar converting circuit 18 Multipoint sampling circuit 20 Unipolar / bipolar converting circuit 22 Samples Decoding circuit 24 Decoding circuit 26 Unipolar / bipolar conversion circuit 28 Bipolar / unipolar conversion circuit 30 Resampling circuit 32 Unipolar / bipolar conversion circuit 34 Bipolar / unipolar conversion circuit 36 Decoding circuit 38 Analog fault location signal generation circuit 39S FL signal interface Device 39R FL signal interface device 40 B / U conversion circuit 42 Sampling circuit 44 Phase-locked oscillator 46 U / B conversion circuit 50 B / U conversion circuit 52 Re-sampling circuit 54 Phase-locked oscillation 56 U / B conversion circuit 60S FL signal conversion device 60R FL signal conversion device 70 Transformer 71 B / U conversion circuit 72 Level adjustment circuit 72A Decoder 74 AGC circuit 75 Phase-locked oscillation circuit 76 PG band bandpass filter 77 Low pass Filter 78 Sampling circuit 78A Resampling circuit 79 PG band bandpass filter 80 Phase-locked oscillator 81 Level adjusting circuit 82 Encoder 83 Transformer

Claims (4)

[Claims] 1. A fault point locating signal transmission method for transmitting a fault point locating signal detected by a signal transmitting device to a signal receiving device opposite to the signal transmitting device via an SDH system, comprising: a relay transmission line from the SDH system. A fault point locating signal transmitting method, characterized in that the fault point locating signal is inserted into a data communication channel in an SDH frame transmitted to the signal receiving device via the signal and transmitted to the signal receiving device. 2. A fault point locating signal transmitting / receiving device for transmitting / receiving a fault point locating signal through an SDH system having a multi-repeater, the signal being connected to a signal transmitting device (4) for transmitting a fault point locating signal, The fault point locating signal transmitted from the transmitter (4) is transmitted to the data communication channel in the SDH frame transmitted from the transmission side multiple repeater (2) of the SDH system via the transmission line (6). SDH which is connected to a signal inserting device (8) for inserting an orientation signal and a receiving-side multiplex repeating device (10) and is transmitted from the transmitting-side multiplex repeating device (2) of the SDH system through a transmission line (6). A signal extracting device (12) for extracting the fault point locating signal from the data communication channel in the frame and sending it to the signal receiving device (14)
And a fault location signal transmitting / receiving device. 3. The fault point locating signal transmitting / receiving device according to claim 2, wherein the signal inserting device (8) converts a bipolar signal type fault locating signal into a unipolar signal type fault locating signal. A conversion circuit (16), a multipoint sampling circuit (18) for multipoint sampling of a unipolar signal format fault point localization signal converted by the bipolar / unipolar conversion circuit (16), and a multipoint sampled unipolar signal format And a unipolar / bipolar conversion circuit (20) for converting the fault point locating signal into a bipolar signal type fault locating signal. The signal extracting device (12) is a receiving-side multi-repeater of the SDH system, and an SDH frame A fault location signal in bipolar signal format separated from the data communication channel is A bipolar / unipolar conversion circuit (28) for converting into a fault point localization signal in a polar signal format, and a signal of a signal speed at which the unipolar signal format fault point localization signal converted by the bipolar / unipolar conversion circuit (28) is reproduced. A resampling circuit (30) for converting to
A failure characterized by comprising a unipolar / bipolar conversion circuit (32) for converting the unipolar signal type failure point locating signal converted by the resampling circuit (30) into a bipolar signal format failure point locating signal. Point location signal transmitter and receiver. 4. The fault point locating signal transmitting / receiving device according to claim 2, wherein the signal inserting device (8) samples a sampling point (22) of the analog fault locating signal, and the sampling circuit (22). ), A coding circuit (24) for coding the fault point locating signal sampled by), and a unipolar signal format fault point locating signal encoded by the coding circuit (24) The signal extraction device (12) is composed of a unipolar / bipolar conversion circuit (26) for converting into a signal, and the signal extraction device (12) is of a bipolar signal format extracted from the data communication channel of the SDH frame by the receiving side multiple repeater of the SDH system. Bipolar / converts the fault point localization signal to the unipolar signal format fault point localization signal and extracts the received clock signal
A unipolar conversion circuit (34), a decoding circuit (36) for decoding the unipolar fault location signal converted by the bipolar / unipolar conversion circuit (34), and a decoding circuit (36) An analog fault point locating signal for converting a unipolar fault point locating signal and a unipolar signal format fault point locating signal decoded in response to the received clock signal from the bipolar / unipolar converting circuit (34) into an analog fault point locating signal. A fault point locating signal transmitting / receiving apparatus comprising a generating circuit (38).