CN2676517Y - Subscriber end switching device for DSL main and backup line - Google Patents

Abstract

The utility model relates to a switching device of the main and backup subscriber lines in a subscriber terminal position. The cable copper wires accessed main and backup subscriber lines are directed by DDN, PSPDN, etc, in the telecommunication system. The utility model comprises a double acoustic frequency decoding circuit used for receiving the double acoustic frequency switching signals of the local side, a CPU used for receiving the decoded signals and dispatching the switching control signals of the main and backup lines, a drive circuit which responds to the switching control signals dispatched by the CPU and generates corresponding driving signals, and a switching circuit composed of two electric relays provided with double pole double throw switching switches. The first electric relay is used for the switching between the main and backup lines and a subscriber Modem, and the second electric relay is used for the switching between the main and backup lines and the double acoustic frequency decoding circuit. After the utility model is matched for using with the switching device for the main and backup lines of the local side, when the main line is broken, choosing the users on the computer of the test center and then clicking 'choosing to use the backup line' of the menu are only required. The system automatically completes the operating of switching from the main line to the backup line, so as to make the subscriber lines recover to a normal operation with the fastest speed.

Description

The active and standby line user end switching device shifter of digital subscriber line

Technical field

The utility model belongs in the telecommunication system, the public data communication net detects and service equipment subscriber's line, relate to DDN, PSPDN etc. and utilize the subscriber's line of cable copper wire access to carry out the device that active and standby line automaticallyes switch, be specifically related to the switching device shifter of active and standby line in the user side position at it.

Background technology

Current data communication has been one of indispensable main communication mode of information-intensive society.Along with the continuous growth of data communication service, the professional private networks of various public data communications (PSPDN, DDN, DCN etc.) constantly enlarge, and communication capacity, transmission rate improve constantly.At present, insert under the condition that adopts the cable copper cash the user, the data communication rates that subscribers feeder (cable copper twisted pairs) can transmit Baseband Modem has reached 64Kb/s, even it is higher, newly emerge in large numbers data communication service existing N-ISDN, HDSL, ADSL, reach XDSL etc., the DATA and the AV business of 2048Kb/s speed is provided.Therefore, how to utilize the existing existing huge resource of copper cable Access Network to expand transmission broadband new business, nature just becomes the problem that telecommunications operator and telecommunication technology research department are paid close attention to.

Being based upon N-ISDN, DDN on the service cable copper wire access basis, ADSL etc. in recent years receives praises from customers, be used widely in all departments such as finance, education, scientific research, enterprise, security, develop very fast (for example the present Jiangsu of DDN user reaches more than 60,000), growth trend is good., seeming incompatible at present is the digital subscriber line failure rate height that adopts cable copper cash mode, and its reason mainly is to lack corresponding maintenance test means and supporting maintenance test equipment, can not pinpoint the problems immediately, fixes a breakdown rapidly.Such as, subscriber's line picks out from the MDF (main frame) of local side in the DDN system, is connected to user Modem by a pair of cable copper cash, sees shown in Figure 1.In case after disconnection fault appearred in subscribers feeder, telecommunication department need singly be rushed to repair according to the newspaper barrier.Because need local side and user side to cooperate during maintenance, the repairing time is dozens of minutes at least, several days at most, in addition longer, have a strong impact on telex network.In order to address this problem, some local telecommunication department is taked to draw two pairs of subscribers feeders to user side at local side MDF at present, and these two pairs of circuits are called main line and are equipped with line, see shown in Figure 2.At ordinary times, use main line to communicate between local side and the user usually, be equipped with line in case standby.When disconnection fault appears in main line in using, enable promptly fully that line communicates,, improve service quality to reduce user's fault time.Specific operation process is as follows:

1, at user side main line is pulled up from Modem, will be equipped with line and connect.

2, at local side according to subscriber data, on MDF, find out this user's the line that is equipped with, by wire jumper main line is removed, be equipped with line and connect, recover telex network as early as possible.

3, main line is carried out repair and maintenance.

Above processing mode shortcoming is:

1, can't predict fault in advance, just can keep in repair after the need user reports barrier, repairing time while is long, influences user job, causes customer complaint easily.

2, complex operation need access this subscriber data earlier during processing, from the thousands of of distributing frame a pair of line of finding out this user the distribution is handled then.

3, need each department's co-operation, will obtain user's compounding practice especially, can cause that the user dislikes.

More than as seen, although this way has very much progress than in the past, still have certain distance, so line service is difficult to break away from passive situation with user's real requirement, it is quite outstanding that problem has seemed.

At above problem, the utility model provides the active and standby line in a kind of digital subscriber line broken string back to be positioned at the switching device shifter of user side.This device is accepted control centre instruction and is finished task switching between the active and standby line of user side position, returns to normal operating conditions as early as possible to cooperate subscriber's line.

Summary of the invention

For achieving the above object, the technical solution adopted in the utility model is: the active and standby line user end switching device shifter of a kind of digital subscriber line comprises:

Double-tone is decoding circuit frequently, and input receives the double-tone frequency switching signal of local side, and output produces corresponding decoded signal;

The CPU processor receives the decoded signal that double-tone frequency decoding circuit is exported, and sends the active and standby line switch-over control signal of user side;

Drive circuit, the switch-over control signal that input response CPU processor sends, output produces respective drive signal;

Commutation circuit, relay by two band dpdt double-pole double-throw (DPDT) diverter switches constitutes, first relay is located in active and standby line and the circuit that user Modem is connected, wherein, the corresponding main line IN1A of the terminal of a single-pole double throw diverter switch, be equipped with line IN2A and be connected with subscribers feeder OUTA, the corresponding main line IN1B of the terminal of another single-pole double throw diverter switch, line IN2B is connected with subscribers feeder OUTB fully; Second relay is located in active and standby line and the double-tone circuit that decoding circuit is connected frequently, wherein, the corresponding main line IN1A of the terminal of a single-pole double throw diverter switch, be equipped with line IN2A and double-tone frequently an input of decoding circuit is connected, the corresponding main line IN1B of the terminal of another single-pole double throw diverter switch, another input that is equipped with line IN2B and double-tone frequency decoding circuit are connected; The control end of two relays links to each other with the respective drive signal of drive circuit output.

The related content of technique scheme is explained as follows:

1, in the such scheme, described double-tone decoding circuit frequently can adopt 8870 double-tones decoding chip frequently, also can adopt 9370 double-tones decoding chip or other double-tone frequency decoding chip frequently.

The utility model operation principle:

One, subscribers feeder adopts the DDN data communication system of active and standby ray mode

Shown in accompanying drawing 2, local side is made up of node machine (communication apparatus), Modem and MDF (main frame).User side is made up of Modem and data equipment.Each user is connected by two pairs of subscribers feeders, i.e. main line and line fully, every pair of subscribers feeder are by two copper cash, and promptly A line and B line are formed.

Two, cooperate the system that realizes automatic switchover

In order to make the utility model realize active and standby line task switching, need following test macro and cooperate at user side:

Test macro comprises: test center, testing equipment, wherein:

Test center is a software section, and being installed in the computer of data center of telecom operators becomes a control centre;

Testing equipment comprises measuring head, grabs line equipment, the active and standby line switching device shifter of local side, is installed in the machine room of end office (EO), is serially connected on the MDF.

Three, MDF (main frame) mode of connection in the former DDN system

Shown in accompanying drawing 3, line 1 leads to the Modem of local side, and line 2 leads to subscribers feeder.Be connected by MDF at DDN system center line 1 and line 2.

Four, test macro access way

Shown in accompanying drawing 4, testing equipment is connected in series into and among the MDF is: line 1 and line 2 are disconnected, and line 1 connects the inlet wire of testing equipment, and line 2 connects the outlet of testing equipment.

Five, testing equipment is formed and annexation

Shown in accompanying drawing 5, comprise measuring head, grab line equipment, the active and standby line switching device shifter of local side that wherein, inlet wire is a pair of, outlet is served as theme and is equipped with two pairs on line, and every pair is made of two cable copper cash.

Six, active and standby line switching flow following (suppose that the user is using main line, it be switched to fully on the line):

1, control centre sends a command to measuring head, and measuring head is grabbed line equipment extracting user according to order control and is equipped with line;

2, measuring head sends the DTMF instruction from being equipped with on the line to the user side switching device shifter, this instruction is sent into the CPU processor after decoding by double-tone frequency decoding circuit, after the CPU processor carries out verification to order, enter " being equipped with the lineman does " state, and send control signal, make on the one hand first relay throw off being connected of main line and user Modem, connect simultaneously and be equipped with being connected of line and user Modem; Make second relay throw off be equipped with line and double-tone being connected of decoding circuit frequently on the other hand, connect being connected of main line and double-tone frequency decoding circuit simultaneously.

3, control centre sends and recovers order to measuring head, and the measuring head operation is grabbed line equipment and restored to the original state.

4, control centre sends order to the active and standby line switching device shifter of local side, the active and standby line switch of local side is thrown off the main line of local side from system, being equipped with line taps into system (this belongs to the task of the active and standby line switching device shifter of local side, not belonging to the active and standby line task switching of the utility model user side, is in order to embody the integrality of the active and standby line switching principle of whole user in this statement).

After being used, active and standby line switching device shifter of the utility model and local side and test center have following advantage:

1, simple to operate, so long as insert the subscribers feeder of test macro, carry out active and standby line and switch the name that only need choose this user on the computer of test center, the menu of clicking " selecting line (or selecting main line for use) fully for use " then gets final product, and system can finish the operation that active and standby line switches automatically then.

2, complete operation is quick, can recover communication soon, improves the service level of telecom operators.

Description of drawings

Accompanying drawing 1 is the common DDN block diagram of system.

Accompanying drawing 2 adopts the DDN block diagram of system of active and standby ray mode for subscribers feeder.

Accompanying drawing 3 is MDF in the DDN system (main frame) wiring schematic diagram.

Accompanying drawing 4 inserts schematic diagram for testing equipment.

Accompanying drawing 5 is partly formed and the annexation block diagram for testing equipment.

Accompanying drawing 6 is active and standby line of user side and switching device shifter schematic diagram.

Accompanying drawing 7 is the utility model structured flowchart.

Accompanying drawing 8 is the utility model partial circuit figure.

Embodiment

Below in conjunction with drawings and Examples description is done into～gone on foot to the utility model:

Embodiment: shown in accompanying drawing 6～7, the active and standby line user end switching device shifter of a kind of digital subscriber line, decoding circuit, CPU processor, drive circuit and commutation circuit are formed frequently by double-tone.This device is installed in user side.

Commutation circuit is made of relay K 6, the K7 of two band dpdt double-pole double-throw (DPDT) diverter switches, see Fig. 8, first relay K 6 is located in active and standby line and the circuit that user Modem is connected, wherein, the corresponding main line IN1A of the terminal of a single-pole double throw diverter switch, be equipped with line IN2A and be connected with subscribers feeder OUTA, the corresponding main line IN1B of the terminal of another single-pole double throw diverter switch, line IN2B is connected with subscribers feeder OUTB fully.Second relay K 7 is located in active and standby line and the double-tone circuit that decoding circuit is connected frequently, wherein, the corresponding main line IN1A of the terminal of a single-pole double throw diverter switch, be equipped with line IN2A and double-tone frequently an input BXSIGN of decoding circuit is connected, the corresponding main line IN1B of the terminal of another single-pole double throw diverter switch, be equipped with line IN2B and double-tone frequency decoding circuit another be connected by C112 ground connection input.The control end of first relay K 6 is RL16, and the control end of second relay K 7 is RL17, and two control end RL16, RL17 link to each other with the respective drive signal of drive circuit output respectively.

Double-tone frequently decoding circuit U51 adopts 8870 double-tones decoding chip frequently, sees shown in Figure 8ly, and input is by the double-tone that is equipped with line and receives local side switching signal frequently, and output DTMF11～DTMF14 produces corresponding decoded signal.

The CPU processor is seen shown in Figure 7ly, receives the decoded signal of double-tone decoding circuit output frequently, sends the active and standby line switch-over control signal of user side.

Drive circuit, see shown in Figure 7, the switch-over control signal that input response CPU processor sends, output produces respective drive signal.

See shown in Figure 8, IN1A, the IN1B inlet of serving as theme, IN2A, IN2B is for being equipped with the line inlet, suppose IN1A, IN1B is the main line in usefulness, and IN2A, IN2B are in use extension wire not, then this moment, RL16 was a high level, and first relay K 6 makes OUTA, and OUTB meets IN1A, IN1B; RL17 is a low level, and second relay K 7 makes C111, and C112 meets IN2A, IN2B.

Carry out active and standby line when switching, the switching command (double-audio signal) that sends from local side is from IN2A, and IN2B is equipped with line and enters, after double-tone decoding chip U51 decoding frequently, send into CPU, after CPU carries out verification correctly to order, enter " being equipped with the lineman does " state, transmitting control commands is given RL16, RL17 through drive circuit, making RL16 is low level, RL17 is a low level, and this moment, relay K 6 and K7 action made OUTA, OUTB meets IN2A, IN2B; C111, C112 meets IN1A, IN1B, the active and standby line of user side is finished switching.

Claims (3)

1, the active and standby line user end switching device shifter of a kind of digital subscriber line is characterized in that comprising:

Double-tone is decoding circuit frequently, and input receives the double-tone frequency switching signal of local side, and output produces corresponding decoded signal;

The CPU processor receives the decoded signal that double-tone frequency decoding circuit is exported, and sends the active and standby line switch-over control signal of user side;

Drive circuit, the switch-over control signal that input response CPU processor sends, output produces respective drive signal;

Commutation circuit, relay by two band dpdt double-pole double-throw (DPDT) diverter switches constitutes, first relay is located in active and standby line and the circuit that user Modem is connected, wherein, the corresponding main line [IN1A] of the terminal of a single-pole double throw diverter switch, be equipped with line [IN2A] and be connected with subscribers feeder [OUTA], the terminal correspondence main line [IN1B] of another single-pole double throw diverter switch, line [IN2B] is connected with subscribers feeder [OUTB] fully; Second relay is located in active and standby line and the double-tone circuit that decoding circuit is connected frequently, wherein, the corresponding main line [IN1A] of the terminal of a single-pole double throw diverter switch, be equipped with line [IN2A] and double-tone frequently an input of decoding circuit is connected, the corresponding main line [IN1B] of the terminal of another single-pole double throw diverter switch, another input of line [IN2B] and double-tone frequency decoding circuit is connected fully; The control end of two relays links to each other with the respective drive signal of drive circuit output.

2, user side switching device shifter according to claim 1 is characterized in that: above-mentioned double-tone decoding circuit frequently adopts 8870 double-tones decoding chip frequently.

3, user side switching device shifter according to claim 1 is characterized in that: above-mentioned double-tone decoding circuit frequently adopts 9370 double-tones decoding chip frequently.

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