Uplink time slot confliction detection method and optical line terminal in passive optical network
A passive optical network and optical line terminal technology, applied in the field of optical line terminal and uplink time slot conflict detection, can solve the problems of increased system cost, inconvenient system operation and maintenance, and increased system operation and maintenance complexity, and achieves a reduction in cost, avoidance of time slot conflicts, and the effect of facilitating operation and maintenance
Inactive Publication Date: 2008-02-20
HUAWEI TECH CO LTD
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[0006] However, one OLT can be connected to multiple ODNs, and one ODN can be connected to multiple ONTs. The number of ONTs is extremely large. If a protection circuit is added to each ONT, it will easily cause a sharp increase in system costs and is not convenient for system maintenance. Operation and Maintenance
In addition, using the ONT self-detection method, the ONT will automatically turn off the optical transmitter when it detects a fault, but at this time the OLT cannot judge the reason why the ONT has no uplink data transmission, which also increases the system operation and maintenance to a certain extent. the complexity
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[0061] The basic idea of the present invention is: the OLT detects whether a time slot conflict occurs in the uplink time slot.
[0062] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0063] Referring to Fig. 5, the uplink timeslot collision detection method provided by the present invention may include the following steps:
[0064] Step 501: The OLT samples the instantaneous optical power of the uplink time slot.
[0065] Step 502: The OLT judges whether the instantaneous optical power obtained by sampling exceeds the normal uplink optical power of the uplink time slot, and if yes, executes step 503; otherwise, executes step 504.
[0066] Step 503: Determine that a time slot conflict occurs in the uplink time slot, and end the processing of this flow.
[0067] Step 504: Determine that the uplink time ...
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The utility model discloses an upstream time slot conflict detecting method in passive optical networks, which comprises the following steps: an optical line terminal OLT detects whether a conflict arises in the upstream time slots of the optical network terminal ONT conflict. The utility model also discloses an optical line terminal, which comprises an optical receiver, an optical transmitter, a control unit, as well as a detection unit. The utility model also provides a detection unit. The utility model can detect conflicts in upstream slot in passive optical networks under circumstances of low system costs.
Description
technical field [0001] The invention relates to passive optical network technology, in particular to an uplink time slot conflict detection method and an optical line terminal in the passive optical network. Background technique [0002] Passive Optical Network (PON) technology is an optical access technology for point-to-multipoint transmission. Refer to the PON system structure shown in Figure 1. The PON system mainly includes Optical Line Terminator (OLT) , Optical Distribution Network (Optical Distribution Network, ODN) and Optical Network Unit (Optical Network Unit, ONU) these three parts. Among them, an OLT can be connected to one or more ODNs; an ODN can be connected to one or more ONUs; the ODN is used to transmit the downlink data of the OLT to each ONU through optical branching, and transmit the uplink data of the ONUs to each ONU through aggregation. OLT. If an ONU can simultaneously provide user port functions such as an Ethernet (Ethernet) user port or a plain...
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IPC IPC(8): H04B10/08H04J14/08
CPCH04J3/1694
Inventor 黄伟赵峻喻凡林薇
Owner HUAWEI TECH CO LTD