CN101820558B - Method for detecting long luminance ONU in passive optical network - Google Patents
Method for detecting long luminance ONU in passive optical network Download PDFInfo
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Abstract
The invention discloses a method for detecting long luminance ONU in a passive optical network, which comprises that: a signal TX_RSSI transmitted by an optical module is detected after an ONU is normally powered up, and the signal TX_RSSI indicates that whether an optical signal is transmitted in the optical module; when the signal TX_RSSI indicates that the optical signal is output, the ONU judges whether high-level retention time of the signal TX_RSSI exceeds the minimum polling cycle of the passive optical network; and if the high-level retention time of the signal TX_RSSI exceeds the minimum polling cycle of the passive optical network, a GPON media access controller of the ONU transmits an ID number and a long luminance alarm to an OLT through an OMCI channel, and the ONU cuts off the transmission of the optical module by cutting off a transmitting power supply VCC_Tx of the optical module. The method for detecting the long luminance ONU in the passive optical network directly monitors light path signals, eliminates long luminance faults to the full extent, and can cut off the long luminance ONU and accurately report the alarm information, and improves the reliability of the device.
Description
Technical field
The present invention relates to communication technical field, is the method that a kind of EPON (PassiveOptical Networks, PON) detects long luminance ONU (Optical Networks Unit) specifically.
Background technology
In GPON (Gigabit Passive Optical Networks) system, be to connect a plurality of optical network unit ONU (Optical NetworksUnit) by optical line terminal OLT (Optical Line Terminal) by optical distribution network ODN (OpticalDistribution Network).Up employing TDMA mode from ONU to OLT, all transmitting uplink data are controlled by OLT.OLT only allows an ONU to send upstream data at synchronization, for fear of the conflict between the ONU, OLT distributes different time slots for each ONU according to the bandwidth demand of ONU, ONU can only send upstream data in the time slot of oneself, as shown in Figure 1, ONU1, ONU2, ONU3 ... the time slot of ONUn is respectively TS1, TS2, TS3 ... TSn.If but there is an ONU to be in abnormality and luminous for a long time, thus cause the light signal of a plurality of ONU to be superimposed, and the data of the reception ONU that OLT can not be correct cause the paralysis of whole GPON system.As shown in Figure 2, wherein ONU1 is in abnormality and is luminous for a long time.And in the communication equipment of Modern Telecommunication level, often require equipment to have very high reliability and very strong managerial ability.This just requires our equipment to have can detect the function that long luminance ONU also can automatically shut down long luminance ONU automatically.And the ONT management control interface (OMCI), OMCI protocol-independent MIB, the ONT that have G.984.4 stipulated gigabit passive optical network (GPON) system in the standards system of GPON manage control channel (OMCC) and agreement, and the OMCI message set, OLT by OMCI can run ONU, maintenance and management.
" a kind of method and apparatus that improves passive optical network reliability " (application number 200710073093.0) of ZTE Co., Ltd's application proposed a kind of implementation method that detects long luminance ONU.Its operation principle is: the unlatching that the effective status time of detecting the optical module enable signal of the state of clock lock signal of serializing device/unserializing device (SerDes) and medium access controller (MAC) is controlled optical module among the ONU whether.There is following problem in this scheme:
First: in order to detect the clock lock signal serializing device/unserializing device (SerDes) and medium access controller (MAC) are separated in this scheme, increased so greatly the cost of equipment, and there is no need.
Second: another weak point of this scheme is that it can not overcome the problem of the long hair light that causes owing to optical module itself, and it can only solve the problem of optical module being opened for a long time because PON MAC (medium access controller) circuit breaks down.
The the 3rd: if there is long luminance ONU to occur, do not have the alarm indication in the OLT side, can not accomplish fault location.
Summary of the invention
For the defective that exists in the prior art, the object of the present invention is to provide a kind of method of detecting long luminance ONU in passive optical network, directly monitor optical path signal, stop long hair light fault in the maximum magnitude, strengthened the operation of equipment, the ability of maintenance and management.Can not only turn-off long luminance ONU, avoid the undesired of an ONU and cause the problem of the ONU cisco unity malfunction under the whole PON, and can accurately report and alarm information, allow the attendant can locate rapidly the fault point, improve the reliability of equipment, improved telecom operators and user's satisfaction.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of method of detecting long luminance ONU in passive optical network is characterized in that:
Step 1: the ONU long hair light fault flag in the rear detection flash chip that powers on if long hair light fault flag be " 1 ", represents that ONU is in the long hair light fault, lights the stand by lamp D1 on the ONU panel, indicates this ONU to need repairing; If long hair light fault flag is " 0 ", ONU begins to detect the signal TX_RSSI that optical module sends, and signal TX_RSSI pilot light module has or not light signal to send;
Step 2: when the TX_RSSI indication had light signal output, ONU judged whether the high-level retention time of signal TX_RSSI has surpassed the minimum taking turn cycle of EPON;
Step 3: if the high-level retention time of signal TX_RSSI has surpassed the minimum taking turn cycle of EPON, the GPON medium access controller of ONU sends ID number and the alarm of long hair light of this ONU to OLT by the OMCI passage,
Step 4: the GPON medium access controller by the OMCI agreement with long hair light alarm report OLT after, again with the long hair light fault flag set in the flash chip, the transmission that ONU turn-offs optical module by the transmission power supply VCC_Tx that turn-offs optical module,
Step 5: if the determination result is NO in the step 2, the reset of long hair light fault flag is returned step 1 and is continued to detect the signal TX_RSSI that optical module sends.
On the basis of technique scheme, the measurement in the minimum taking turn cycle of EPON realizes in the steps below: the maximum upstream bandwidth that this ONU is distributed the PON system, then the high-level retention time of measuring-signal TX_RSSI, the high-level retention time of the signal TX_RSSI that records is the minimum taking turn cycle of EPON.
On the basis of technique scheme, described ONU comprises optical module TRX1, GPON medium access controller IC1, flash chip IC 2, described GPON medium access controller IC1 is built-in CPU,
The reception power supply VCC_Rx of optical module TRX1 and transmission power supply VCC_Tx separate, and receive power supply VCC_Rx and connect the 3.3v power supply,
Optical module TRX1 will be used to refer to optical module and have or not the signal TX_RSSI of light signal transmission to send into GPON medium access controller IC1,
The transmission power supply VCC_Tx of optical module is opened or turn-offed to CPU control PMOS transistor T 1,
Resistance R 1 one end ground connection, the other end are connected to and send power supply VCC_Tx, and resistance R 2 one ends link to each other with power supply 3.3V, and the other end links to each other with GPON medium access controller IC1,
The light-emitting diode D1 that is used for long hair light alarm indication links to each other with GPON medium access controller IC1,
The GPON medium access controller provides to optical module TRX1 and sends enable signal TX_EN,
GPON medium access controller IC1 reads and writes flash chip IC 2 by local bus (local data's bus).
On the basis of technique scheme, the model of described optical module TRX1 is RTXM169-504, and the model of described GPON medium access controller is BL2340R, and the model of described flash chip is S29GL128P11TF1V1,
The 1st pin of PMOS transistor T 1 is grid G, and it links to each other with the pin GPIO1 of GPON medium access controller IC1; The 2nd pin is source class S, directly links to each other with power supply 3.3V; The 3rd pin is drain D, links to each other with the transmission power supply VCC_Tx of optical module.
On the basis of technique scheme, signal TX_RSSI sends into the pin GPIO2 of GPON medium access controller IC1 from the pin two 0 of optical module TRX1.
On the basis of technique scheme, resistance R 2 one ends link to each other with power supply 3.3V, and the other end links to each other with the pin GPIO1 of GPON medium access controller IC1.
On the basis of technique scheme, the positive pole of light-emitting diode D1 directly links to each other with power supply 3.3V, and negative pole meets the pin GPIO3 of GPON medium access controller IC1.
On the basis of technique scheme, GPON medium access controller IC1 will send the 13rd pin that enable signal TX_EN sends to optical module TRX1 by pin K1.
On the basis of technique scheme, the firm powered on moment of ONU, the pin GPIO1 of GPON medium access controller IC1 is high-impedance state, it is high level that pull-up resistor R2 makes the 1st pin grid of T1, transistor T 1 not conducting, pull down resistor R1 will send power supply VCC_Tx and be set to low level, and optical module TRX1 is not luminous without sending power supply.
On the basis of technique scheme,
Step 1: after ONU normally powers on, pin GPIO1=1 is set, transistor T 1 not conducting, it is closed condition that optical module sends power supply VCC_Tx,
The built-in CPU of GPON medium access controller links to each other with the flash chip by local bus bus, detects the long hair light fault flag in the flash chip,
If long hair light fault flag is " 1 ", expression ONU is in the long hair light fault, lights the stand by lamp D1 on the ONU panel: the GPON medium access controller arranged pin GPIO3 and was " 0 " this moment, light light-emitting diode D1, expression ONU is in the long hair light fault, and this ONU needs repairing
If long hair light fault flag is " 0 ", expression ONU is not in the long hair light fault, and arrange GPIO1=0 this moment, and the transmission power supply VCC_Tx of optical module is opened in transistor T 1 conducting, and signal TX_RSSI produces thereupon,
Step 2: by the GPIO2 pin of GPON medium access controller, the high-level retention time of TX_RSSI signal when whether the high-level retention time of detection signal TX_RSSI surpasses this ONU distribution maximum bandwidth,
Step 3: if do not surpass, the reset of long hair light fault flag is got back to step 2 and is continued to detect the TX_RSSI signal; If surpass, represent that then long hair light fault occurs this ONU, the GPON medium access controller by the OMCI agreement with this alarm report OLT, when the ONU judgement self is in the long hair light state, at first send a warning message and Port-ID number of ONU to OLT by the OMCI agreement, OLT finds this ONU ID according to Port-ID number, and correspondence finds the sequence number of this ONU again, and then finds corresponding ONU user's relevant information at the customer management information platform of local side webmaster; The message of OMCI agreement comprises the OMCI tail field of type of message, 1 byte device identifier, 4 byte message identifiers, 32 byte message contents and 8 bytes of things relevant identifier TCI, 1 byte of GEM header, 2 bytes of 5 bytes,
The Port-ID that comprises the ONU that is addressed in the GEM heading,
Device identifier is fixed as 0X0A for GPON equipment,
Message content the 14th byte to the 41 bytes are the alarm mask, and the alarm coding is the alarm of long hair light No. 223, it is 0X10 that the type of message byte value is set when the alarm of long hair light is arranged, the alarm mask of message content the 41st byte the 1st bit is set to 1 in the message format again, the value of message content the 45th byte is made as 223, the GPON medium access controller is exactly that OMCI agreement by above definition is with long hair light alarm report OLT
Step 4: the GPON medium access controller by the OMCI agreement with long hair light alarm report OLT after, again with the long hair light fault flag set in the flash chip, the long hair light Reflector that is stored in the flash chip is used for indicating this ONU whether to be in long hair light when ONU pass electricity is restarted again, so that safeguard, long hair light fault flag does not send to OLT by the OMCI agreement
Close the transmission power supply of optical module: pin GPIO1=1 is set, transistor T 1 not conducting, it is closed condition that optical module sends power supply VCC_Tx,
Step 5: if the determination result is NO in the step 2, the reset of long hair light fault flag is returned step 1 and is continued to detect the signal TX_RSSI that optical module sends.
The method of detecting long luminance ONU in passive optical network of the present invention is directly monitored optical path signal, stops long hair light fault in the maximum magnitude, has strengthened the operation of equipment, the ability of maintenance and management.Can not only turn-off long luminance ONU, avoid the undesired of an ONU and cause the problem of the ONU cisco unity malfunction under the whole PON, and can accurately report and alarm information, allow the attendant can locate rapidly the fault point, improve the reliability of equipment, improved telecom operators and user's satisfaction.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1 PON system uplink direction normal mode of operation schematic diagram,
Fig. 2 PON system uplink direction long luminance ONU mode of operation schematic diagram,
The checkout gear schematic diagram of Fig. 3 long luminance ONU,
The overhaul flow chart of Fig. 4 long luminance ONU,
The message format (GEM pattern) of Fig. 5 ONU management control protocol,
Fig. 6 message type field,
Each the byte definition of Fig. 7 OMCI warning message,
Fig. 8 alarm mask coding.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 3 is the checkout gear schematic diagram of the long luminance ONU that arranges of the present invention, and whether optical module is luminous according to its luminous tube, and outputs level signals TX_RSSI is generally high level and represents " luminous ", and low level represents " not luminous ".Vice versa.The checkout gear of long luminance ONU shown in Figure 3 comprises: be arranged at the optical module TRX1 of ONU end, for example, can select model is the optical module of RTXM169-504; GPON medium access controller (GPON MAC) IC1, for example, can select model is the GPON medium access controller of BL2340R; Flash chip IC 2, for example, can select model is the flash chip of S29GL128P11TF1V1; PMOS transistor T 1.Above-mentioned optical module TRX1, GPON medium access controller IC1, flash chip IC 2 all can select existing well-known device to consist of, and are not limited to above-mentioned specific embodiment.
Take above-mentioned concrete model as specific embodiment, the below further specifies the annexation of each components and parts:
The reception power supply VCC_Rx (pin 7) of optical module TRX1 and transmission power supply VCC_Tx (pin one 1) separate, receive power supply VCC_Rx and connect the 3.3v power supply, signal TX_RSSI (pin two 0) is the output signal of optical module, being used to refer to optical module has or not light signal to send, " 1 " expression has light signal output, ' 0 ' expression is without light signal output, and signal TX_RSSI exports to the pin GPIO2 (pin W4) of GPON medium access controller IC1.GPON medium access controller IC1 is built-in CPU, CPU open or turn-off the transmission power supply VCC_Tx of optical module by pin GPIO1 (pin B21) control PMOS transistor T 1.
The 1st pin of PMOS transistor T 1 is grid G, and it links to each other with the pin GPIO1 of GPON medium access controller IC1.The 2nd pin is source class S, directly links to each other with power supply 3.3V.The 3rd pin is drain D, links to each other with the transmission power supply VCC_Tx of optical module.
Light-emitting diode D1 (model is 2EF611) is long hair light alarm indication, represent to have the alarm of long hair light when bright, represent when not working without the alarm of long hair light, the positive pole of light-emitting diode D1 directly links to each other with power supply 3.3V, and negative pole meets the pin GPIO3 (pin B20) of GPON medium access controller IC1.
GPON medium access controller IC1 is by the 13rd pin of TX_EN signal (pin K1) control optical module TRX1, TX_EN is the transmission enable signal of optical module, this enable signal is provided by GPON medium access controller IC1, is linked into the transmission enable pin of optical module.In the ascending time slot that distributes, TRX1 is luminous for the control optical module, and in the ascending time slot of non-distribution, the control optical module stops luminous.OLT distributes different time slots for each ONU according to the bandwidth demand of ONU, and optical module TRX1 is luminous when TX_EN is " 0 ", and ONU sends upstream data in the time slot of oneself.Optical module TRX1 is not luminous when TX_EN is " 1 ", and ONU can not send upstream data.
GPON medium access controller IC1 reads and writes flash chip IC 2 by local bus (local data's bus).Described local bus is the data address read-write bus that general CPU controls peripheral chip, can adopt existing techniques in realizing, and this patent no longer describes in detail.
The firm powered on moment of ONU, the pin GPIO1 of GPON medium access controller IC1 is high-impedance state, and it is high level that pull-up resistor R2 makes the 1st pin grid of T1, transistor T 1 not conducting, pull down resistor R1 will send power supply VCC_Tx and be set to low level, and optical module TRX1 is not luminous without sending power supply.
The method of detecting long luminance ONU in passive optical network of the present invention need to use the checkout gear of long luminance ONU shown in Figure 3, and testing process can roughly be divided into following a few step:
Step 1: the ONU long hair light fault flag in the rear detection flash chip that powers on, the long hair light Reflector that is stored in the flash chip is used for indicating this ONU whether to be in long hair light when ONU pass electricity is restarted again, so that safeguard, long hair light fault flag does not send to OLT by the OMCI agreement, if long hair light fault flag is " 1 ", expression ONU is in the long hair light fault, lights the stand by lamp D1 on the ONU panel, indicate this ONU that failure light emission is arranged, need repairing.If long hair light fault flag is " 0 ", ONU begins to detect the signal TX_RSSI that optical module sends, and signal TX_RSSI pilot light module has or not light signal to send.For example: TRX1 (model is RTXM169-504) is the output signal of optical module from the signal TX_RSSI that pin two 0 sends, being used to refer to optical module has or not light signal to send, high level " 1 " expression has light signal output, and low level ' 0 ' expression is exported without light signal.
Step 2: when the TX_RSSI indication had light signal output, ONU judged whether the high-level retention time of signal TX_RSSI has surpassed the minimum taking turn cycle of EPON.
The measurement in the minimum taking turn cycle of EPON can realize in the steps below:
During normal operation, when optical module is actual luminous, signal TX_RSSI is the recurrent pulses waveform, its concrete duty ratio is according to the upstream bandwidth (its corresponding ascending time slot) of actual allocated and different, the upstream bandwidth that distributes is larger, and the high-level retention time of signal TX_RSSI is longer.When the optical module failure light emission, signal TX_RSSI is fixing high level.The maximum upstream bandwidth (1G bandwidth) that this ONU is distributed the PON system, the high-level retention time of measuring-signal TX_RSSI then, the minimum taking turn cycle that just can measure EPON.For example: take a GPON uplink frame as minimum-poll cycle (125us), the situation that certain ONU takies a uplink frame fully can not appear under normal circumstances, if the high-level retention time of the TX_RSSI of certain ONU has surpassed 125us, then can decision making.
Step 3: if surpassed the minimum taking turn cycle of EPON, the GPON medium access controller of ONU sends ID number and the alarm of long hair light of this ONU to OLT by the OMCI passage.
The GPON medium access controller of step 4: ONU by the OMCI agreement with long hair light alarm report OLT after, again with the long hair light fault flag set in the flash chip, the long hair light Reflector that is stored in the flash chip is used for indicating this ONU whether to be in long hair light when ONU pass electricity is restarted again, so that safeguard.
The transmission that ONU turn-offs optical module by the transmission power supply VCC_Tx that turn-offs optical module.
Step 5: if the determination result is NO in the step 2, the reset of long hair light fault flag.Return step 1 and continue to detect the signal TX_RSSI that optical module sends.
Fig. 4 is the concrete testing process of the checkout gear of long luminance ONU shown in Figure 3.
At first after ONU normally powers on, pin GPIO1=1 is set, transistor T 1 not conducting, it is closed condition that optical module sends power supply VCC_Tx,
The built-in CPU of GPON medium access controller links to each other with the flash chip by local bus bus, detects the long hair light fault flag in the flash chip,
If long hair light fault flag is " 1 ", expression ONU is in the long hair light fault, lights the stand by lamp D1 on the ONU panel.This moment, the GPON medium access controller arranged pin GPIO3 for " 0 ", lighted light-emitting diode D1.
If long hair light fault flag is " 0 ", expression ONU is not in the long hair light fault, and arrange GPIO1=0 this moment, and the transmission power supply VCC_Tx of optical module is opened in transistor T 1 conducting, and signal TX_RSSI produces thereupon,
By the GPIO2 pin of GPON medium access controller, the high-level retention time of TX_RSSI signal when whether the high-level retention time of detection signal TX_RSSI surpasses this ONU distribution maximum bandwidth,
If do not surpass, represent that then this ONU is luminous normal, remove the long hair light fault flag in the flash chip, continue to detect the TX_RSSI signal,
If surpass, represent that then long hair light fault occurs for this ONU, the GPON medium access controller by the OMCI agreement with this alarm report OLT,
The GPON medium access controller defines the message format that shows with this alarm report OLT with the alarm of long hair light by Fig. 7, specific description is seen the following course of work.
Then the GPON medium access controller is with the long hair light fault flag set in the flash chip.The set of long hair light fault flag represents that long hair light fault occurs this ONU.
Close the transmission power supply of optical module: pin GPIO1=1 is set, transistor T 1 not conducting, it is closed condition that optical module sends power supply VCC_Tx.
The below's minute several parts are illustrated the course of work of device shown in Figure 3:
During the one .ONU normal operation:
Because it is that different ascending time slots according to system assignment send data under normal circumstances that the PON system uplink adopts time division multiplexing principle, each ONU.The GPON medium access controller is by TX_EN signal controlling optical module, and when the ascending time slot of non-distribution, ONU should stop luminous, to avoid interference other ONU.Because the ascending time slot that each ONU distributes is not overlapping, so each ONU can up normal communication.
This moment, the TX_RSSI signal was periodic impulse waveform, and its concrete duty ratio is according to the upstream bandwidth (its corresponding ascending time slot) of actual allocated and different.
When the 2nd .ONU non-normal working is in the long hair light state:
This faulted ONU of all ascending time slots is all luminous, and this moment, the TX_RSSI signal of this long luminance ONU was long-term high level.It has occupied the ascending time slot of distributing to other ONU, therefore can cause the upstream data of other ONU obstructed, and then cause other normal ONU to go offline; And because normal ONU is only luminous at the ascending time slot of distributing to it, do not interfere with the ascending time slot of this long luminance ONU, so but this ONU normal communication also.Can carry out the mutual of OMCI agreement by OMCI passage and OLT.
The 3rd. the judgement of long hair light state:
Can judge whether to be in the long hair light state according to the level of TX_RSSI signal.Because during the ONU normal operation, the TX_RSSI signal is periodic impulse waveform, and different, the bandwidth of distribution is larger according to the upstream bandwidth (its corresponding ascending time slot) of actual allocated for its concrete duty ratio, and the high-level retention time of its TX_RSSI signal is longer.The high-level retention time of whether high-level retention time of judging signal TX_RSSI surpasses this ONU when distributing maximum bandwidth TX_RSSI signal judges whether to be in the long hair light state.
The 4th. the control of optical module
When the GPIO2 of GPON medium access controller pin, when detecting TX_RSSI and being long-term high level state, send a warning message to OLT by the OMCI agreement first, then the GPIO1 by the GPON medium access controller controls transistor T 1, and then the transmission power supply VCC_Tx of shutoff optical module, thereby luminous the stopping of assurance ONU optical module.
The 5th. the transmission of long hair light warning information
When the ONU judgement self is in the long hair light state, can be at first send a warning message and Port-ID number of ONU to OLT by the OMCI agreement, OLT can find this ONU ID according to Port-ID number, correspondence finds the sequence number of this ONU again, and then find corresponding ONU user's relevant information (as: home address at the customer management information platform of local side webmaster, contact methods etc.), being convenient to the operation and maintenance personnel locates rapidly fault, fixes a breakdown.
OMCI agreement (ONU manages control interface) is the standard agreement that OLT carries out control and management and alarm announcement in the GPON system to ONU, and it has special communication channel.The concrete message format of OMCI as shown in Figure 5.The OMCI tail field of type of message, 1 byte device identifier, 4 byte message identifiers, 32 byte message contents and 8 bytes that comprises things relevant identifier (TCI), 1 byte of GEM header, 2 bytes of 5 bytes.
The Port-ID that comprises the ONU that is addressed in the GEM heading.
Things relevant identifier (TCI) is used for a related request message and its response message, the priority of highest significant position Indication message among the TCI.
Message type field as shown in Figure 6, it comprises four parts, the 8th is highest significant position, keeps for purpose position (DB), in OMCI, this position is always 0.The 7th: (AR) confirmed in request, and whether be used to refer to this message needs to confirm.If need to confirm, this position is set to " 1 ", otherwise this position is " 0 ".Whether the 6th: confirm (AK), be used to refer to this message to the response message of an action request.If so, this position is set to " 1 ".If not, this position is set to " 0 ".The 5th to the 1st: type of message (MT), be used to refer to type of message, value is 16 expression alarm announcements.
Device identifier is fixed as 0X0A for GPON equipment.
Message identifier is used to refer to the target managed entity of required movement in the type of message, is the internal control entity, does not explain here.
The message content field format is relevant with concrete message.
The OMCI message tail is used for carrying out CRC check.
Fig. 7 is the specific descriptions from type of message (the 8th byte) to message content in the concrete message format of OMCI, message content the 14th byte to the 41 bytes are the alarm mask, as shown in Figure 8, each bit is for a kind of alarm mask of warning information sequence number, 224 bits are to there being the alarm mask of 224 warning information sequence numbers altogether, bit corresponding to defined alarm in the table of bits is set to " 0 " and then indicates corresponding alarm to remove, be set to " 1 " and then indicate alarm to produce, message content the 45th byte is for wanting the warning information sequence number of alarm.The alarm coding is the alarm of long hair light No. 223.It is 0X10 that the type of message byte value is set when the alarm of long hair light is arranged, and the device identifier byte is fixed as 0X0A, and the alarm mask of message content the 41st byte the 1st bit is set to 1 in the message format again, and the value of message content the 45th byte is made as 223.Fig. 7 is seen in whole arranging.By above OMCI protocol format the alarm of long hair light is sent to local side, allow the attendant can locate rapidly the fault point.
Claims (10)
1. the method for a detecting long luminance ONU in passive optical network is characterized in that:
Step 1: the ONU long hair light fault flag in the rear detection flash chip IC 2 that powers on if long hair light fault flag be " 1 ", represents that ONU is in the long hair light fault, lights the stand by lamp D1 on the ONU panel, indicates this ONU to need repairing; If long hair light fault flag is " 0 ", ONU begins to detect the signal TX_RSSI that optical module sends, and signal TX_RSSI pilot light module has or not light signal output;
Step 2: when the TX_RSSI indication had light signal output, ONU judged whether the high-level retention time of signal TX_RSSI has surpassed the minimum taking turn cycle of EPON;
Step 3: if the high-level retention time of signal TX_RSSI has surpassed the minimum taking turn cycle of EPON, the GPON medium access controller IC1 of ONU sends ID number and the alarm of long hair light of this ONU to OLT by the OMCI passage,
Step 4: GPON medium access controller IC1 by the OMCI agreement with long hair light alarm report OLT after, again with the long hair light fault flag set in the flash chip IC 2, the transmission that ONU turn-offs optical module by the transmission power supply VCC_Tx that turn-offs optical module,
Step 5: if the determination result is NO in the step 2, the reset of long hair light fault flag is returned step 1 and is continued to detect the signal TX_RSSI that optical module sends.
2. the method for detecting long luminance ONU in passive optical network as claimed in claim 1, it is characterized in that, the measurement in the minimum taking turn cycle of EPON realizes in the steps below: the maximum upstream bandwidth that this ONU is distributed the PON system, then the high-level retention time of measuring-signal TX_RSSI, the high-level retention time of the signal TX_RSSI that records is the minimum taking turn cycle of EPON.
3. the method for detecting long luminance ONU in passive optical network as claimed in claim 1 or 2, it is characterized in that: described ONU comprises optical module TRX1, GPON medium access controller IC1, flash chip IC 2, described GPON medium access controller IC1 is built-in CPU,
The reception power supply VCC_Rx of optical module TRX1 and transmission power supply VCC_Tx separate, and receive power supply VCC_Rx and connect the 3.3v power supply,
Optical module TRX1 will be used to refer to optical module and have or not the signal TX_RSSI of light signal transmission to send into GPON medium access controller IC1,
The transmission power supply VCC_Tx of optical module is opened or turn-offed to CPU control PMOS transistor T 1,
Resistance R 1 one end ground connection, the other end are connected to and send power supply VCC_Tx, and resistance R 2 one ends link to each other with power supply 3.3V, and the other end links to each other with GPON medium access controller IC1,
The stand by lamp D1 that is used for long hair light alarm indication links to each other with GPON medium access controller IC1,
GPON medium access controller IC1 provides to optical module TRX1 and sends enable signal TX_EN
GPON medium access controller IC1 reads and writes flash chip IC 2 by the bus local bus of local data.
4. the method for detecting long luminance ONU in passive optical network as claimed in claim 3, it is characterized in that: the model of described optical module TRX1 is RTXM169-504, the model of described GPON medium access controller IC1 is BL2340R, and the model of described flash chip IC 2 is S29GL128P11TF1V1
The 1st pin of PMOS transistor T 1 is grid G, and it links to each other with the pin GPIO1 of GPON medium access controller IC1; The 2nd pin is source class S, directly links to each other with power supply 3.3V; The 3rd pin is drain D, links to each other with the transmission power supply VCC_Tx of optical module.
5. the method for detecting long luminance ONU in passive optical network as claimed in claim 4, it is characterized in that: signal TX_RSSI sends into the pin GPIO2 of GPON medium access controller IC1 from the pin two 0 of optical module TRX1.
6. the method for detecting long luminance ONU in passive optical network as claimed in claim 4, it is characterized in that: resistance R 2 one ends link to each other with power supply 3.3V, and the other end links to each other with the pin GPIO1 of GPON medium access controller IC1.
7. the method for detecting long luminance ONU in passive optical network as claimed in claim 4, it is characterized in that: the positive pole of stand by lamp D1 directly links to each other with power supply 3.3V, and negative pole meets the pin GPIO3 of GPON medium access controller IC1.
8. the method for detecting long luminance ONU in passive optical network as claimed in claim 4, it is characterized in that: GPON medium access controller IC1 will send the 13rd pin that enable signal TX_EN sends to optical module TRX1 by pin K1.
9. the method for detecting long luminance ONU in passive optical network as claimed in claim 4, it is characterized in that: the firm powered on moment of ONU, the pin GPIO1 of GPON medium access controller IC1 is high-impedance state, it is high level that pull-up resistor R2 makes the 1st pin grid of PMOS transistor T 1, the 1 not conducting of PMOS transistor T, pull down resistor R1 will send power supply VCC_Tx and be set to low level, and optical module TRX1 is not luminous without sending power supply.
10. the method for detecting long luminance ONU in passive optical network as claimed in claim 4 is characterized in that:
Step 1: after ONU normally powers on, pin GPIO1=1 is set, the 1 not conducting of PMOS transistor T, it is closed condition that optical module sends power supply VCC_Tx,
The built-in CPU of GPON medium access controller IC1 links to each other with flash chip IC 2 by local bus bus, detect the long hair light fault flag in the flash chip IC 2, if long hair light fault flag is " 1 ", expression ONU is in the long hair light fault, light the stand by lamp D1 on the ONU panel: this moment, GPON medium access controller IC1 arranged pin GPIO3 for " 0 ", lighted stand by lamp D1, and expression ONU is in the long hair light fault, this ONU needs repairing
If long hair light fault flag is " 0 ", expression ONU is not in the long hair light fault, and arrange GPIO1=0 this moment, and the transmission power supply VCC_Tx of optical module is opened in 1 conducting of PMOS transistor T, and signal TX_RSSI produces thereupon,
Step 2: by the GPIO2 pin of GPON medium access controller IC1, the high-level retention time of TX_RSSI signal when whether the high-level retention time of detection signal TX_RSSI surpasses this ONU distribution maximum bandwidth,
Step 3: if do not surpass, the reset of long hair light fault flag is got back to step 2 and is continued to detect the TX_RSSI signal; If surpass, represent that then long hair light fault occurs this ONU, GPON medium access controller IC1 by the OMCI agreement with this alarm report OLT, when the ONU judgement self is in the long hair light state, at first pass through the OMCI agreement to Port-ID number of OLT transmission long hair light alarm and ONU, OLT is according to finding ID number of this ONU for Port-ID number, the corresponding sequence number that finds this ONU again, and then find corresponding ONU user's relevant information at the customer management information platform of local side webmaster; The message of OMCI agreement comprises the OMCI tail field of type of message, 1 byte device identifier, 4 byte message identifiers, 32 byte message contents and 8 bytes of things relevant identifier TCI, 1 byte of GEM header, 2 bytes of 5 bytes,
The Port-ID that comprises the ONU that is addressed in the GEM header,
Device identifier is fixed as 0X0A for GPON equipment,
Message content the 14th byte to the 41 bytes are the alarm mask, and the alarm coding is the alarm of long hair light No. 223, it is 0X10 that the type of message byte value is set when the alarm of long hair light is arranged, the alarm mask of message content the 41st byte the 1st bit is set to 1 in the message format again, the value of message content the 45th byte is made as 223, GPON medium access controller IC1 is exactly that OMCI agreement by above definition is with long hair light alarm report OLT
Step 4: GPON medium access controller IC1 by the OMCI agreement with long hair light alarm report OLT after, again with the long hair light fault flag set in the flash chip IC 2, the long hair light Reflector that is stored in the flash chip IC 2 is used for indicating this ONU whether to be in long hair light when ONU pass electricity is restarted again, so that safeguard, long hair light fault flag does not send to OLT by the OMCI agreement
Close the transmission power supply of optical module: pin GPIO1=1 is set, the 1 not conducting of PMOS transistor T, it is closed condition that optical module sends power supply VCC_Tx,
Step 5: if the determination result is NO in the step 2, the reset of long hair light fault flag is returned step 1 and is continued to detect the signal TX_RSSI that optical module sends.
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