JP2001119770A - Monitor signal control signal transfer system for overhang device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor signal control signal transfer system for an overhang device where no exclusive TS is required for transfer of a monitor control signal through a subscriber line between overhang devices. SOLUTION: A 2B1Q package 5 connected to a 6M multiplex conversion section and a 6M demultiplex conversion section 7 consists of a 1st port 14 comprising a 2W/4W conversion section 8 accommodating a line, a 2B1Q termination generating section 9 that terminates a 2B1Q transmission line signal and converts it into an in-device signal or generates a 2B1Q transmission line signal, an M-bit insertion section 10 that inserts M-bits to the in-device signal, a 2M/6M conversion section 11 that conducts velocity conversion, a 6M/2M conversion section 12, and a M-bit extract section 13 that extracts M-bits required for the 2B1Q transmission signal from the in-device signal, a 2nd port 15 having the same functions as those of the 1st port 14, a monitor control interface section 16 that sends/receives a monitor control signal between the central monitor control section and a 2B1Q package, and a CPU 17 that controls each section in the inside of the package.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring control signal transfer system for an overhanging device, and relays M bits for monitoring and control used in a 2B1Q echo canceller transmission system by an overhanging device provided in the middle of a line. In this case, an overhanging device monitoring control signal transfer method that enables M-bit transfer between overhanging devices.

[0002]

2. Description of the Related Art Various types of communication systems for digital subscriber lines are standardized and operated, and one of them is a 2B1Q echo canceller transmission system. 2B1Q means quaternary coding, and the 2B1Q echo canceller transmission method uses a two-wire subscriber line, and uses a four-valued echo canceller to prevent a sneak path between transmission and reception signals at a transmission and reception separation point. This is a method for performing coded signal communication.

[0003] Next, a transmission system with an extended function in which an overhanging device is provided to effectively use a subscriber line in the 2B1Q echo canceller transmission system, a plurality of subscriber lines are multiplexed, and overhangs at an arbitrary point. explain.

FIG. 6 shows an example of the configuration of a transmission system provided with a conventional overhanging device, which includes an exchange 1 having a 2B1Q interface and overhanging devices 2 and 3 for converting the 2B1Q interface into an interface corresponding to an arbitrary transmission line. And a digital service unit (hereinafter referred to as DSU) 4 installed on the user side.
Hereinafter, assuming a multiplexing device as an example of the overhanging device,
The exchange 1 for explaining the operation of FIG. 6 has a 2B1Q echo canceller transmission system as an interface of a subscriber line to be accommodated, and connects a plurality of predetermined subscriber lines.
In this configuration example, 2B1Q accommodated by the exchange 1 is
A plurality of subscriber lines based on the echo canceller transmission system are multiplexed, and are extended to the B station via the extension device 3 composed of a multiplexing device. Therefore, the overhanging device 2 is 2
The line of the B1Q echo canceller transmission system is terminated, a time slot (hereinafter, referred to as a TS) constituting a received signal is discriminated and separated, and the M bit, which is a monitoring control signal of the separated 2B1Q echo canceller transmission system, and the overhanging device 2
And a required supervisory control bit is added to the main signal, and a plurality of subscriber lines are multiplexed to generate a predetermined transmission line multiplexed signal, which is output to the overhanging device 3 installed in the B station.
The overhanging device 3 terminates the received transmission path multiplexed signal, identifies and separates it, generates a predetermined 2B1Q transmission signal based on the separated signal, and sets the DS2 installed at the user's home.
Output to U4. Therefore, the user performs communication using various terminals connected to the DSU4.

[0005]

However, the conventional monitoring control signal transfer method of the overhanging device has the following problems. That is, in the 2B1Q echo canceller transmission system, the main signal 2B exclusively occupying 3TS
+ D and M bits, which are monitoring control signals for performing start-up display and test control on the 2B1Q transmission line required between the exchange and the DSU, are transmitted. In the overhanging apparatus, 1 TS is allocated to the transmission of M bits. A total of 4 TSs are occupied by one line together with the main signal. FIG. 7 is a diagram showing a frame configuration of a main signal at a transmission rate of 6 Mb / s used between conventional overhanging devices. The figure shows an example of a 6M multiplexing device as an overhanging device.
96 multiplexes of 8-bit TS can be multiplexed between c.
If 4TS is occupied in order to transmit one line of the B1Q echo canceller transmission system, only 24 lines of the 2B1Q echo canceller transmission system can be accommodated as a 6M multiplexing device, preventing effective use of the 6M transmission line. I have.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem of the conventional supervisory control signal transfer system of an overhanging device. When the 2B1Q echo canceller transmission system is overhanged by the overhanging device, a countermeasure is required. It is an object of the present invention to provide a method for transferring a supervisory control signal of an overhanging device which does not require a dedicated TS for transferring the M-bit monitoring control signal between the overhanging devices.

[0007]

In order to achieve the above object, a monitoring control signal transfer method for an overhanging apparatus according to the present invention has the following configuration.

According to a first aspect of the present invention, there is provided an overhang apparatus for transmitting and receiving a subscriber transmission line signal to / from a digital service unit by relaying a subscriber line accommodated in an exchange. Terminating the subscriber line signal by establishing the synchronization of the subscriber line signal received from the digital service unit, and separating the supervisory control bits provided in the control channel constituting the subscriber line signal. The supervisory control bit of the subscriber transmission path signal is added to the vacant bits of the D channel constituting 2B + D of the user data channel, which is the main signal transmitted between the overhanging devices, and transferred to the overhanging device. In the overhanging device, the subscription added to the vacant bits of the D channel constituting 2B + D of the received user channel A monitoring control bit of the transmission line signal is extracted and added to the control channel constituting the subscriber transmission line signal to reconstruct a frame of the subscriber transmission line signal and to output the frame to the digital service unit or the exchange. .

According to a second aspect of the present invention, there is provided a system for transmitting a supervisory control signal of an overhanging apparatus, wherein the subscriber transmission path signal is a 2B1Q echo canceller transmission signal.

[0010] According to a third aspect of the present invention, the overhanging device monitoring control signal transfer system is configured such that the overhanging device is a multiplexing device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a diagram showing an example of the configuration of an apparatus for implementing a supervisory control signal transfer method according to the present invention. The figure shows a 6M multiplexer as an embodiment of an overhanging apparatus, and shows a 2B1Q termination package 5 having a 2B1Q interface connected to a subscriber line side or a switching line side of the 6M multiplexer. The 2B1Q termination package connects to the 6M multiplex conversion unit 6 and the 6M separation conversion unit 7.

The 2B1Q package 5 is the first port 1
4, a second port 15, a monitor and control interface 16 for transmitting and receiving a monitor and control signal between the centralized monitor and control unit provided in the device and the 2B1Q package 5, and a CPU 17 for controlling the inside of the 2B1Q terminal package 5. It consists of.

The first port 14 is a 2W / port for accommodating a subscriber line or an exchange line which is a U point interface.
A 4W conversion unit 8, a 2B1Q termination generation unit 9 for terminating the 2B1Q transmission signal and converting it to an internal signal, or generating a 2B1Q transmission signal, and converting an M bit, which is a supervisory control signal required for the 2B1Q transmission signal, into an internal signal An M-bit insertion unit 10 for insertion, a 2M / 6M conversion unit 11 for performing speed conversion for inputting the internal signal to the 6M multiplex conversion unit 6, and an internal signal separated by the 6M separation conversion unit 7 in a 2B1Q package. A 6M / 2M conversion unit 12 for converting the speed into a signal suitable for the processing speed;
The second port 15 has the same function as the first port 14.

Next, the operation of the first port will be mainly described. First, the 2W / 4W conversion unit 8 having the U point interface inputs a 2B1Q transmission signal at a transmission rate of 160 kb / s via a two-line subscriber line or an exchange line, and uses a hybrid transformer to perform 2B1Q transmission. The signal is converted into a 4-wire line signal necessary for internal processing of the terminal package 5 and output to the 2B1Q terminal generating unit 9.

In the 2B1Q termination generator 9, first,
In order to prevent the transmission signal on the 4-wire line side from wrapping around to the reception side in the 2W / 4W conversion unit 8, echo cancellation processing is performed, and furthermore, the 2B1Q transmission signal is terminated by establishing synchronization of the 2B1Q transmission signal. , The main signal and M bits are separated. The termination processing is performed at a processing speed of 2 Mb / s in order to increase the operation efficiency of the 2B1Q termination circuit, but the processing speed is compared with the 2B1Q transmission signal speed of 160 kb / s.
The reason why the speed is set as high as Mb / s is that a memory constituting the 2B1Q termination generating unit 9 uses a memory, and the memory capacity can be reduced by increasing the processing speed. Therefore, the output of the 2B1Q termination generator 9 has a signal speed in the device of 2 Mb / s.

After termination processing, the separated 2 Mb / s
The main signal 2B + D having the transmission speed of 8 bits × 3 =
The 2B1Q termination generation unit 9 outputs the data to the next-stage M-bit insertion unit 10 as a 3TS configuration of 24 bits, and the M bits separated by the 2B1Q termination generation unit 9
7 is output. The main signal output by the 2B1Q termination generating unit 9 uses only 2 bits of the D channel of TS3 forming 2B + D, and the remaining 6 bits are free areas, so 4 bits are used among them and M bits are used. Insertion section 10
In the 2B1Q termination generation unit 9, the
The M bits input through 17 are inserted into the main signal by a timing signal determined according to a predetermined 8-multiframe configuration.

Further, the output of the M bit insertion unit 10 is 2M / 6
6M multiplex conversion section 6 provided in the apparatus in M conversion section 11
In order to input the data, the speed is converted to 6 Mb / s and output.

FIG. 2 shows a frame configuration diagram of the 2B1Q transmission signal. FIG. 3A shows the frame structure of a 2B1Q transmission signal, where one frame is 1.5 msec and 4
By transmitting the value code, ie, 240 bits, 2B1
The Q transmission signal performs communication at a transmission speed of 160 kb / s. One frame is composed of a frame word composed of 8 bits,
18 bits (2B + D: B = 8 bits, D = 2 bits)
, And 12 sets of 2B + D main signals, and M bits used for supervisory control consisting of 6 bits. FIG.
(B) shows a multi-frame configuration of a 2B1Q transmission signal, in which eight frames are used as multi-frames so that M bits can be allocated over one or more frames. The start of the multiframe is determined by inverting the frame word, and the M bits are constituted by 48 bits. M bits M1 to M3 indicate test control bits, M4 indicates a line maintenance bit, and M5 and M6 are CRC bits for checking error bits.

FIG. 3 is a diagram showing a frame structure of a main signal at a transmission rate of 6 Mb / s, which is an output signal of the 2B1Q terminal package according to the present invention. Referring to FIG.
Although the main signal has 96 TSs, information of 2B + D is written only in TS1 to TS3, and the remaining TSs are empty. Therefore, the M bits are set to 8 using the four bits that are empty bits in the D channel of TS3.
It is composed of multiple frames. Frame 6 indicates a maintenance bit required for the overhang apparatus, and frames 7 and 8 indicate a synchronization frame for determining a multi-frame.
The CRC check bits M5 and M6 forming the multi-frame of the 2B1Q transmission signal shown in FIG.
It is not transferred between multiplexers.

On the other hand, the 6 Mb / s internal signal input from the internal interface and separated by the 6 M separation / conversion unit 7 is processed according to the processing speed of the 2B1Q termination generating unit 9.
The speed is converted to Mb / s. As for the internal signal of 2 Mb / s, the M-bit extracting section 13 extracts bits 3 to 6 of the D region of the main signal composed of 3TS as M bits according to a predetermined timing signal. The extracted M bits are used when generating the 2B1Q transmission signal.
Output to In the 2B1Q termination generation unit 9, 2Mb
/ S, which processes the main signal of 3TS composed of the in-device signal and the M bits extracted by the M bit extraction unit 13 and supplied via the CPU 17, to construct a frame constituting the 2B1Q transmission signal shown in FIG. I do. The constructed 2B1Q transmission signal is input to the 2W / 4W conversion unit 8 and output to a switching line or a subscriber line which is a two-wire type line.

The supervisory control interface unit 16 includes 2B1
The Q termination package 5 communicates with a centralized control monitoring unit provided in a 6M multiplexer with respect to a monitoring control signal.
Execute according to a predetermined procedure. The CPU 17 has 2B
It controls the 1Q termination function, M-bit insertion / extraction function, monitoring control function, and the like.

Next, the function of inserting and extracting M bits according to the present invention will be described in more detail.

FIG. 4 is a block diagram showing an embodiment of the M-bit insertion unit according to the present invention. FIG. 2 shows a bit holding unit 18 that holds each bit of EOCa1 to EOCdm constituting M bits input from the 2B1Q transmission signal through the CPU by the 2B1Q termination generation unit at the operation timing of the bit holding signal; A first SEL unit 19 that converts the M bits into serial data bit by bit at the operation timing of the bit selection signal and outputs the serial data, a bit selection unit 20a composed of the two, and an EOC that configures the M bits
The bit selector 20b processes the bits i1 to EOCi4 in the same manner as the bit selector 20a, and the bit selector EOCi5 to EOCi8 configure the M bits.
0a, and each bit of M40 to M43 forming M bits is assigned to the bit selection unit 2c.
0a, and each bit of M44 to M47 constituting M bits is assigned to the bit selection unit 2d.
0a, a bit selector 20f that processes each bit of START to DEAD constituting M bits in the same manner as the bit selector 20a,
A bit selection unit 20 that processes each bit of a fixed pattern of 1 and 0 constituting a bit in the same manner as the bit selection unit 20a
g, 20h, a second SEL unit 21 that converts the output of the bit selection unit of the eight circuits into serial data for each bit at the operation timing of the frame selection signal, and outputs the serial data.
The output of the EL section 21 is constituted by a main signal and a third SEL section 22 which adds the output to the main signal according to the operation timing of the M-bit selection signal.

The operation of FIG. 4 will be described. In the bit selection unit, M bits separated by the 2B1Q termination generation unit and input via the CPU are held by a bit holding signal to hold for 8 frames. And then 4 per frame
Bits are output one by one at the operation timing of the bit selection signal. In the bit selection unit 20a, EOCa
Each bit of 1, EOCa2, EOCa3, and EOCdm is sequentially output at a predetermined timing. The bit selection signal generated by the 2B1Q termination package is made up of a 2-bit signal and selects 4-bit data. Therefore, if the 2-bit bit selection signal is "00", EOCa1
Is selected, EOCa2 is set to "01", EOCa3 is set to "10", and EOCdm is set to "11". Further, in the bit selection units 20b to 20h, similarly, the input M bits, 4 bits per frame, are output one bit at a time at the operation timing of the bit selection signal. Next, the outputs of the bit selection units 20a to 20h are output to the second SEL.
The signal is input to the section 21 and is selectively output in units of 4 bits per frame in accordance with 8 multiframes forming M bits at the operation timing of the frame selection signal. The frame selection signal generated by the 2B1Q termination package is composed of a 3-bit signal, and selects 8 frames. Therefore, if the 3-bit frame selection signal is "000", the bit selection unit 20a selects 4 bits output from the bit selection unit 20a to configure the frame 1, and if the frame selection signal is "001", the bit selection unit 20b configures the frame 2. Selects the 4 bits to be output. Thereafter, similarly, the selection is sequentially performed up to the bit selection unit 20h configuring the frame 8 in which the 3-bit frame selection signal is “111”. Therefore, M bits having a 32-bit configuration are obtained as serial data from the first bit of frame 1 to the fourth bit of frame 8. Further, this serial data is input to the third SEL unit 22 and added to the main signal for each frame at the operation timing of the main signal for selecting the D region of the 1-bit main signal and the M-bit selection signal. Thus, 4 bits are inserted for each frame into the third to sixth bits, which are empty bits in the D area provided in the TS3 of the main signal.

FIG. 5 is a block diagram showing an embodiment of the M-bit extracting unit according to the present invention. The figure shows selection pulse generators 23a to 23a-2 that generate a signal for selecting M bits using a clock signal, a bit selection signal, and a frame selection signal.
3d, flip-flop units (hereinafter, referred to as F / F units) 24a to 24d that hold and extract a predetermined M bits according to the timing at which the M-bit selection signal operates, and a bit extraction unit 25a configured by the two. It is composed of bit extraction units 25b to 25h that generate an M-bit selection signal and hold and extract predetermined M bits.

The operation of FIG. 5 will be described. In the selection pulse generators 23a to 23d, a selection pulse signal is generated in order to identify and extract each bit constituting M bits added to the received main signal. Therefore, a bit selection signal having a 2-bit configuration for selecting 4 bits constituting each frame of M bits, a frame selection signal signal having a 3-bit configuration for selecting each frame constituting 8 M-frames of M bits, and 2M A selection pulse signal for specifying each of the 32 bits forming the M bits is generated by combining with the clock signal. Regarding EOCa1 which is the first bit of frame 1 constituting M bits,
When the bit selection signal of the selection pulse signal output from the selection pulse generation unit 23a is “00” and the frame selection signal is “000”, the F / F is determined based on the main signal specified and received.
The data is extracted by the unit 24a and output to the 2B1Q termination generating unit via the CPU. Similarly, for EOCa2, which is the second bit of frame 1 that constitutes M bits, the bit selection signal of the selection pulse signal output by the selection pulse generation unit 23b is “01” and the frame selection signal is “00”.
When the signal is "0", the F / F 24
b, and EOCa3, which is the third bit of frame 1 forming M bits, is selected by the selection pulse generator 23.
The bit selection signal of the selection pulse signal output by c is "1"
0 ", and extracted from the received main signal to the F / F section 24c when the frame selection signal is" 000 ",
E, which is the fourth bit of the first frame constituting M bits
Regarding OCdm, the main signal specified and received when the bit selection signal of the selection pulse signal output by the selection pulse generation unit 23d is “11” and the frame selection signal is “000” is transmitted to the F / F unit 24d. Extract and CPU respectively
To the 2B1Q termination generation unit via Further, bit extraction units 25b to 25 for extracting bits of frames 2 to 8
Similarly, for h, a predetermined selection pulse signal is generated to select M bits, and the predetermined bits of the main signal are held by the F / F unit at the obtained timing to extract the M bits.

As described above, M bits can be inserted and extracted, and the M bits of the 2B1Q transmission signal can be transferred between the overhanging devices.

[0029]

According to the present invention, as described above, claims 1 and 2
In both cases 3 and 3, when relaying M bits, which is a monitoring control signal used in the 2B1Q transmission line, to an empty bit of the 2B + D D channel constituting the main signal when relaying by an overhanging device or the like, This eliminates the need for a dedicated TS, increases the line use efficiency between the overhanging devices, and can exert a great effect in operating the overhanging device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a monitoring control signal transfer method for an overhang device according to the present invention.

FIG. 2 shows a frame configuration diagram of a 2B1Q transmission signal.

FIG. 3 is a diagram illustrating a frame configuration of a main signal at a transmission rate of 6 Mb / s, which is an output signal of a 2B1Q termination package according to the present invention.

FIG. 4 is a configuration diagram illustrating an embodiment of an M-bit insertion unit according to the present invention.

FIG. 5 is a configuration diagram showing an embodiment of an M-bit extraction unit according to the present invention.

FIG. 6 is a configuration example of a transmission system provided with a conventional overhanging device.

FIG. 7: 6 Mb / s used between conventional overhangers
It is a figure which shows the frame structure of the main signal by the transmission rate of s.

[Explanation of symbols]

1. Switch, 2, 3, overhanging device, 4. DSU, 5. 2B1Q termination package, 6. 6M multiplex conversion unit, 7. 6M separation conversion unit, 8. 2W / 4W conversion unit , 9 ·· 2B1Q termination generation unit, 10 ·· M bit insertion unit, 11 ·· 2M / 6M conversion unit, 12 ·· 6M / 2M conversion unit, 13 ·· M bit extraction unit, 14 ··· first port , 15 second port, 16 monitor control interface section, 17 CPU, 18 bit storage section, 19 first SEL section, 20a, 20b, 20c, 20d, 20e, 20f, 2
0g, 20h bit selection section, 21 second SEL section, 22 third SEL section, 23a, 23b, 23c, 23d selection pulse generation section, 24a, 24b, 24c, 24d. F / F section, 25a, 25b, 25c, 25d, 25e, 25f, 2
5g, 25h bit extraction unit

Claims (3)

[Claims] An overhang apparatus for relaying a subscriber line accommodated in an exchange and inputting / outputting a subscriber transmission line signal to / from a digital service unit, wherein synchronization of the subscriber transmission line signal received from the exchange or the digital service unit is performed. By establishing, the subscriber transmission path signal is terminated, the supervisory control bit provided in the control channel constituting the subscriber transmission path signal is separated, and user data which is a main signal transmitted between the overhanging devices. The supervisory control bit of the subscriber's transmission path signal is added to the vacant bits of the D channel constituting 2B + D of the channel and transferred to the opposing pier, and the opposing pier constitutes the received user channel 2B + D. The monitoring control bits of the subscriber transmission path signal added to the vacant bits of the D channel are extracted and transmitted to the subscriber. A surveillance control signal transfer method for an overhanging device, wherein a frame of a subscriber transmission line signal is reconstructed by adding it to a control channel constituting a transmission line signal and output to the digital service unit or the exchange. 2. A surveillance device supervisory control signal transfer system according to claim 2, wherein said subscriber transmission line signal is a 2B1Q echo canceller transmission signal. 3. An overhang apparatus monitoring and control signal transfer system, wherein the overhang apparatus is a multiplexing apparatus.