JP2758747B2 - Digital line termination equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital line terminal, and more particularly to a digital line terminal having an alarm transmission (detection and insertion) function.

[0002]

2. Description of the Related Art A conventional digital line termination device is shown in FIG.
As shown in the figure, a frame synchronization unit 25 for inputting subscriber line data from the subscriber line data input terminal 21 and performing frame synchronization.
An information extracting unit 26 for extracting information in a frame, a buffer memory unit 27 for changing clocks, an information inserting unit 28 for inserting information in a frame, a frame inserting unit 29 for inserting a frame synchronization pattern, A frame synchronizing unit 34 for inputting terminal line data from the terminal line data input terminal 24 for frame synchronization; an information extracting unit 33 for extracting information in the frame; a buffer memory unit 32 for changing clocks; And an information insertion unit 31 for inserting a frame synchronization pattern.

First, the operation in the down direction will be described. The data input from the subscriber line data input terminal 21 is frame-synchronized by the frame synchronization unit 25, and alarm and status information arranged at predetermined positions in the frame are extracted by the information extraction unit 26. Further, the clock is changed to a clock in the device in the buffer memory unit 27. Further, status information and alarm information to be transmitted to the terminal side are inserted at predetermined positions in the frame by the information insertion unit 28, a frame pattern is added by the frame insertion unit 29, and the information is output from the terminal line data output terminal 22.

Next, the operation in the upward direction will be described. Data input from the terminal line data input terminal 24 is frame-synchronized by a frame synchronization unit 34, and alarm and status information arranged at a predetermined position in the frame are extracted by an information extraction unit 33. Further, the buffer memory unit 32 switches the clock to the internal clock, status information and alarm information to be transmitted to the subscriber side are inserted into a predetermined position in the frame by the information insertion unit 31, and the frame pattern is inserted by the frame insertion unit 30. The data is added and transmitted from the subscriber line data output terminal 23.

[0005]

However, in the conventional digital line terminator configured as described above, only the alarm and status information arranged at a predetermined position in the frame can be extracted and inserted. There is a problem that information and status information cannot be detected and inserted. SUMMARY OF THE INVENTION An object of the present invention is to provide a digital line terminal capable of detecting and inserting alarm and status information in a data area.

[0006]

The present invention achieves the above object.
In order to achieve this, the input
First frame synchronizing unit for synchronizing frame of input data
And extracting the information in the frame of the subscriber data.
1 information extraction unit and the clock of the first frame synchronization unit.
A first buffer memory unit for transferring a call;
First information insertion unit for inserting information into a frame of data
And inserting a frame synchronization pattern of the subscriber data.
And a first frame insertion unit,
To synchronize the frame of the input terminal line data.
2 in the frame of the terminal line data
A second information extracting unit for extracting information of the second
Second buffer memo for changing the clock of the
And inserting information into a frame of the terminal line data.
A second information insertion unit, and a frame for the terminal line data.
And a second frame insertion portion for inserting the initial pattern.
In a digital line termination device, the down direction of the line
The alarm information of the subscriber data
A first line control unit for outputting a signal, and the control signal
From the information extracted by the first information extracting unit,
Alarm detection that extracts alarm information from user data and issues an alarm
An output unit, and the terminal
The control signal is determined by determining the insertion area of the insertion data in the line data.
A second line control unit for outputting, and a second line control unit
An insertion data control unit that generates an alarm according to the control signal;
The insertion data control at the discrimination position of the second line control unit;
An alarm insertion unit that inserts a unit alarm into the terminal line data,
Is provided.

The position of the contracted line is determined by the first line control unit, and a control signal is sent to the alarm detection unit. Then, the alarm detector detects the alarm by monitoring the state of the corresponding time lot position and outputs the alarm from the alarm output terminal. The output of the second buffer memory unit is input to a second alarm insertion unit, a second line control unit, and an insertion data insertion unit.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, subscriber line data input to a subscriber line data input terminal 1 is input to a frame synchronization unit 6 for performing frame synchronization.
Next, it is input to an information extracting unit 7 for extracting status and alarm information at a predetermined position in the frame. The output of the information extracting unit 8 includes a buffer memory unit 8 for changing clocks, an alarm detecting unit 12 for extracting status and alarm information included in the data area of the subscriber line data, and a data area including the status and alarm information. Is input to the line control unit 11 that determines The output of the buffer memory unit 8 is input to an information insertion unit 9 for inserting status and alarm information at a predetermined position in a frame, and the output of the information insertion unit 9 is input to a frame insertion unit 10 for inserting a frame synchronization pattern. You.
The output of the frame insertion unit 10 is sent from the terminal line data output terminal 3 to the terminal.

[0008] The terminal line data input to the terminal line data input terminal 4 is input to a frame synchronizing section 18 for synchronizing frames, and then an information extracting section 17 for extracting status and alarm information at a predetermined position in the frame. Is input to The output of the information extracting unit 17 is input to the buffer memory unit 16 for changing the clock. The output of the buffer memory unit 16 is input to an alarm insertion unit 15 for inserting status and alarm information into a data area, a line control unit 20 for controlling a data insertion position, and an insertion data control unit 19 for generating insertion data. The output of the alarm insertion unit 15 is the information insertion unit 1 that inserts status and alarm information at a predetermined position in the frame.
4 and the output of the information insertion unit 14 is input to the frame insertion unit 13 for inserting the frame synchronization pattern.
The output of the frame insertion unit 13 is transmitted from the subscriber line data output terminal 2.

Next, the operation will be described. Here, an operation of detecting and inserting an SVA alarm (contract line data is all "1") is taken as an example (the contract line is a line provider and a line provider). Represents the line speed contracted with the line user,
It is indicated on the subscriber line data by the number of timeslots used and the method of use).

First, the operation in the downlink direction (receiving subscriber line data and transmitting it to the terminal) will be described. The frame synchronization unit 6 synchronizes the frame with the subscriber line data, and the information extracting unit 7 extracts the status and alarm information inserted at a predetermined position in the frame. Thereafter, the line controller 11 determines the position of the contracted line (corresponding to a time slot in the frame), and sends a control signal to the alarm detector 1.
Send to 2. The alarm detection unit 12 that has received the control signal
An alarm is detected by monitoring the state of the corresponding time slot position, and is output from the alarm output terminal 5. At this time, the monitoring target section (time slot) can be set to any position and length within the frame. After the output of the information extracting unit 7 is input to the buffer memory unit 8 and replaced with the internal clock, the information inserting unit 9 and the frame inserting unit 10 insert the status and alarm information and the frame synchronization pattern, respectively. It is output from the terminal line data output terminal 3.

Next, in the upstream direction (termination of terminal line data,
The operation of (transmitting to the subscriber side) will be described. The frame synchronization unit 18 synchronizes the frame with the terminal line data, and the information extraction unit 17 extracts the status and alarm information inserted at a predetermined position in the frame. Further, the clock is changed to the internal clock in the buffer memory unit 16. Here, when an alarm (here, SVA) is inserted, the position of the contracted line is determined by the line control unit 20, a control signal is sent to the insertion data control unit 19, and the insertion data control unit 1
In step 9, insertion data is generated. The insertion data generated by the insertion data control unit 19 is transmitted to the alarm insertion unit 15 according to the control signal.
Is inserted at a predetermined position (contract line position) in the frame. Thereafter, the information insertion unit 14 and the frame insertion unit 13
, The status and alarm information and the frame synchronization pattern are inserted, and are output from the subscriber line data output terminal 2.

[0012]

As described above, according to the present invention, by extracting and inserting the status and alarm information inserted in the data area in the frame, the alarm monitoring function conventionally provided in the terminal device can be digitalized. This has the effect that a line termination device can be used instead.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a digital line terminal according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional digital line termination device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Subscriber line data input terminal, 2 ... Terminal line data output terminal, 3 ... Subscriber line data output terminal, 4 ... Terminal line data input terminal, 5 ... Alarm output terminal, 6 ... Frame synchronization part,
7 ... information extraction unit, 8 ... buffer memory unit, 9 ... information insertion unit, 10 ... frame insertion unit, 11 ... line control unit, 1
2 ... Alarm detection unit, 13 ... Frame insertion unit, 14 ... Information insertion unit, 15 ... Alarm insertion unit, 16 ... Buffer memory unit, 1
7: information extraction unit, 18: frame synchronization unit, 19: insertion data control unit, 20: line control unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04M 3/08-3/14 H04M 3/22-3/36 H04Q 1/20-1/26

Claims (1)

(57) [Claims] About 1. A downlink Line, a first information extraction portion for extracting a first frame synchronization unit frame synchronization of the subscriber data that is input, the information in the frame of the subscriber data, inserting a first buffer memory part for changing carrying clock of the first frame synchronization portion, a first information insertion unit for inserting the information into the frame of the subscriber data, the frame synchronization pattern of the subscriber data first a frame insertion portion, upstream of the line to be Nitsu
There are a second frame synchronization unit frame synchronization of the input terminal line data, a second information extraction portion for extracting the information in the frame of the terminal line data, a clock of the second frame synchronizer A second buffer memory unit for transferring information, a second information insertion unit for inserting information into a frame of the terminal line data, and a second frame insertion unit for inserting a frame synchronization pattern of the terminal line data. A digital line terminating device comprising: a first line control unit for determining alarm information of the subscriber data and outputting a control signal in a downstream direction of the line;
Extraction of the first information extraction unit by the control signal
Ala extracted alarm information of the subscriber data from the information
And a warning detection unit that emits over arm, the upstream of the line, a second line controller for outputting a control signal to determine the insertion area of the insertion data to the terminal line data, the second line and inserting the data controller for generating an alarm in accordance with the control signal of the control unit, an alarm insert portion that inserts an alarm of the insertion data control unit to the <br/> terminal line data to determine a position of the second line control unit And a digital line termination device.