JPH06164533A - Synchronous terminal station device - Google Patents

Abstract

PURPOSE:To close a line without increasing a signal line even if the line of a channel unit is set. CONSTITUTION:At the time of setting the line of the channel unit in the system, a terminal means 4 which a line setting means 12 has monitors an ST frame and detects the presence or absence of an alarm in a handling group (HG) unit. When the alarm of the HG unit is given from the terminal means 4, a signaling bit fixing means 6 transferring a signaling bit in the channel unit fixes the signaling bit to a prescribed content in the channel unit, transfers it to the corresponding line and transmits line closure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous terminal device capable of blocking a line based on alarm information such as transmission line abnormality even when a line is set for each channel.

[0002]

2. Description of the Related Art Digitization is progressing in a communication network of a user having a self-employed communication network, and in such a communication network of a user, a terminal device is used to link transmission lines.

That is, each terminal device is designed to make a fixed connection between specific terminals using a specific channel, and to enable communication between the specific terminals using the channel. is there.

As described above, the terminal device is provided between the transmission line and the terminal, and a specific channel is fixedly set for use in communication between the specific terminals to perform data transmission. Device, but in recent years digitalization has progressed,
Even in the line setting circuit (TSI; Time Slot Interchanger) provided inside the terminal equipment for setting the line connection, the line setting can be changed electronically without changing the digital signal. became.

The digitized terminal station apparatus is called a synchronous terminal station apparatus, and the synchronous terminal station apparatus is constructed as shown in FIG. In the figure, 11 is a transmission line interface, 12 is a multiplexing processing unit, and 13 is a terminal interface. Among these, the transmission line interface 11 is a transmission line L using an optical fiber or the like, a digital radio device, etc., and a multiplexing processing unit. 1
It is an interface with 2.

The transmission line interface 11 has a function of terminating a signal from the transmission line L or the like and unifying it to a frame phase in the device. The transmission line interface 11 is a PCM.
Synchronous multiplex interface for primary and secondary groups, PCM secondary group and ternary multiplex conversion unit by stuff multiplex system, optical fiber interface up to PCM tertiary group, etc. can do.

Incidentally, the 1.5M IF (11a) in the figure is a synchronous multiplex interface having a transmission rate of 1.5 Mbps,
The 6.3M IF (11b) is a synchronous multiplex interface with a transmission rate of 6.3 Mbps, and a 6.3M STF IF.
(11c) is a stuff multiplex interface with a transmission rate of 6.3 Mbps, and 32M STF IF (11d) is 3
Stuff multiple interface with a transmission rate of 2 Mbps,
The 32M optical IF (11e) is an optical interface having a transmission rate of 32 Mbps, and the 6.3M optical IF (11f) is 6.3M.
Optical interface with bps transmission rate, 1.5M optical IF
(11g) is an optical interface having a transmission rate of 1.5 Mbps. Also, the multiplexing processing unit 12 is a multiplexing / demultiplexing unit 12
-3, 12-4 and line setting circuits 12-1, 12-2 for 6 channels and 1 channel.

The multiplexing processing unit 12 separates the received multiplexed frame from each transmission line or the like input from the transmission line interface 11 into data of a line setting unit (6 channels or 1 channel), and the line setting circuit 12 -1, 12-2 are sorted into corresponding distribution destinations based on the line settings, and are multiplexed for each distribution destination and given to the corresponding interface unit in the terminal interface 13.
When the multiplexed frame sent from each interface unit in (1) is separated into data of a line setting unit, sorted by distribution destination, multiplexed by distribution destination, and output to the corresponding interface in the transmission path interface unit 11. It does the operation that I said.

The terminal interface 13 terminates signals from terminals such as a digital exchange, a video encoder, a voice terminal, and a low-speed data terminal, and unifies them into a frame phase in the apparatus. The terminal interface 13 has a voice 4-line I for interfacing with an analog exchange.
F (voice 4-wire interface) 13a, voice 2-wire IF
(Voice 2-wire interface) 13b, 2M IF (interface with a transmission rate of 2 Mbps) 13c for interfacing with a digital exchange, low-speed data IF
There are (low-speed data interface) 13d, an intra-station line terminating device 13e, and the like.

When data is transmitted from a terminal having such a configuration, the transmission data from the terminal is sent to the multiplexing processing section 12 through the interface connected to the terminal in the terminal interface section 13, and the terminal is processed. Is multiplexed with the frame of the corresponding destination of the used channel and is sent to the interface of the destination of the transmission path interface unit 11. Then, it is transmitted via the interface.

A received frame from a certain transmission line is received via an interface corresponding to the transmission line in the transmission line interface unit 11, is sent to the multiplexing processing unit 12, and is set by the multiplexing / demultiplexing unit 12-4. After the data is separated into units, it is sorted into corresponding distribution destinations for each line setting unit based on the line settings in the line setting circuits 12-1 and 12-2, and multiplexed by the multiplex / separation unit 12-3 for each distribution destination. It is converted and given to the corresponding interface unit in the terminal interface 13, and sent from the interface unit to the terminal.

If the above-mentioned certain terminal is a telephone, the exchange which accommodates the telephone recognizes the called party based on the dial information by dialing, and if the call is to the extension accommodated by the exchange, the extension is received. However, if the call is to a line outside the exchange, the channel assigned to that line is used to send dial information, and the multiplexing processing unit 12 sends the data from this channel in advance. The data is sorted according to the semi-fixed setting state, multiplexed in the frame to the destination line, and sent to the interface corresponding to the destination line accommodation switch in the transmission line interface unit 11 or the terminal interface unit 13. Then, the signal from the called party follows the reverse route and is sent to the telephone set of the calling party.

In this way, each channel is sorted so as to be transmitted to a desired destination,
Although communication can be performed between specific terminals, on the other hand, in addition to channel transmission data, signaling bits that are dial information are multiplexed and transmitted in a transmission frame. Then, the signaling bit is transmitted using the ST frame which is a frame for transmitting the signaling bit.

In the synchronous terminal device, the minimum handling unit is 6 channel units or 1 channel unit. Usually, data for 6 channels is collectively called HG (Handling Group).

In each frame, 1-bit ST frame transmission bit for 6-channel data is prepared, F bit for frame synchronization, and B bit for call bit.
Bits are added, and a set of 8 HGs forms an ST frame. Further, the ST frame can be used for transmission of alarm information, and for example, by handling all the bits corresponding to the same HG when collecting 8 frames of the ST frame (all the bits in the vertical column in the figure) to “1”,・
AIS can be sent in group units (6 channels).

Therefore, when the line is set in units of 6 channels, the ST frame can be exchanged for the corresponding bits and sent to the interface to be transmitted in the terminal interface unit or the transmission line interface unit. The alarm can be transmitted at.

However, when the channel setting is performed in units of one channel, the corresponding signaling bits of the ST frame are distributed and sent for each channel.
Since it is not possible to give the entire ST frame sent in group units to each channel, it is not possible to convey an alarm in handling group units.

In the ST frame, the bit data string is all "1" so that the AIS signal (Alarm Indi
Also used as a cation signal. That is, when data cannot be exchanged due to an abnormality in the transmission path, the ST frame is a bit data so that the monitoring device of the device on the transmission downstream side gives an alarm to the downstream side device. Send an AIS signal with all "1" s in the row.

By the way, in order to be able to identify whether a line is available or not in a telephone line, the line is blocked when the line is unavailable, and when it is available. Release the line block. Then, this is identified by the signaling (SR) output (“ground” or “open”) when the line is blocked.

In the synchronous terminal equipment, the line blocking is 4W.
(4-line) interface or other terminal interface unit 13
In the conventional synchronous terminal device, since the frame is transmitted to the terminal interface unit 13 via the multiplexing processing unit 12, the signaling (S
R) cannot be transmitted to the terminal interface unit 13.

That is, the line blocking in the synchronous terminal device is 4
This is a configuration performed by a line blocking circuit provided in each terminal interface such as a W (4-line) interface, and the line blocking signaling is sent to the synchronous terminal device by the ST frame.

In this way, in the case of performing the line setting for each channel, ST is set in the line setting circuit of the multiplexing processing section.
Since the frame is terminated, the alarm information of the line blocking sent by using the entire ST frame is not transmitted to the terminal interface.

In order to transmit the alarm information for blocking the line to the terminal interface, it is necessary to provide a signal line for transferring the alarm information. In this case, all the lines from the line setting circuit to the terminal and the transmission line are required. Since it is necessary to provide a signal line for the interface and also a line blocking circuit for all the interfaces, there arises a problem that the line scale becomes large when the entire device is viewed.

[0024]

As described above, in the conventional apparatus, the line blocking circuit is provided in the terminal interface section, and the line blocking information is transmitted by the ST frame, and the transmission of 6 channels is handled. -It is as a group (HG), and in this HG, in addition to 6 channels, 1 bit is added for ST frame transmission,
This 1 bit is used for ST frame transmission. And
Set all channels in HG to one line,
Alternatively, the line can be set for each channel.

On the other hand, since the alarm is transferred in units of handling groups, the entire ST frame is used for transmission in the channel setting in which the ST frame is separated for each channel and the signaling information is distributed. The information on the line blocking cannot be transmitted, and the signaling (SR) output (“ground” or “open”) at the time of line blocking cannot be selected for each channel.

In order to make it possible to select the signaling output at the time of line blocking for each channel, it is necessary to provide a signal line for alarm information transfer to all interfaces. Therefore, the number of signal lines for delivery between the terminal and each interface section of the transmission line and the line setting circuit increases, and there remains a problem that the circuit scale becomes large when viewed as the entire device.

Therefore, the object of the present invention is to
When line setting is performed in 1-channel units, line blocking information can be transmitted without the need for a signal line for passing between the line setting circuit and each interface section. An object of the present invention is to provide a synchronous terminal device capable of blocking a line.

[0028]

In order to achieve the above object, the present invention is configured as follows. That is, while transmitting data for a predetermined channel using a data signal having a capacity for a predetermined plurality of channels as a unit of transmission,
Each channel has a line setting means for setting a line so that each channel or a plurality of channels is assigned to communication with a desired partner terminal, and the signaling information bit assigned to each channel of the data signal of the transmission unit is set. The ST frame for transmission is also used as alarm information by fixing the signaling information bit of each channel to a predetermined bit content for each transmission unit, and the signaling information is provided to the interface with the terminal for each channel. In the synchronized terminal device, when the line setting is performed in the line setting means, the S
Termination means that separates and outputs the signaling information corresponding to each channel of the T frame, detects the presence or absence of an alarm state by judging the contents of the ST frame, and normally outputs each channel among the outputs of this termination means. Means for switching the signaling information corresponding to each channel to alarm information fixed to a predetermined bit content and giving it to the interface when the corresponding signaling information is selected and the ST frame indicates an alarm state, and The interface is provided with means for blocking the line when receiving the alarm.

[0029]

The synchronizing terminal device transmits data of a predetermined channel by using a data signal having a capacity of a plurality of predetermined channels as a unit of transmission, and each channel has a desired partner for each channel or each channel. The line is set to be allocated to communication with the terminal and used for communication between desired terminals. However, in the above-mentioned configuration, when the line is set for each channel, the terminating means provided in the line setting means is The signaling information corresponding to each channel of the ST frame is separated and output, and the contents of the ST frame are judged to detect the presence or absence of the alarm state and output. Then, the line setting means normally selects the signaling information corresponding to each channel from the output of the terminating means, and the ST
When the frame indicates an alarm state, the signaling information corresponding to each channel is switched to alarm information having a fixed bit content and given to the interface, and when the interface receives the alarm, the line is blocked.

As described above, the synchronizing terminal apparatus transmits data of a predetermined channel by using a data signal having a capacity of a plurality of predetermined channels as a unit of transmission unit (HG; handling group), and each channel has 1 It is used for communication between specific terminals by setting a line so that each channel or a plurality of channels are allocated for communication with a desired partner terminal, and signaling information of each channel in HG units is transmitted by ST frame. , This ST frame is transmitted by using 1 bit added in HG units, and is delivered to the corresponding line according to the line setting.
This ST frame is also used for alarms such as AIS in HG units, but in this system, when line setting is performed in 1-channel units, the ST frame is monitored to detect the presence or absence of an HG unit alarm, and an HG unit alarm is issued. If there is a line, the signaling bit is fixed to “0” or “1” for each channel, and it is transferred to the corresponding line according to the line setting to transmit the line blockage. The line can be blocked without the need for a signal line for exchanging the alarm signal with each interface unit, and even if the line is set for each channel.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention and corresponds to the line setting circuits 12-1 and 12-2 in the synchronous terminal station device shown in FIG. In FIG. 1, 1 is a main signal data memory, 2 is a frame counter for counting one frame, and 3 is an address control memory. Reference numeral 4 is an ST frame terminating circuit, 5 is a signaling line setting data memory, 6 is a signaling bit fixing circuit, 7 is a multi-frame counter for counting 16 frames, and 8 is an ST multiplex circuit for performing ST frame reorganization. .

Reference numeral 101 is an input main signal, which is an audio signal, a video signal or a data signal to be transmitted.
This input main signal 101 is sent from the multiplexer / demultiplexer 12-3 or 12-4 in FIG. 3 in units of 8 bits per channel.
A write address signal 102 is output from the frame counter 2, and a read address signal 103 is output from the address control memory 3.

Reference numeral 104 is an output main signal, which is output from the data memory 1. Further, 105 is an input ST signal (ST
The signal means a signal having a function of indicating completion of transmission of the selection signal. Further, the selection signal indicates a signal that carries a selection intention for guiding in a required direction, such as the type of service and the number of the receiving terminal. ), The demultiplexing unit 12-3 or 12-4 in the multiplexing processing unit 12 of FIG. 3 demultiplexes the ST frame.

Reference numeral 106 is an ST signal write address, S
This is an address output from the T frame termination circuit 4. 10
Reference numeral 7 denotes an ST signal after the synchronization pull-in, which is output from the ST frame termination circuit 4, and reference numeral 108 denotes an ST-related alarm detection signal which is output from the ST frame termination circuit 4.

Reference numeral 109 denotes an ST signal after line setting, which is output from the signaling line setting data memory 5.
Reference numeral 110 denotes an ST-related alarm signal after line setting, which is output from the signaling line setting data memory 5. 111 is signaling bit fixed information, which is output from the address control memory 3. Reference numeral 112 denotes a signaling signal after line blocking processing, which is output from the signaling bit fixing circuit 6, and 113 is an ST multi-frame count signal, which is output from the ST multi-frame counter 7. Reference numeral 114 is an output ST signal output from the ST multiplexing circuit 8.

The frame counter 2 corresponds to the transmission rate of the main signal, operates sequentially in synchronization with the frame of the main signal, and operates so as to make one round of the count value in one cycle of the frame. The count value of the frame counter 2 is given to the data memory 1 as an address signal.

The address control memory 3
Is a memory for storing the line setting data, and stores the data for distributing the data taken in the data memory 1 to the destinations to be delivered.

That is, the address control memory 3 uses the write address signal 102, which is the output of the frame counter 2, as a read address to read the data corresponding to the address and outputs it as the address signal 103. According to the demultiplexer / demultiplexer 12
-3 or 12-4 (Fig. 3) corresponds to the write address which is the output of the frame counter 2 and indicates the storage address of the data to be given to the terminal interface or transmission line interface to which the current time slot is assigned. It is possible to select the data of the main signal to be sent out in the time slot at that time in correspondence with the write address signal 102.

Further, the address control memory 3
The signaling bit fixed information 111 is written in the address position selected when the time slot position for storing the signaling bit arrives, and when the address signal 103 has a value corresponding to this address position, this address control memory The read data from 3 becomes signaling bit fixed information 111. This signaling bit fixed information 111 is given to the signaling bit fixed circuit 6.

When the signaling bit fixing circuit 6 receives the signaling bit fixing information 111, it outputs the signaling (ST signal) 109 read from the signaling line setting data memory 5 to the ST related alarm signal 110 of the ST frame including the signaling bit. Is an alarm state, it is fixed to "0" (or may be "1") (line closed) and output to the ST multiplex circuit 8.
When the ST-related alarm signal 110 is not in the alarm state, the signaling 109 is directly output to the ST multiplex circuit 8. The output of the signaling bit fixing circuit 6 is the signaling signal 11 after line setting and line blocking processing.
It becomes 2.

Further, the data memory 1 receives the count value of the frame counter 2 as an address signal and stores the data of the input main signal 101 at an address corresponding to the address signal.

The ST frame terminating circuit 4 is a circuit for detecting the ST frame synchronization pull-in and the alarm regarding the ST frame, and for the ST frame separated and outputted from the multiplexing / separating unit 12-3 or 12-4. It takes in a bit signal and generates a sequentially changing address signal so that the ST bit number (No.), the bit number within the ST frame (No.), etc. can be associated with the corresponding signaling bit. This is output as the ST write address 106, the ST signal 107 is separated and output, and it is detected in the alarm state from the content of the signaling bit whether or not the alarm signal is in the ST state.
It has a function of outputting the related alarm detection signal 108.

Further, the signaling line setting data memory 5 stores the ST signal 107 and the ST-related alarm detection signal 108 at an address corresponding to the ST write address 106, and also outputs the read address signal 103 from the address control memory 3. In response, the ST signal 107 and S stored at the address of the address signal 103 are received.
A signal for outputting a T-related alarm detection signal 108 for holding and outputting a signaling bit (ST signal) corresponding to the channel to which the data currently being read from the data memory 1 belongs, and the signaling When the ST frame including the bits is in the alarm state, the ST-related alarm signal 110 is output.

The multi-frame counter 7 counts for control necessary for performing multiplexing in accordance with ST multi-frames, and ST frames are multiplexed and transmitted / received. Therefore, timing is adjusted in accordance with this. Is a counter for. The ST multiplex circuit 8 outputs the ST multiframe count signal 113 output from the multiframe counter 7.
According to the above, the signaling signal 112 after the line setting and line blocking processing is reorganized into ST frames and output as the output ST signal 114.

The output ST signal 114 is sent together with the output main signal 104 to the multiplexer / demultiplexer 12-3 or 12-4 in FIG. 3, where it is multiplexed and sent to the terminal interface unit 13 and the transmission line interface unit 11. Each interface in the terminal interface unit 13 and the transmission line interface unit 11 receives the data sent in the time slot assigned to it and sends it out to the terminal or the transmission line.

The above is the configuration of the line setting circuit in this system, but in this system the terminal interface unit 1
3 or the interface in the transmission line interface unit 11 when the line blocking detection is required, the line setting circuit
12-1.12-2 Monitor the signaling signal 112 after line setting and line blocking processing from the side, and if it is fixed at "0" (or "1"), recognize that line is blocked and block the line. A control means CNT for controlling the state is provided.

Specifically, in the case of the 4W interface, as shown in FIG. 2, a control means CNT and a driver DR for controlling the SR line to the line blocking state and releasing the line blocking state by the control means CNT are provided. Is output as ground and open.

In the present apparatus having such a configuration, the frame counter 2 uses the main signal (multiplexed with the audio signal, the video signal, etc.).
It corresponds to the transmission rate of the separating unit 12-3 or 12-4), and the count is sequentially advanced in synchronization with the frame of the main signal, and the count value is cycled once in one cycle of the frame. The count value of the frame counter 2 is given to the data memory 1 as an address signal.

Therefore, first, regarding the main signal system, the data of the input main signal 101 is sequentially addressed to the data memory 1 addressed by the sequential write address signal 102 which is the output of the frame counter 2 in correspondence with the specified address. The line setting is performed by writing the data, and the address signal 103 from the address control memory 3 is used as the read address to read the data corresponding to this address, and the line is set and output as the output main signal 104.

The address control memory 3 outputs the write address signal 10 which is the output of the frame counter 2.
The data corresponding to the address is read by using 2 as a read address and is output as the address signal 103, and stores the data to be given to the terminal interface or the transmission line interface to which the current time slot is assigned according to the line setting. Data indicating an address is written corresponding to the write address which is the output of the frame counter 2, and therefore, the data of the main signal to be sent out in the time slot at that time is selected corresponding to the write address signal 102. You can

The output main signal 104 read out from the data memory 1 in this manner is the multiplexer / demultiplexer 12-4 or 12-3.
To the terminal interface unit 13 or the transmission line interface unit 11 in FIG.

Next, regarding the ST signal system, the signaling bits of the ST frame separated by the multiplexer / demultiplexer 12-3 or 12-4 in FIG.
It is input to the frame termination circuit 4.

Then, the ST frame termination circuit 4 first responds to each input of the input ST signal 105 by a signal (ST frame number (No.), bit number (No.) in ST frame, etc.) necessary for signaling bit identification. Address of ST
The write address 106 is output to the signaling line setting data memory 5, the signaling bit is monitored, and the ST signal 107 and the ST-related alarm detection signal 10 are output.
8 is output. The ST-related alarm detection signal 108 is output to the signaling line setting data memory 5 when the signaling bit is in the alarm state.

As a result, the ST signal 107 and the ST-related alarm detection signal 108 are written in the address corresponding to the ST frame number and the ST frame bit number in the signaling line setting data memory 5.

On the other hand, the address control memory 3
The read address 103 corresponding to the current time slot from is input to the signaling line setting data memory 5, so that the ST signal 107 corresponding to the current time slot from the signaling line setting data memory 5, The ST-related alarm detection signal 108 is read.

The signaling (ST signal) 109 read from the signaling line setting data memory 5 is given to the signaling bit fixing circuit 6, and the signaling bit fixing circuit 6 includes the signaling bit of the given signaling 109. ST of ST frame
When the related alarm signal 110 is in an alarm state (although the ST frame is set to all "1" or all "0", an alarm is transmitted in handling group units, the contents of the ST frame are all "1" or all "0". "0"), fixed to "0" (or "1") at the output timing of the signaling bit fixed information 111 (line block)
Output to the ST multiplexing circuit 8. ST-related alarm signal 11
Signaling provided when 0 is not in alarm 10
9 is output to the ST multiplex circuit 8 as it is.

That is, since the signaling bit fixed information 111 is written in the address control memory 3 at the address position selected when the time slot position for storing the signaling bit arrives,
When the address signal 103 has a value corresponding to this address position, the read data from the address control memory 3 is given to the signaling bit fixed circuit 6 as the signaling bit fixed information 111.

When the signaling bit fixed information 111 is received, the signaling bit fixed circuit 6 sends the signaling 109 to the S including the signaling bit.
When the ST-related alarm signal 110 of the T frame is in the alarm state, it is fixed to "0" or "1" (line closed) and output to the ST multiplex circuit 8. When the ST-related alarm signal 110 is not in the alarm state, The given signaling 109 is output as it is. In this way, the output is given from the signaling bit fixed circuit 6 to the ST multiplexing circuit 8 as the signaling signal 112 after the line setting and line blocking processing.

In the ST multiplexing circuit 8, the signaling signal 112 after line setting and line blocking processing is reorganized into ST frames in accordance with the ST multiframe count signal 113 from the multiframe counter 7 and output ST signal 1
It outputs as 14. Then, the output ST signal 114 is sent to the terminal interface section or the transmission path interface section via the multiplexing / demultiplexing section 12-4 or 12-3 in FIG.

Therefore, for example, the SR system in the telephone network which receives this (system in which the transmission line / reception line is independent)
In the 4W interface section, which is the interface of the above, if the SR line is output as ground or open according to the bit content “0” or “1” of the signaling bit from the line setting circuit shown in FIG. You will be able to do it.

As described above, the synchronizing terminal device transmits data of a predetermined channel by using a data signal having a capacity of a predetermined plurality of channels as a unit of transmission unit (HG; handling group), and each channel has 1 A line is set so that each channel or a plurality of channels is allocated to communication with a desired partner terminal, and used for communication between desired terminals. Also, signaling information of each channel in HG units is added in HG units. Bit ST frame transmission bit is used for transmission and is delivered to the corresponding line according to the line setting. This ST frame is also used for alarms such as AIS in HG units. When the line is set for each channel, the ST frame is monitored to detect the presence / absence of an HG unit alarm, and if there is an HG unit alarm. Fixes the signaling bit to "0" or "1" for each channel and delivers it to the corresponding line according to the line setting, so that the line setting circuit and each interface unit are transmitted. Means that the signal line for passing the alarm signal is not required, and the line can be blocked even if the line is set for each channel. The present invention is not limited to the embodiments described above and shown in the drawings, but can be appropriately modified and implemented within the scope of the invention.

[0063]

As described above, according to the present invention, 1
When the line is set for each channel, the line blockage information can be transmitted without the need for a signal line for passing between the line setting circuit and each interface, and the line can be set for each channel. It is possible to provide a synchronous terminal device capable of blocking.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part configuration showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a terminal interface to which the present invention is applied.

FIG. 3 is a block diagram showing a schematic configuration of a synchronization terminal device.

[Explanation of symbols]

1 ... Data memory for main signal, 2 ... Frame counter, 3
... address control memory, 4 ... ST frame termination circuit, 5 ... signaling bit fixed circuit, 7 ... multi-frame counter, 8 ... ST multiplex circuit, 11 ... transmission line interface, 12 ... multiplex processing section, 12-1, 12- Two
... Line setting circuit, 12-3, 12-4 ... Multiplexing / separating unit,
13 ... Terminal interface, 101 ... Input main signal, 10
2 ... write address signal, 103 ... read address signal, 104 ... output main signal, 105 ... input ST signal, 10
6 ... ST signal write address, 107 ... ST signal after synchronous pull-in, 108 ... ST-related alarm detection signal, 109 ...
ST signal after line setting, 110 ... ST related alarm signal after line setting, 111 ... Signaling bit fixed information, 11
2 ... Signaling signal after line blocking process, 113 ... ST
Multi-frame count signal, 114 ... Output ST signal,
DR ... Driver, CNT ... Control means.

Claims (1)

[Claims] 1. Data is transmitted for a predetermined number of channels using a data signal having a capacity for a predetermined number of channels as a unit of transmission, and each channel is connected to a desired partner terminal on a channel-by-channel or channel-by-channel basis. The ST frame for transmitting a signaling information bit assigned to each channel of the data signal of the transmission unit has a channel setting means for setting a line to be assigned to communication, and the signaling information bit of each channel is assigned to the transmission unit. Is used as alarm information by fixing to a predetermined bit content, and the signaling information is given to the interface with the terminal for each channel. Information for each channel of the ST frame when performing And termination means for detecting and outputting presence or absence of determination to the warning state the contents of ST frame with separating and outputs,
Of the outputs of the terminating means, usually, the signaling information corresponding to each channel is selected, and when the ST frame indicates an alarm state, the signaling information corresponding to each channel is switched to the alarm information in which the predetermined bit content is fixed. Means for giving the interface to the interface, and means for blocking the line when the alarm is received, the synchronous terminal device.