CN102377483A - FPGA (field programmable gate array) detection method for fiber-cut and power-cut alarming of PDH (plesiochronous digital hierarchy) device - Google Patents
FPGA (field programmable gate array) detection method for fiber-cut and power-cut alarming of PDH (plesiochronous digital hierarchy) device Download PDFInfo
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- CN102377483A CN102377483A CN2011102898769A CN201110289876A CN102377483A CN 102377483 A CN102377483 A CN 102377483A CN 2011102898769 A CN2011102898769 A CN 2011102898769A CN 201110289876 A CN201110289876 A CN 201110289876A CN 102377483 A CN102377483 A CN 102377483A
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Abstract
The invention discloses an FPGA (field programmable gate array) detection method for fiber-cut and power-cut alarming of a PDH (plesiochronous digital hierarchy) device, which relates to a PDH system and comprises the following steps: a, an idle channel is appointed between a first device and a second device which are connected through optical fiber and is used as a dedicated channel, and the first device and the second device are both PDH devices; b, the first device can emit a power-cut alarming signal through the dedicated channel when the first device is powered down; c, the second device detects the alarming signal through the FPGA and distinguishes that the first device is fiber-cut or power-cut by combining the no-light alarming information received by an optical module provided by the second device; if the power-cut alarming signal is detected, and then the no-light alarming information is received, and thus the first device can be judged in a power-cut condition; and if only the no-light alarming information is received, but the power-cut alarming signal is not detected, and thus the first device can be judged to be in a fiber-cut condition. According to the method, the influence that the alarming signal is mixed up with messy codes is avoided, the situation that whether the opposite terminal device connected with the optical fiber is in fiber-cut condition or in a power-cut condition can be accurately distinguished, and the failure recovery time can be saved.
Description
Technical field
The present invention relates to PDH (Plesiochronous Digital Hierarchy; Plesiochronous Digital hierarchy) system; Specifically be FPGA (Field-Programmable Gate Array, the field programmable gate array) detection method of the disconnected fine alarm for power-off of a kind of PDH equipment.
Background technology
The PDH transmission network refers to the network of forming based on plesiochronous digital equipment, is mainly used in the edge of transmission network.Generally; Can reserve transfer of data such as management maintenance signal that some transmission channels are used for equipment room, net low-speed data service, network management information in the PDH network; Data in these passages and business datum multiple connection are arrived opposite equip. through Optical Fiber Transmission together.
In the PDH network; When an end equipment (such as client) cuts off the power supply; Service disconnection; Can occur receiving No Light Alarm on the optical link unit in the other end equipment (such as local side) that links to each other with said apparatus optical fiber, also possibly be that the damage of optical link cell failure or optical cable causes owing to receive No Light Alarm, and therefore only relying on and receiving No Light Alarm failure judgement to be disconnected fibre or opposite equip. outage.
Through the idle channel in the PDH network; Special-purpose alarm signal is seen off is a kind of transmission method that generally adopts moment before equipment cuts off the power supply fully; But because this moment, faulty equipment was operated in the critical point of outage; May cause alarm signal accurately not detected, show that mainly the alarm signal that sends out can be mingled with mess code, cause opposite equip. to detect the alarm signal mistake.Therefore being difficult to judge is disconnected fibre or outage, needs find out reason through other approach again, and process is loaded down with trivial details, and the maintenance of inconvenient equipment has increased recovery time of fault greatly.
Summary of the invention
To the defective that exists in the prior art; The object of the present invention is to provide the FPGA detection method of the disconnected fine alarm for power-off of a kind of PDH equipment; Avoid alarm signal to be mingled with the influence of mess code, accurately identification is disconnected fibre or outage through the continuous opposite equip. of optical fiber, saves failure recovery time.
For reaching above purpose; The technical scheme that the present invention takes is: the FPGA detection method of the disconnected fine alarm for power-off of a kind of PDH equipment; Idle channel of agreement is as designated lane between first equipment that links to each other through optical fiber and second equipment to comprise the steps: a., and first equipment and second equipment are PDH equipment; During b. said first device looses power, first equipment sends out an alarm for power-off signal through said designated lane; C. said second equipment detects alarm signal through FPGA, and the fine or outage of No Light Alarm information area disjunction that the optical module that combines again to be provided with receives if detect the alarm for power-off signal and receive No Light Alarm information subsequently, is then judged first device powers down; Receive only No Light Alarm information as if no alarm for power-off signal, judge that then first equipment is disconnected fine.
On the basis of technique scheme, said optical module representes to have light signal to receive with " 1 " sign indicating number type, and " 0 " sign indicating number type is represented No Light Alarm information.
On the basis of technique scheme, the method that adopts supply voltage to detect among the said b detects the first power devices voltage, and when supply power voltage was lower than the critical value of the first equipment operate as normal, first equipment began to insert " 0 " sign indicating number type toward designated lane.
On the basis of technique scheme, said first equipment delays the power down time through the mode that adds the large power supply direct-to-ground capacitance, and through said power supply direct-to-ground capacitance value be provided with control said insertion " 0 " sign indicating number type time span.
On the basis of technique scheme, said second equipment can be received mess code before receiving No Light Alarm information, and the time span of " 0 " sign indicating number type of said insertion is 5 times that second equipment receives the mess code time span.
On the basis of technique scheme, said power supply direct-to-ground capacitance is the electrochemical capacitor of 470uF, and the time span of " 0 " sign indicating number type of insertion is 13ms.
On the basis of technique scheme, said second equipment receives and detects the time span of specific " 0 " sign indicating number type of the wave setting of alarm for power-off signal, and the time span of this specific " 0 " sign indicating number type is 3/4 of the time span of " 0 " sign indicating number type of inserting.
On the basis of technique scheme; The length that the FPGA of said second equipment whenever detects specific " 0 " sign indicating number type just is provided with a flag bit; If detect a flag bit, then do not have the alarm for power-off signal and receive only No Light Alarm information, be judged to be disconnected fine; If detect two flag bits, the alarm for power-off signal is then arranged and receive No Light Alarm information, be judged to be outage.
On the basis of technique scheme, said first equipment is client device, and said second equipment is local side apparatus.
Beneficial effect of the present invention is: linking to each other through optical fiber is provided with designated lane between the terminal device, and an end equipment sends alarm signal, the alarm signal that other end Equipment Inspection is received through designated lane; And through the mode of flag bit is set; Judge disconnected fine still outage in conjunction with receiving No Light Alarm information, avoided in the signal mess code effectively, alarm signal that can the accurate recognition opposite equip. the interference of judgement; Judge disconnected fine still outage; Process is simple, makes things convenient for plant maintenance, has significantly reduced the recovery time of fault.
Description of drawings
Fig. 1 is the butt joint sketch map of first equipment and second equipment in the embodiment of the invention;
Signal timing diagram when Fig. 2 breaks fibre for the embodiment of the invention in the designated lane;
Signal timing diagram when Fig. 3 cuts off the power supply for the embodiment of the invention in the designated lane.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
As shown in Figure 1, in the PDH network, through two PDH equipment that optical fiber links to each other, wherein first equipment is client device, and second equipment is local side apparatus, is provided with FPGA in second equipment.
The FPGA detection method of the disconnected fine alarm for power-off of PDH equipment of the present invention comprises the steps:
A. idle channel of agreement is as designated lane between first equipment that links to each other through optical fiber and second equipment, and first equipment and second equipment are PDH equipment.
During b. said first device looses power, first equipment sends out an alarm for power-off signal through said designated lane.
Before the power down, the method that first equipment adopts supply voltage to detect detects supply power voltage, and when supply power voltage was lower than the critical value of the first equipment operate as normal, first equipment began to insert " 0 " sign indicating number type toward designated lane.Because the process of power down maybe be very fast; For there being time enough before equipment quits work, warning information to be sent; First equipment delays the power down time through the mode that adds the large power supply direct-to-ground capacitance; And the time span that " 0 " sign indicating number type that control inserts is set through power supply direct-to-ground capacitance value, the time span of " 0 " sign indicating number type of confirming to insert can make things convenient for the trace routine of FPGA in second equipment that detected parameters is set.In the present embodiment, the power supply direct-to-ground capacitance is selected the electrochemical capacitor of 470uF for use, and the time span of " 0 " sign indicating number type that can guarantee to insert is 13ms, and promptly " 0 " of alarm for power-off signal sign indicating number type time span is 13ms.
C. said second equipment detects alarm signal through FPGA, the fine or outage of No Light Alarm information area disjunction that the optical module that combines again to be provided with receives.Said second equipment can be received mess code before receiving No Light Alarm information; When considering first equipment power dissipation; Adjust the size of power supply direct-to-ground capacitance value in first equipment; With the time span of " 0 " sign indicating number type of guarantee inserting is that second equipment receives 5 times of mess code time span and is as the criterion, and power supply direct-to-ground capacitance value is unsuitable excessive, crosses conference and causes first device power supply (DPS) unstable.First equipment and second equipment all use RTXM153TL-JFC model optical module in the present embodiment; This optical module sensitivity is-38dBm; Promptly when received optical power during less than-38dBm, said optical module sends No Light Alarm information and gives second equipment, is generally level "0".Said second equipment receives and detects specific " 0 " code length of wave setting of alarm for power-off signal, and this specific " 0 " code length is 3/4 of the time span of " 0 " sign indicating number type of inserting, in the present embodiment, as long as the length of " 0 " sign indicating number is greater than 9ms.The FPGA of second equipment whenever detects specific " a 0 " code length flag bit just is set, and is as shown in Figure 2, if detect a flag bit, then do not have the alarm for power-off signal and receives only No Light Alarm information, is judged to be disconnected fine; As shown in Figure 3, if detect two flag bits, the alarm for power-off signal is then arranged and receive No Light Alarm information, be judged to be outage.
As shown in Figure 2, SD is the No Light Alarm information that optical module receives, and RDATA representes the alarm for power-off signal that first equipment transmits through designated lane.When present embodiment interrupts fine the generation; Because disconnected fine process is a process that luminous power fails gradually; Received optical power at the second equipment optical module is approaching-and can't operate as normal before the 38dBm; Being embodied in has one section mess code earlier because optical module self receiving device export " 0 " sign indicating number type after luminous power is lower than thresholding, so behind the mess code for some time length be " 0 " yard type about 15ms.Because it is 9ms that the FPGA of second equipment detects the time span of specific " 0 " yard type, can be that 15ms " 0 " sign indicating number type is once put flag bit only therefore to time span, can be judged to be the disconnected fibre of first equipment through a flag bit.
As shown in Figure 3, SD is the No Light Alarm information that optical module receives, and RDATA representes the alarm for power-off signal that first equipment transmits through designated lane.When cutting off the power supply in the present embodiment; It is that " 0 " sign indicating number type of 13ms is seen off that a time span was arranged before the not enough mess code of luminous power appears in optical module; The i.e. alarm for power-off signal seen off before the power interruptions of first equipment, be right after thereafter the mess code section with again after time span be that 15ms " 0 " sign indicating number type is identical when interrupting fibre with Fig. 2, free length is " 0 " yard type about 13ms when promptly cutting off the power supply; There is one section mess code the centre, and following free length again is " 0 " sign indicating number type about 15ms.For avoiding the interference of mess code to alarm signal; The FPGA of second equipment at first detection time length 9ms continuous " 0 " sign indicating number type; To time span be 13ms " 0 " sign indicating number type put a flag bit; Because the centre has one section mess code, be that " 0 " sign indicating number type of 15ms is put a flag bit to time span again, can be judged to be first device powers down through two flag bits.
In addition; If adopt other capacitances or other optical module models; Just need confirm specific " 0 " sign indicating number type length, consider under the redundancy situation that " 0 " code length is selected about 3/4 the getting final product of time span of " 0 " sign indicating number type of insertion for use through measuring the second equipment receiving alarm information waveform.
The present invention is not limited to above-mentioned execution mode, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, and these improvement and retouching also are regarded as within protection scope of the present invention.The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (9)
1. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment is characterized in that, comprises the steps:
A. idle channel of agreement is as designated lane between first equipment that links to each other through optical fiber and second equipment, and first equipment and second equipment are PDH equipment;
During b. said first device looses power, first equipment sends out an alarm for power-off signal through said designated lane;
C. said second equipment detects alarm signal through FPGA, and the fine or outage of No Light Alarm information area disjunction that the optical module that combines again to be provided with receives if detect the alarm for power-off signal and receive No Light Alarm information subsequently, is then judged first device powers down; Receive only No Light Alarm information as if no alarm for power-off signal, judge that then first equipment is disconnected fine.
2. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 1 is characterized in that: said optical module representes to have light signal to receive with " 1 " sign indicating number type, and " 0 " sign indicating number type is represented No Light Alarm information.
3. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 2; It is characterized in that: the method that adopts supply voltage to detect among the said b detects the first power devices voltage; When supply power voltage was lower than the critical value of the first equipment operate as normal, first equipment began to insert " 0 " sign indicating number type toward designated lane.
4. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 3; It is characterized in that: said first equipment delays the power down time through the mode that adds the large power supply direct-to-ground capacitance, and through said power supply direct-to-ground capacitance value be provided with control said insertion " 0 " sign indicating number type time span.
5. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 4; It is characterized in that: said second equipment can be received mess code before receiving No Light Alarm information, and the time span of " 0 " sign indicating number type of said insertion is 5 times that second equipment receives the mess code time span.
6. like the FPGA detection method of claim 4 or the disconnected fine alarm for power-off of 5 described PDH equipment, it is characterized in that: said power supply direct-to-ground capacitance is the electrochemical capacitor of 470uF, and the time span of " 0 " sign indicating number type of insertion is 13ms.
7. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 3; It is characterized in that: said second equipment receives and detects the time span of specific " 0 " sign indicating number type of the wave setting of alarm for power-off signal, and the time span of this specific " 0 " sign indicating number type is 3/4 of the time span of " 0 " sign indicating number type of inserting.
8. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 7; It is characterized in that: on the basis of technique scheme; The length that the FPGA of said second equipment whenever detects specific " 0 " sign indicating number type just is provided with a flag bit; If detect a flag bit, then do not have the alarm for power-off signal and receive only No Light Alarm information, be judged to be disconnected fine; If detect two flag bits, the alarm for power-off signal is then arranged and receive No Light Alarm information, be judged to be outage.
9. the FPGA detection method of the disconnected fine alarm for power-off of PDH equipment as claimed in claim 1, it is characterized in that: said first equipment is client device, said second equipment is local side apparatus.
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| CN2011102898769A CN102377483A (en) | 2011-09-28 | 2011-09-28 | FPGA (field programmable gate array) detection method for fiber-cut and power-cut alarming of PDH (plesiochronous digital hierarchy) device |
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| CN2011102898769A CN102377483A (en) | 2011-09-28 | 2011-09-28 | FPGA (field programmable gate array) detection method for fiber-cut and power-cut alarming of PDH (plesiochronous digital hierarchy) device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033997A (en) * | 2015-03-20 | 2016-10-19 | 中兴通讯股份有限公司 | Processing method and device for power-off alarms and terminal |
| CN106033995A (en) * | 2015-03-18 | 2016-10-19 | 苏州超锐微电子有限公司 | Optical fiber system power down detection notification method |
| CN108599837A (en) * | 2018-03-22 | 2018-09-28 | 烽火通信科技股份有限公司 | A kind of restoration methods and system of optical module signal interruption |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335658A (en) * | 2008-08-05 | 2008-12-31 | 中兴通讯股份有限公司 | Remote real-time monitoring method implementing communication appliance power down warning |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335658A (en) * | 2008-08-05 | 2008-12-31 | 中兴通讯股份有限公司 | Remote real-time monitoring method implementing communication appliance power down warning |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033995A (en) * | 2015-03-18 | 2016-10-19 | 苏州超锐微电子有限公司 | Optical fiber system power down detection notification method |
| CN106033997A (en) * | 2015-03-20 | 2016-10-19 | 中兴通讯股份有限公司 | Processing method and device for power-off alarms and terminal |
| CN108599837A (en) * | 2018-03-22 | 2018-09-28 | 烽火通信科技股份有限公司 | A kind of restoration methods and system of optical module signal interruption |
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Application publication date: 20120314 |