Method for establishing communication between gigabit-capable passive optical network (GPON) optical line terminal (OLT) and GPON optical network unit (ONU)
A technology for communication establishment and burst data, which is applied in the direction of selection devices, electrical components, selection devices, etc. Effect of reducing hardware circuit cost and design labor cost
Active Publication Date: 2014-07-30
CIG SHANGHAI CO LTD
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[0005] The technical problem to be solved by the present invention is to overcome the defect of high hardware cost caused by the demand of real-time distance measurement in the prior art, and provide a communication establishment method between GPONOLT and GPON ONU that completely utilizes software means to perform the distance measurement process
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[0016] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.
[0017] Because in many GPON application fields, the fiber distance and delay between GPON OLT and GPON ONU are not often changed, and the fiber length between GPON OLT and multiple GPON ONUs is basically the same, and the error is small. Considering the above factors, in the prior art, the GPONOLT searching for the upstream optical signal of the GPON ONU in real time in a wide range will obviously cause a great waste of hardware resources. It is well known that in the design of GPON OLT and GPON ONU, a theoretically more accurate EqD can be obtained in advance, so the present invention will fully utilize software means in a small range on the basis of knowing the value of the theoretical EqD (that is, within the frame length range of each frame), search for the actual position of the ups...
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The invention discloses a method for establishing communication between a gigabit-capable passive optical network (GPON) optical line terminal (OLT) and a GPON optical network unit (ONU). The method comprises the following steps that: 1, the GPON OLT transmits an equalization delay (EqD) to the GPON ONU in a state of not searching burst data of the GPON ONU, and the GPON ONU deviates the position of the burst data at EqD; 2, the GPON OLT transmits a same bandwidth mapping (BWMap) in each frame; 3, a pointer ptr for searching the burst data of the GPON ONU is set in the GPON OLT, and a distance between the position of the ptr and the head of each frame is set to be offset; and 4, the value of the offset is added with one from zero until the GPON OLT searches the burst data of the GPON ONU. By adopting a software measure, an actual position of uplink burst data of the GPON ONU is searched out; therefore, the hardware circuit cost and the design manpower cost are reduced.
Description
technical field [0001] The present invention relates to a kind of GPON (Gigabit-capable Passive Optical Networks, gigabit passive optical network) OLT (Optical Line Terminal, optical line terminal) design method, particularly relate to a kind of GPON OLT and GPON ONU (Optical Network Unit, optical Communication establishment method between network elements). Background technique [0002] In the design of GPON OLT, in order to enable GPON OLT to establish communication with multiple GPON ONUs, it is necessary to use ranging. The purpose of the ranging process is to obtain the RTD (Round Trip Delay) between each GPON ONU and GPON OLT. , round-trip delay), so as to specify the equalization delay parameter EqD (Equalization Delay), so that multiple GPON ONUs can send uplink burst (burst) data to the GPON OLT without interfering with each other, and finally realize the communication between the GPONOLT and the GPON ONU Normal communication. [0003] In common applications, GPON...
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IPC IPC(8): H04Q11/00
Inventor 李志宏赵海波
Owner CIG SHANGHAI CO LTD