CN101651492A - Remote transmission device, remote transmission system and abnormal luminous fault processing method for optical access network - Google Patents
Remote transmission device, remote transmission system and abnormal luminous fault processing method for optical access network Download PDFInfo
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Abstract
The embodiment of the invention provides a remote transmission device, a remote transmission system and an abnormal luminous fault processing method for an optical access network. The remote transmission device mainly comprises an EB (extender board); the EB is arranged among a plurality of optical network devices at a user side and an OLT at a network side; the optical network devices at the userside are detected through uplink optical signals sent by optical access physical ports; and the optical network devices at the user side correspond to the optical access physical ports one by one. The EB judges whether the abnormal luminous phenomenon appears in the optical access physical ports or not according to a detection result so as to determine the information of the optical network device with abnormal luminescence at the user side and cut off an uplink channel of the optical network device with the abnormal luminescence at the user side. The utilization of the device, the system andthe method can accurately position which ONU or ONT is wrong when ONUs or ONTs perform the abnormal luminescence, thereby ensuring that the whole PON network can effectively resist the abnormal luminescence of the ONUs or the ONTs.
Description
Technical Field
The present invention relates to the field of optical networks, and in particular, to a remote transmission apparatus and system for an optical access network, and an abnormal light emitting fault handling method.
Background
A Passive Optical Network (PON) technology is an Optical access technology in a point-to-multipoint (P2 MP) mode, and is composed of an Optical Line Termination (OLT), an Optical splitter, an Optical Network Unit (ONU)/an Optical Network Terminal (ONT), and an Optical fiber connecting the ONU and the ONT.
The OLT is used as a local side device and is connected with the optical branching device through a trunk optical fiber, and the optical branching device is connected with each ONU or ONT through each independent branch optical fiber. In the downlink direction, the optical splitter realizes the optical splitting function and sends the downlink optical signals from the OLT to each ONU or ONT through the branch optical fiber; in the uplink direction, the optical splitter realizes an optical signal convergence function, converges uplink optical signals sent by each ONU or ONT, and sends the converged uplink optical signals to the OLT through the trunk fiber. In order to ensure that uplink optical signals transmitted by each ONU or ONT in the uplink direction do not collide, the OLT must measure the distance of each ONU or ONT, control the Time and duration that each ONU or ONT occupies the uplink optical link according to the measurement result, and meanwhile, each ONU or ONT must transmit uplink data in a burst Time Division Multiple Access (TDMA).
Under normal conditions, each ONU or ONT occupies an uplink channel according to a time slot authorized by the OLT and sends an uplink optical signal, and no signal collision occurs on the uplink channel of the PON. However, when the ONU or the ONT fails and randomly or permanently occupies the upstream channel according to the time slot authorized by the OLT, or a malicious ONU or ONT randomly occupies the upstream channel and sends an upstream optical signal, the PON will fall into a breakdown state. In the existing method, fault detection and troubleshooting are performed in the OLT, and since the optical splitter converges uplink optical signals transmitted by each ONU or ONT, it is impossible to accurately locate which ONU or ONT has a problem.
Disclosure of Invention
Embodiments of the present invention provide a remote transmission device and system for an optical access network, and an abnormal light emission fault handling method, so as to solve a problem that a PON cannot work normally when an ONU or an ONT generates abnormal light emission.
The embodiment of the invention is realized by the following technical scheme:
an extender device EB of an optical access network, which is an active device and includes an optical amplification device and/or an optoelectronic-to-optical conversion device, where the EB provides a plurality of optical access physical ports, each of the optical access physical ports is connected to an optical network device on a user side through an optical fiber, the EB couples uplink optical signals received from the plurality of optical access physical ports, sends the coupled uplink optical signals to an optical line terminal OLT on the network side, decomposes downlink optical signals sent from the OLT, and sends the decomposed downlink optical signals to the optical network devices on the user sides through the optical fibers, and the EB further includes:
an abnormal light emission phenomenon detection module, configured to detect an uplink optical signal sent by an optical network device on a user side to the EB through an optical access physical port, determine whether an abnormal light emission phenomenon occurs in the optical access physical port according to a detection result, send information of the optical access physical port in which the abnormal light emission phenomenon occurs to an abnormal light emission port management module, and send a command for cutting off an uplink channel of the optical access physical port in which the abnormal light emission phenomenon occurs;
and the abnormal light-emitting port management module is used for managing the optical access physical port information with the abnormal light-emitting phenomenon transmitted by the abnormal light-emitting phenomenon detection module and reporting the optical access physical port with the abnormal light-emitting phenomenon and/or the optical network equipment information of the user side corresponding to the optical access physical port with the abnormal light-emitting phenomenon to the OLT.
An optical communication system includes an Optical Line Terminal (OLT) disposed at a network side and a plurality of optical network devices disposed at a user side, wherein the OLT and the optical network devices at the user side are connected by a point-to-multipoint optical distribution network, and the point-to-multipoint optical distribution network includes: extender device EB according to any one of claims 1 to 5.
A method for processing abnormal light-emitting fault of optical access network, the optical access network includes extender device EB, the EB is disposed between a plurality of optical network devices of user side and optical line terminal OLT of network side, the method includes:
the EB detects uplink optical signals sent by optical network equipment at a user side through an optical access physical port, and the optical network equipment at the user side corresponds to the optical access physical port one by one;
the EB judges whether an abnormal light emitting phenomenon occurs in the optical access physical port or not according to a detection result;
and the EB determines the information of the optical network equipment at the abnormally luminous user side according to the optical access physical port with the abnormal luminous phenomenon, and cuts off the uplink channel of the optical network equipment at the abnormally luminous user side.
It can be seen from the above technical solutions that, in the embodiments of the present invention, an EB provides a plurality of optical access physical ports, and each optical access physical port is connected to an optical network device on a user side through an optical fiber, so that the entire PON network can effectively resist abnormal light emission of the optical network device on the user side.
Drawings
Fig. 1 is a schematic diagram of a network architecture of an LR-PON according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a remote transmission system of a PON according to an embodiment of the present invention;
fig. 3a is a schematic structural diagram of an OA-based EB according to a second embodiment of the present invention;
fig. 3b is a schematic structural diagram of an OA-based EB according to a second embodiment of the present invention;
fig. 3c is a schematic structural diagram of an OA-based EB according to a second embodiment of the present invention;
fig. 3d is a schematic structural diagram of an OA-based EB according to a second embodiment of the present invention;
fig. 4a is a schematic structural diagram of an EB based on Optical-Electrical-Optical (OEO) according to a third embodiment of the present invention;
fig. 4b is a schematic structural diagram of an EB based on OEO according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an EB based on OEO and combined with ethernet technology according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of an EB based on a mixture of OA and OEO according to a third embodiment of the present invention.
Detailed Description
In the embodiment of the present invention, an Extender Box (EB, Extender Box) is disposed in a point-to-multipoint optical distribution network between an OLT on a network side and a plurality of optical network devices on a user side, where the EB is an active device and includes an optical amplification device and/or a photoelectric optical conversion device, and provides a plurality of optical access physical ports, each optical access physical port is connected to an optical network device on the user side through an optical fiber, couples uplink optical signals received from the plurality of optical access physical ports, and then sends the coupled uplink optical signals to the OLT, and decomposes downlink optical signals sent by the OLT, and then sends the decomposed downlink optical signals to the optical network devices on each user side through each optical fiber.
Further, the EB detects an uplink optical signal sent by the optical network device at the user side through the optical access physical port, determines whether an abnormal light emission phenomenon occurs in the optical access physical port according to a detection result, sends the optical access physical port information in which the abnormal light emission phenomenon occurs and/or the optical network device at the user side corresponding to the optical access physical port to the OLT, and cuts off an uplink channel of the optical access physical port in which the abnormal light emission phenomenon occurs;
further, the OLT receives the information of the optical network device at the optical access physical port where the abnormal light emission occurs and/or the optical network device information at the user side corresponding to the optical access physical port reported by the EB, determines the optical network device at the user side where the abnormal light emission occurs, and instructs the optical network device at the user side where the abnormal light emission occurs to stop sending the uplink optical signal, and still opens the downlink channel of the optical network device at the user side where the abnormal light emission occurs.
Further, the EB also provides a designated PON port to connect to an optical splitter, which in turn is connected to a plurality of optical network devices on the subscriber side.
The optical network device at the user side includes: ONU or ONT.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
Example one
A network architecture of a Long-distance passive Optical network (LR-PON) is shown in fig. 1, in which an EB is added to an Optical transmission path, and an Optical power Amplifier (OA) or an Optical-Electrical-Optical converter (OEO) is integrated in the EB. The topology between the EP and the ONU is P2MP, so the topology between the OLT and the ONU is still P2 MP.
In order to support the long-distance data transmission between the OLT and the ONU, the optical signal in the optical fiber needs to be amplified, and the architecture of the remote transmission system of the PON proposed by this embodiment is shown in fig. 2. The architecture includes: ONU/ONT, optical branching device, EB and OLT.
The EB is an active device, and provides a plurality of optical access physical ports, (for example, ports 1 to m in fig. 2) as PON ports of a backhaul of a base station, each of the optical access physical ports is connected to one ONU through one branch optical fiber, and the optical access physical ports and the ONUs have a one-to-one correspondence relationship, that is, a topology structure in which the EB and the ONUs used as the backhaul of the base station are connected by point-to-point (P2P, Peer-to-Peer) is adopted. When the PON is used as a backhaul of the base station, the PON is used as a transmission technology rather than a simple access technology, and at this time, the security requirement for the PON is much higher than that for the PON being used as a simple access technology, and an operator particularly requires that the PON and the base station can still normally operate when the above-mentioned ONU or ONT emits abnormal light.
The EB also provides a port (e.g., port h in fig. 2) as a PON port for home subscriber access, and the PON port is connected to an optical splitter, which is further connected to a plurality of home subscriber ONTs. I.e. the topology of the P2MP connection between the EB and the ONTs of individual home subscribers, is still used to save fibre routing. The EB is connected with the OLT through a trunk optical fiber.
The P2P connection between each ONU and the EB can be an ethernet physical layer connection, or an ethernet physical layer connection between the EB and the OLT can be adopted, but a data link layer between the OLT and the ONU adopts a data link layer of PON.
The main functions of the EB described above include: the uplink optical signals sent by each ONU or ONT are converged and then sent to the OLT, and the downlink optical signals sent by the OLT are decomposed and then sent to each ONU or ONT respectively through each branch optical fiber.
Performing optical detection on each optical access physical port or PON port, and cutting off an uplink channel of a certain optical access physical port or PON port when detecting that the certain optical access physical port or PON port has abnormal light emission; and reporting the optical access physical port or PON port with the abnormal light emission phenomenon and/or the ONU corresponding to the optical access physical port to the OLT.
When the port with the abnormal light-emitting phenomenon is the optical access physical port serving as the return stroke of the base station, only the uplink channel of one ONU corresponding to the optical access physical port is cut off, so that the ONU with the abnormal light-emitting phenomenon is prevented from continuously illegally occupying the uplink channel and has no influence on other ONUs or the uplink channels of ONTs; when the port with the abnormal light emission phenomenon is the PON port accessed as the home subscriber, the uplink channels of the ONTs of the plurality of home subscribers including the ONT with the abnormal light emission are simultaneously cut off, and the uplink channels of the PON ports corresponding to the ONUs serving as the backhaul of the base station are not affected.
The specific structure of the EB will be described in detail in the following examples.
The main functions of the OLT include: and receiving the optical access physical port with the abnormal light emission phenomenon reported by the OLT and/or the ONU corresponding to the optical access physical port, determining the ONU with the abnormal light emission, and commanding the ONU to stop sending the uplink optical signal. And measuring the distance of each ONU and ONT, and distributing the time and duration for occupying the uplink channel to each ONU and ONT according to the distance measurement result. The method comprises the following steps: exception handling module and range finding processing module.
The abnormal processing module is used for receiving the optical network equipment information of the optical access physical port with the abnormal light emitting phenomenon reported by the EB and/or the optical network equipment information of the user side corresponding to the optical access physical port, determining the ONU with the abnormal light emitting, and commanding the ONU with the abnormal light emitting to stop sending the uplink optical signal;
the ranging processing module is used for ranging each ONU and ONT, and allocating the starting time and the duration of occupying the uplink channel to each ONU and ONT according to the ranging result.
Example two
The schematic structural diagrams of OA-based EBs provided in this example are shown in fig. 3a, 3b, 3c, and 3 d.
In fig. 3a, 3b, 3c and 3d, the EB consists of a splitter (Tap), a diplexer, an Optical splitter, an Optical switch, an Optical Detector (OD), an inline ONT, an upstream Optical splitter or Wavelength Division Multiplexer (WDM), a downstream Optical splitter or WDM, an upstream OA (Optical power amplifier) and a downstream OA. The diplexer can be a loop-back device or a WDM, each optical signal split by the optical splitter is equal, and each optical signal split by the Tap is not necessarily equal, preferably, the Tap can couple out only a small part of light for detection, thereby saving energy. In fig. 3a, the ONU uses the same wavelength for both uplink and downlink, and uses an optical splitter; in fig. 3b, the ONU uses the same wavelength for upstream, and uses the optical splitter, and uses different wavelengths for downstream, and uses WDM; in fig. 3c, the ONU uses different wavelengths upstream, WDM for downstream, the same wavelength for downstream, and optical splitter; in fig. 3d, the ONU uses different wavelengths upstream and downstream, and WDM is used.
The EB in fig. 3 connects a PON port corresponding to an ONT as a home subscriber access in addition to a PON port corresponding to an ONU as a backhaul of a base station.
And the Tap is used for receiving an uplink optical signal sent by the ONU/ONT to the EB through the PON port, branching a part of optical signal from the uplink optical signal and sending the optical signal to the OD. Each PON port corresponds to one Tap, and each Tap corresponds to one OD.
And the OD is used as an abnormal light-emitting phenomenon detection module in the EB and used for carrying out light detection on the optical signal transmitted by the Tap, judging whether the optical access physical port receiving the optical signal has an abnormal light-emitting phenomenon or not according to the detection result, and sending a command for cutting off an uplink channel of the optical access physical port to the optical switch and sending the information of the optical access physical port with the abnormal light-emitting phenomenon to the embedded ONT after judging that the optical access physical port has the abnormal light-emitting phenomenon.
The embedded ONT is used as an abnormal light emitting port management module in the EB and used for managing the optical access physical port information which is transmitted by each OD and has the abnormal light emitting phenomenon, and reporting the optical access physical port which has the abnormal light emitting phenomenon and/or the ONU information corresponding to the optical access physical port to the OLT through the trunk optical fiber.
An embedded ONT is arranged in one EB, the embedded ONT is respectively connected with each OD, and the OLT can manage and configure each OD through the embedded ONT. Optionally, the embedded ONT provides, for the OD, time and duration information that the OLT allocates to the ONU under each optical access physical port to occupy the upstream optical channel.
And the optical switch is arranged between the duplexer and the optical splitter and used for cutting the uplink channel of the corresponding optical access physical port after receiving the command of cutting the optical access physical port transmitted by the OD, so that the EB does not receive the optical signal transmitted by the uplink channel of the corresponding optical access physical port any more. In practical applications, the optical switch may also be located between Tap and the duplexer.
And the duplexer is used for realizing single-fiber bidirectional transceiving.
The uplink optical splitter or the uplink WDM is used for receiving the uplink optical signals from each ONU or ONT, converging the uplink optical signals and then sending the converged uplink optical signals to the uplink OA;
the uplink OA is used for receiving an uplink optical signal sent by the uplink optical splitter or the uplink WDM, amplifying the uplink optical signal and sending the amplified uplink optical signal to the OLT;
the downlink OA is used for receiving the downlink optical signal sent by the OLT, amplifying the uplink optical signal and sending the amplified uplink optical signal to the downlink optical splitter or the WDM;
and the downlink optical splitter or the downlink WDM is used for receiving the downlink optical signal sent by the downlink OA, splitting the downlink optical signal and then respectively sending the split downlink optical signal to each ONU or ONT.
The processing of the EB in fig. 3 described above is as follows:
in the uplink direction, the Tap receives an uplink optical signal sent from the ONU/ONT to the EB through the port, branches a small portion of the optical signal from the uplink optical signal, and sends the optical signal to the OD. Tap sends most of the received upstream optical signals to the diplexer, which sends the received upstream optical signals to the upstream optical splitter (or WDM). The uplink optical splitter (or WDM) converges the received uplink optical signals from each PON port and sends them to the uplink OA, and the uplink OA amplifies the received uplink optical signals and sends them to the OLT through the trunk fiber.
In the downstream direction, the downstream OA amplifies a downstream optical signal transmitted from the OLT and transmits the amplified signal to a downstream optical splitter (or WDM). The downstream optical splitter (or WDM) separates the received downstream optical signals and sends the separated downstream optical signals to each ONU/ONT through the duplexer and Tap.
The OD is equivalent to an OLT receiver, and after receiving the upstream optical signal transmitted by the Tap, identifies and detects the upstream optical signal, and determines whether an abnormal light emission phenomenon occurs at a PON port transmitting the upstream optical signal.
The method for the EB to identify and detect the uplink optical signal sent by the ONU through the optical access physical port comprises the following steps:
1. the OD analyzes a physical layer signal or a Media Access Control (MAC) signal in the uplink optical signal, and when a frame structure of the physical layer signal or the MAC layer signal cannot be analyzed, it is determined that an abnormal light emission phenomenon exists in an optical access physical port through which the uplink optical signal is transmitted, that is, an ONU corresponding to the optical access physical port emits light abnormally.
2. The OLT provides the time and duration that the ONU occupies the uplink under each optical access physical port of the EB by the embedded ONT, for example, the embedded ONT provides the time and duration that the OLT allocates to the ONU1 under the optical access physical port 1 to occupy the uplink for OD1, provides the time and duration that the OLT allocates to the ONUm under the optical access physical port m to occupy the uplink for ODm, and provides the time and duration that the OLT allocates to the ONTm +1, ONTm +2, and ONTn under the optical access physical port h to occupy the uplink for ODh.
The OD measures the power and the error rate of an uplink optical signal sent by an optical access physical port through the ONU in a corresponding time slot according to the preset time and duration of the uplink optical channel occupied by the ONU, compares the measurement result with a preset threshold value, and judges whether an abnormal light-emitting phenomenon exists in the optical access physical port according to the comparison result; or the OD reports the measurement result of the power and the bit error rate of the optical signal to the OLT through the embedded ONT, the OLT judges whether the abnormal light-emitting phenomenon exists in the optical access physical port according to the measurement result, and then the OD is informed of the judgment result through the embedded ONT.
And after judging that the ONU corresponding to the optical access physical port of the uplink optical signal emits light abnormally, the OD sends a command for cutting off the optical access physical port to the optical switch, the optical switch cuts off an uplink channel of the optical access physical port after receiving the command, and the OD also sends the information of the optical access physical port with the abnormal light emission phenomenon to the embedded ONT.
The embedded ONT manages the optical access physical port information which is transmitted by each OD and has the abnormal light-emitting phenomenon, and reports the optical access physical port or the PON port which has the abnormal light-emitting phenomenon and/or the ONU corresponding to the optical access physical port to the OLT.
And the OLT receives the optical access physical port or PON port on the EB with the abnormal light emission phenomenon reported by the embedded ONT and/or the ONU corresponding to the optical access physical port. If the ONU with abnormal light emission appears on the optical access physical port which is used as the return stroke of the base station, at the moment, the OLT/EB can immediately position the ONU with abnormal light emission, the uplink channel of the optical access physical port of the ONU with abnormal light emission can be cut off in time through the optical switch, and then the OLT can control the ONU with abnormal light emission to stop sending uplink optical signals through a down command. At this time, the upstream path to the PON port of the other ONU/ONT is not affected, and the downstream path to the ONU which abnormally emits light is still kept open.
If the ONT which is abnormally luminous is judged to appear on the PON port which is accessed by the home subscriber, the uplink path of the PON port which is abnormally luminous can be cut off in time through the optical switch, and the downlink path of the PON port which is abnormally luminous is still kept smooth.
Then, the OLT may control all ONTs below the abnormally-lit PON port to stop sending the uplink optical signal by a down command, and record the total optical power value at that time.
And when the total optical power value is 0, the OLT commands the ONTs under the abnormal luminous PON port to send uplink optical signals one by one, analyzes the uplink optical signals sent by each ONT through the OD, and if the uplink optical signals sent by the ith ONT cannot be analyzed, judges that the ONT is the abnormal luminous ONT.
When the total optical power value is not 0, the OLT commands the ONTs under the abnormal luminous PON port to send uplink optical signals one by one, then the total optical power values before and after comparison are compared, and if the total optical power value is not changed, the ONT is judged to be the abnormal luminous ONT; and if the ONT is changed, commanding the ONT to stop sending the uplink optical signal, and continuing the detection of the next ONT until the ONT which emits abnormal light is located.
EXAMPLE III
The structure of an EB based on Optical-Electrical-Optical (OEO) provided in this embodiment is schematically illustrated in fig. 4a and 4 b.
In fig. 4a, the EB consists of a diplexer, an Optical splitter, an Optical receive module (RX), an Optical transmit module (TX), an OD, an Optical Time Domain Reflectometer (OTDR), an electrical convergence (MUX) module, an electrical distribution (DeMUX) module, and an embedded ONT.
The process for EB shown in FIG. 4a is as follows:
and the uplink RX receives an uplink optical signal sent to the EB by the ONU/ONT through a port and converts the uplink optical signal into an uplink electric signal. The uplink RX may convert the PON physical layer optical signal into a PON physical layer electrical signal, and regenerate and add a preamble, or terminate the PON physical layer to obtain a PON uplink MAC frame, which is equivalent to embedding a receiving processing module of the OLT. And the uplink RX sends the obtained uplink PON physical layer electrical signal or the PON uplink MAC frame to the electrical aggregation module.
The electric convergence module is used for converging the electric signals of the multiple paths into one electric signal. The electric convergence module may synthesize a plurality of PON physical layer electric signals into one PON physical layer electric signal in a TDM manner, or synthesize a plurality of PON uplink MAC frames into one PON uplink MAC frame in a TDM manner. And the electric convergence module sends the obtained PON physical layer electric signal or PON uplink MAC frame to an uplink TX.
The upstream TX is used to convert electrical signals into optical signals and send the optical signals to the OLT. The uplink TX may convert a PON physical layer electrical signal from the electrical aggregation module into a PON physical layer optical signal to be transmitted, or perform PON physical layer processing on a PON uplink MAC frame from the electrical aggregation module and then transmit the optical signal to the OLT.
The upstream RX also branches a small portion of the received upstream optical signal to send to the OD. The OD carries out identification detection on the received uplink optical signal and judges whether an optical access physical port transmitting the uplink optical signal generates abnormal light emission or not. The method for OD to identify and detect the uplink optical signal may be the same as the method described in the second embodiment. And when the OD identifies the optical access physical port which emits abnormal light, the OD sends a command for cutting off the optical access physical port to the uplink RX, after receiving the command, the uplink RX cuts off an uplink channel of the optical access physical port, and the OD also sends the optical access physical port which emits the abnormal light phenomenon to the embedded ONT.
The downlink RX sends the received downlink optical signal from the OLT to the electrical distribution module. The electrical distribution module is configured to divide the one path of electrical signal into multiple paths of electrical signals, and may divide the one path of PON downlink physical layer electrical signal into multiple paths of PON downlink physical layer electrical signals in a TDM manner, or divide the one path of PON downlink MAC frame into multiple paths of electrical signals in a TDM manner. And the electric distribution module sends the obtained multi-channel downlink electric signals to each downlink TX respectively. And the downlink TX converts the received downlink electric signal into a downlink optical signal and sends the downlink optical signal to each ONU/ONT.
The OTDR module is disposed at an optical access physical port serving as a backhaul of the base station, and sends optical pulses to the PON port through the downlink TX, and the OD measures OTDR reflected signals returned from the optical access physical port, where the OTDR reflected signals include optical signals of rayleigh scattering and fresnel reflection, and reports the measurement result to the OTDR module. The OTDR module can locate each individual event on the link from EB to ONU according to the measurement result reported by OD, including events such as attenuation, reflection, and failure of connector, splice, optical splitter, and coupler. The OTDR measurement result may also be reported to the OLT through an embedded ONT, so as to support the OLT to perform optical line diagnosis.
The OTDR is arranged on the side of the optical access physical port, and the technical problem that when the OTDR is arranged on the OLT, signals reflected by each branch optical fiber are overlapped, and the branch optical fibers cannot be distinguished is solved.
The P2P connection between the ONU and the EB can be an ethernet physical layer connection, and the EB and the OLT can also be an ethernet physical layer connection, but the data link layer between the OLT and the ONU adopts the data link layer of PON.
The EB shown in fig. 4a described above can be combined with ethernet technology to obtain an EB as shown in fig. 5. In the EB, RX is an ethernet reception module (ETH RX), TX is an ethernet transmission module (ETH TX), and the electric aggregation and distribution module is a LAN SW (LAN Switch) module. The basic process of this EB is the same as that of the EB shown in fig. 4 a.
In the EB shown in fig. 4b, the uplink OA in fig. 3a is replaced by the uplink RX and uplink TX, and the downlink OA in fig. 3a is replaced by the downlink RX and downlink TX. In the EB based on OA mixed with OEO shown in fig. 6, the downlink OA in fig. 3a is replaced by only the downlink RX and downlink TX, leaving the uplink OA unchanged. The basic processing procedure of the EB shown in fig. 4b and fig. 6 is the same as that of the EB shown in fig. 3 a.
In summary, in the embodiments of the present invention, by using a P2P topology structure between the optical access physical port as the backhaul of the base station and the ONUs, when abnormal light emission occurs in the ONU device, the EB can accurately locate which ONU has a problem, so that the entire PON network and the base station can effectively resist the abnormal light emission of the ONU device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An extender device EB of an optical access network, the extender device EB being an active device including an optical amplifying device and/or an optical-electrical-optical converting device, the EB providing a plurality of optical access physical ports, each of the optical access physical ports being connected to an optical network device on a user side through an optical fiber, the EB coupling uplink optical signals received from the plurality of optical access physical ports and then sending the coupled uplink optical signals to an optical line terminal OLT on the network side, and splitting downlink optical signals sent from the OLT and then sending the split downlink optical signals to the optical network device on each user side through each optical fiber, the EB further comprising:
an abnormal light emission phenomenon detection module, configured to detect an uplink optical signal sent by an optical network device on a user side to the EB through an optical access physical port, determine whether an abnormal light emission phenomenon occurs in the optical access physical port according to a detection result, send information of the optical access physical port in which the abnormal light emission phenomenon occurs to an abnormal light emission port management module, and send a command for cutting off an uplink channel of the optical access physical port in which the abnormal light emission phenomenon occurs;
and the abnormal light-emitting port management module is used for managing the optical access physical port information with the abnormal light-emitting phenomenon transmitted by the abnormal light-emitting phenomenon detection module and reporting the optical access physical port with the abnormal light-emitting phenomenon and/or the optical network equipment information of the user side corresponding to the optical access physical port with the abnormal light-emitting phenomenon to the OLT.
2. The EB of claim 1 further comprising:
the optical switch is used for cutting off the uplink channel of the corresponding optical access physical port according to the uplink channel command for cutting off the optical access physical port sent by the abnormal light-emitting phenomenon detection module, so that the EB does not receive the uplink optical signal transmitted by the uplink channel of the corresponding optical access physical port any more;
and the splitter is used for receiving an uplink optical signal sent to the EB by the optical network equipment at the user side through the optical access physical port, splitting part of the optical signal from the uplink optical signal and sending the optical signal to the abnormal light-emitting phenomenon detection module.
3. The EB according to claim 2, wherein the anomalous luminescence phenomenon detection module specifically comprises: at least one of a light analysis judging module and a time slot checking judging module;
the optical analysis judging module is used for analyzing a physical layer signal or a Media Access Control (MAC) layer signal in a received uplink optical signal, and judging that an abnormal light emitting phenomenon exists in an optical access physical port for transmitting the uplink optical signal when the frame structure of the physical layer signal or the MAC layer signal cannot be analyzed;
the time slot checking and judging module is used for acquiring an uplink optical signal sent by the optical network equipment at the user side through an optical access physical port according to the preset initial time and duration of the uplink optical channel occupied by the optical network equipment at the user side, measuring the power and the error rate of the uplink optical signal and judging whether an abnormal light emitting phenomenon exists in the optical access physical port according to the measurement result; or sending the measurement result to an abnormal light-emitting port management module, reporting the measurement result to the OLT by the abnormal light-emitting port management module, and receiving a judgment result of whether the optical access physical port sent by the OLT through the abnormal light-emitting port management module has an abnormal light-emitting phenomenon.
4. The EB of claim 2 further comprising:
a duplexer for receiving the optical signal which is separated from the uplink optical signal by the splitter and transmitted, and transmitting the optical signal to an optical splitter or a wavelength division multiplexer; receiving an optical signal sent by an optical splitter or a wavelength division multiplexer, and sending the optical signal to optical network equipment at a user side through an optical fiber;
and the optical splitter or the wavelength division multiplexer is used for coupling the optical signals sent by each duplexer, then sending the optical signals to the OLT, and respectively sending the downlink optical signals sent by the OLT to each duplexer after decomposing the downlink optical signals.
5. The EB of claim 1 further comprising:
the optical network equipment at the user side is connected with the EB by adopting an Ethernet physical layer, the EB is connected with the OLT by adopting the Ethernet physical layer, and the OLT and the optical network equipment at the user side adopt a data link layer of the PON.
6. An optical communication system, comprising an optical line terminal OLT disposed at a network side and a plurality of optical network devices disposed at a user side, wherein the OLT and the optical network devices at the user side are connected via a point-to-multipoint optical distribution network, and the point-to-multipoint optical distribution network comprises: extender device EB according to any one of claims 1 to 5.
7. The optical communication system of claim 6,
the EB reports information of the optical access physical port with abnormal light emission and/or the optical network equipment of the user side corresponding to the optical access physical port to the OLT;
the OLT specifically includes:
the abnormal processing module is used for receiving the optical network equipment information of the optical access physical port with the abnormal light emitting phenomenon reported by the EB and/or the optical network equipment information of the user side corresponding to the optical access physical port, determining the optical network equipment of the user side with the abnormal light emitting phenomenon, and commanding the optical network equipment of the user side with the abnormal light emitting phenomenon to stop sending the uplink optical signal;
and the ranging processing module is used for ranging the optical network equipment of each user side and distributing the initial time and the duration for occupying the uplink channel to the optical network equipment of each user side according to the ranging result.
8. A method for processing abnormal light-emitting fault of optical access network is characterized in that the optical access network comprises an extender device EB, the EB is arranged between a plurality of optical network devices at user side and an optical line terminal OLT at network side, the method comprises:
the EB detects uplink optical signals sent by optical network equipment at a user side through an optical access physical port, and the optical network equipment at the user side corresponds to the optical access physical port one by one;
the EB judges whether an abnormal light emitting phenomenon occurs in the optical access physical port or not according to a detection result;
and the EB determines the information of the optical network equipment at the abnormally luminous user side according to the optical access physical port with the abnormal luminous phenomenon, and cuts off the uplink channel of the optical network equipment at the abnormally luminous user side.
9. The method according to claim 8, wherein the EB detects an uplink optical signal sent from an optical network device on a user side through an optical access physical port, and determines whether an abnormal light emission phenomenon occurs in the optical access physical port according to a detection result, including:
the EB analyzes a physical layer signal or an MAC layer signal in the received uplink optical signal, and when the frame structure of the physical layer signal or the MAC layer signal cannot be analyzed, the EB judges that an abnormal light-emitting phenomenon exists in an optical access physical port for transmitting the uplink optical signal;
or,
the EB acquires an uplink optical signal sent by the optical network equipment of the user side through an optical access physical port according to the preset initial time and duration of the uplink optical channel occupied by the optical network equipment of the user side, measures the power and the error rate of the uplink optical signal, and judges whether the optical access physical port has an abnormal light emitting phenomenon according to the measurement result; or reporting the measurement result to the OLT, and receiving a judgment result of whether the abnormal light-emitting phenomenon exists in the optical access physical port sent by the OLT.
10. The method according to claim 8 or 9, characterized in that the method further comprises:
the EB reports information of an optical access physical port with abnormal light emission and/or optical network equipment arranged at a user side corresponding to the optical access physical port to the OLT;
and after the OLT determines that the optical network equipment at a certain user side abnormally emits light, the OLT commands the optical network equipment at the user side to stop sending the uplink optical signal and still open a downlink channel of the optical network equipment at the user side.
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