CN101572567B - Auto switching method based on circuit high resistant monitoring - Google Patents
Auto switching method based on circuit high resistant monitoring Download PDFInfo
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- CN101572567B CN101572567B CN2009100846866A CN200910084686A CN101572567B CN 101572567 B CN101572567 B CN 101572567B CN 2009100846866 A CN2009100846866 A CN 2009100846866A CN 200910084686 A CN200910084686 A CN 200910084686A CN 101572567 B CN101572567 B CN 101572567B
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Abstract
The invention discloses an auto switching method based on circuit high resistant monitoring. A resistance more than normal receiving resistance of circuit (generally more than ten times) is bridge connected the original communication circuit; minimal signal (less than 5%) is split for generating a signal for another transmission circuit. When processing the two received signals, detection is carried out on the two signals by adopting high resistant bridge connection, and a relay is controlled to switch one signal to user equipment according to the detection result. The invention can effectively reduce the influence of the device fault on communication.
Description
Technical field
The present invention relates to communications and monitoring, relate in particular to a kind of automatic switching method based on circuit high resistant monitoring.
Background technology
On many important communication lines, often deal with the cable that possibly occur and dug communication failures such as disconnected, equipment fault, the serious interference of burst through the method that increases a backup transmission line road.Each producer has has also researched and developed relevant automatic switching protection device, the way of generally taking such as Fig. 1 for this reason.After transmitting through switching device shifter, protected signal becomes two paths of signals respectively through two Network Transmission another switching protection to receiving terminal; By the switching device shifter receiving unit two paths of signals of receiving is detected judgement, select one of them fault-free or the relative signal forwarding preferably of quality to give final subscriber equipment through switching.Switching device shifter shown in Figure 1 is concatenated in original circuit.When forward signal; The subscriber equipment signal is after the balanced amplification of the inner process of switching device shifter, timing extraction, the regeneration of sign indicating number type conversion (HDB3 sign indicating number or CMI sign indicating number change into a NRZ sign indicating number) process, and via line coding and drive circuit produce first transmission network and second transmission network that two paths of signals sends respectively.When the two paths of signals that processing receives; It also is the detection of two paths of signals being carried out carrying out after balanced amplification, timing extraction, the sign indicating number type conversion (HDB3 sign indicating number or CMI sign indicating number change into the NRZ sign indicating number) various alarms, error code respectively; Switch in two paths of signals according to testing result again; As utilize the MUX of alternative, the output encoder drive circuit is received in the output of MUX produced and issue subscriber equipment.
The method of this serial connection, when solving the line fault problem, the fault of switching device shifter own also possibly cause communication interruption.Though some device has been considered this problem; On the port of signal in-out apparatus; Added one and let device direct relay (relay is led directly in power down) through device of inhibit signal under power-down state; But this measure can not solve the influence to circuit of device possibly occur except that power down other faults itself fully, such as the aging signal identification error that makes of equalizer amplifier, as the local oscillator inefficacy of Clock Extraction etc.
Summary of the invention
The object of the present invention is to provide a kind of high-ohmic cross-connection technology of utilizing to accomplish the signal automatic switchover, can effectively reduce the automatic switching method of the fault of equipment own the influence of communication.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
Utilize a resistance that normally receives impedance much larger than circuit to jump on original communication line, guaranteeing that diverter pole fraction signal (less than 5%) is used for producing the signal of another transmission line under the normal situation about receiving of transmission equipment.When the two paths of signals that processing receives, take the high-ohmic cross-connection form to detect equally to two paths of signals, and switch wherein one road signal according to the testing result control relay and give subscriber equipment.
A kind of automatic switching method based on circuit high resistant monitoring is characterized in that:
The first step, the user is sent signal is directly linked transmission network 1 in switching device shifter transmitting section inside input port, simultaneously cross-over connection resistance is jumped to the user and send and obtain the subscriber signal shunted on the holding wire at transmitting terminal;
The subscriber signal of second step, shunting is through the amplification of one stage signal amplifier, and through after balanced amplification, timing extraction, the regeneration of sign indicating number type transfer process, via line coding and drive circuit are connected to the input port of transmission network 2 again;
Network 2 signals that network 1 signal that the 3rd step, transmission network 1 send and transmission network 2 send are connected to relay and select in the switching device shifter receiving unit; Selecteed signal is exported to subscriber equipment, and described relay provides matched impedance for non-selected another signal simultaneously;
Network 1 signal that the 4th step, network 1 signal and network 2 signals obtain shunting through the cross-over connection of cross-over connection resistance in switching device shifter receiving unit inside and network 2 signals of shunting; Network 1 signal of shunting and network 2 signals of shunting are through the amplification of one stage signal amplifier; Get into error code, alarm detection and switching controls module through balanced amplification, timing extraction, sign indicating number type conversion back again; Described error code, alarm detection and switching controls module are responsible for the real-time error code that detects generation, alarm, through comparison network 1, network 2 quality of signals, send control signal; The action of control relay is accomplished to switch and is selected.
Described cross-over connection resistance normally receives 10 times of impedance greater than circuit.
Beneficial effect of the present invention:
The present invention utilizes the high-ohmic cross-connection technology, has saved most of signal through switching device shifter regeneration repeating process, and when circuit automatic switching protection function was provided, greatly reducing the fault of device own maybe be to the influence of communication.
Description of drawings
Fig. 1 is the principle schematic of a kind of automatic switching method in the background technology;
Fig. 2 is the principle schematic of a kind of automatic switching method based on circuit high resistant monitoring of the present invention;
Signal connection layout when Fig. 3 switches to network 1 signal for relay;
Signal connection layout when Fig. 4 switches to network 2 signals for relay.
Embodiment
Embodiment of the present invention is following:
Referring to accompanying drawing 2; The signal that subscriber equipment sends is divided into two-way N1 and N2; N1 directly is connected with first transmission network; Through the amplification of one stage signal amplifier, through after balanced amplification, timing extraction, the regeneration of sign indicating number type conversion (HDB3 sign indicating number or CMI sign indicating number change into the NRZ sign indicating number) process, via line coding and drive circuit are connected to second transmission network to N2 again behind cross-over connection resistance.
Signal N1 sends network 1 signal after passing to first transmission network, and network 1 signal is divided into two-way N3 and N4 again, and N3 directly is connected with relay, supplies relay to select, and exports to subscriber equipment.N4 gets into error code, alarm detection and switching controls module through balanced amplification, timing extraction, sign indicating number type conversion (HDB3 sign indicating number or CMI sign indicating number change into the NRZ sign indicating number) back again through the amplification of one stage signal amplifier.
Similarly, signal N2 sends network 1 signal after passing to first transmission network, and network 1 signal is divided into two-way N5 and N6 again, and N5 directly is connected with relay, supplies relay to select, and exports to subscriber equipment.N6 gets into error code, alarm detection and switching controls module through balanced amplification, timing extraction, sign indicating number type conversion (HDB3 sign indicating number or CMI sign indicating number change into the NRZ sign indicating number) back again through the amplification of one stage signal amplifier.
Like Fig. 3, shown in 4, relay also can provide matched impedance for non-selected another signal simultaneously.In Fig. 3, when relay switches network 1 signal to subscriber equipment, for network 2 signals matched impedance is provided simultaneously; In Fig. 4, when relay switches network 2 signals to subscriber equipment, for network 1 signal matched impedance is provided simultaneously.
Error code, alarm detection and switching controls module are responsible for the real-time error code that detects generation, alarm, through comparison network 1, network 2 quality of signals, send control signal, and the action of control relay is accomplished to switch and selected.
Claims (2)
1. automatic switching method based on circuit high resistant monitoring is characterized in that:
The first step, the user is sent signal is directly linked transmission network 1 in switching device shifter transmitting section inside input port, simultaneously cross-over connection resistance is jumped to the user and send and obtain the subscriber signal shunted on the holding wire at transmitting terminal;
The subscriber signal of second step, shunting is through the amplification of one stage signal amplifier, and through after balanced amplification, timing extraction, the regeneration of sign indicating number type transfer process, via line coding and drive circuit are connected to the input port of transmission network 2 again;
Network 2 signals that network 1 signal that the 3rd step, transmission network 1 send and transmission network 2 send are connected to relay and select in the switching device shifter receiving unit; Selecteed signal is exported to subscriber equipment, and described relay provides matched impedance for non-selected another signal simultaneously;
Network 1 signal that the 4th step, network 1 signal and network 2 signals obtain shunting through the cross-over connection of cross-over connection resistance in switching device shifter receiving unit inside and network 2 signals of shunting; Network 1 signal of shunting and network 2 signals of shunting are through the amplification of one stage signal amplifier; Get into error code, alarm detection and switching controls module through balanced amplification, timing extraction, sign indicating number type conversion back again; Described error code, alarm detection and switching controls module are responsible for the real-time error code that detects generation, alarm, through comparison network 1, network 2 quality of signals, send control signal; The action of control relay is accomplished to switch and is selected.
2. a kind of automatic switching method based on circuit high resistant monitoring according to claim 1 is characterized in that: described cross-over connection resistance normally receives 10 times of impedance greater than circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100846866A CN101572567B (en) | 2009-05-22 | 2009-05-22 | Auto switching method based on circuit high resistant monitoring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100846866A CN101572567B (en) | 2009-05-22 | 2009-05-22 | Auto switching method based on circuit high resistant monitoring |
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| Publication Number | Publication Date |
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| CN101572567A CN101572567A (en) | 2009-11-04 |
| CN101572567B true CN101572567B (en) | 2012-08-01 |
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| CN2009100846866A Active CN101572567B (en) | 2009-05-22 | 2009-05-22 | Auto switching method based on circuit high resistant monitoring |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5839093A (en) * | 1996-12-31 | 1998-11-17 | Abb Transmit Oy | System for locating faults and estimating fault resistance in distribution networks with tapped loads |
| CN1753267A (en) * | 2005-09-09 | 2006-03-29 | 长沙理工大学 | Adaptive impedance relay |
| CN101202441A (en) * | 2007-12-14 | 2008-06-18 | 国电南京自动化股份有限公司 | Method for protecting electric impedance element regulation by load self-adapting line |
-
2009
- 2009-05-22 CN CN2009100846866A patent/CN101572567B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5839093A (en) * | 1996-12-31 | 1998-11-17 | Abb Transmit Oy | System for locating faults and estimating fault resistance in distribution networks with tapped loads |
| CN1753267A (en) * | 2005-09-09 | 2006-03-29 | 长沙理工大学 | Adaptive impedance relay |
| CN101202441A (en) * | 2007-12-14 | 2008-06-18 | 国电南京自动化股份有限公司 | Method for protecting electric impedance element regulation by load self-adapting line |
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| CN101572567A (en) | 2009-11-04 |
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