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Passive optical network backbone optical link protection system and method for realizing fast switching

A passive optical network and protection system technology, which is applied in the field of passive optical network backbone optical link protection system and its realization of fast switching, can solve the problem of affecting optical link ONU service transmission, affecting user service capabilities, and completing before timeout, etc. problem, achieve the effect of shortening intermittent time, maintaining stability, and fast switching

Active Publication Date: 2017-06-20
FENGHUO COMM SCI & TECH CO LTD
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Problems solved by technology

And when there are many online ONUs in the system, these actions may not be completed before the T02 timer expires, so individual ONUs will be disconnected
After the ONU is disconnected, it is necessary to re-discover the ONU to re-register and authorize the entire state transition process, which will seriously affect the service transmission of other ONUs in the optical link, thereby seriously affecting the service ability of users.

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  • Passive optical network backbone optical link protection system and method for realizing fast switching
  • Passive optical network backbone optical link protection system and method for realizing fast switching
  • Passive optical network backbone optical link protection system and method for realizing fast switching

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[0029] In order to facilitate the understanding of the present invention, each formula is described in detail below.

[0030] EqDi=T eqd -RTD i Formula 1)

[0031] see figure 2 As shown, in the passive optical network, the measured equalization delay is calculated by the formula (1), where T eqd is the zero-distance equalization delay, and is the offset value of the uplink frame received by the OLT relative to the corresponding downlink frame. For an optical link with a given fiber distance, T eqd is a fixed value that does not change during its lifetime.

[0032] RTDs i is the loop delay, which includes downlink propagation delay Δolt, ONU response time RspTime i , uplink propagation delay Δonu i It consists of three parts:

[0033] RTDs i =Δolt+RspTime i +Δonu i Formula (2)

[0034] Among them, ONU response time RspTime i It is fixed at 35μs and the deviation is ±1μs.

[0035] Therefore, to measure the equalization delay of the ONU on the optical link, it i...

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Abstract

The invention discloses a PON (passive optical network) backbone optical link protection system and a quick switching method thereof and relates to the technical field of PON. The quick switching method thereof includes that an OLT (optical line terminal)-A sends Lmax-a, Teqd-a and PLO (physical layer overhead) u to an OLT-B; the OLT-B sets Wsize based on the Lmax-a and Lmax-b and acquires an ONU (optical network unit) on-line information table and equalization delay of main optical links of the ONU; as detects that an uplink optical signal occurs to an optical module, the OLT-B acquires bandwidth authorization message from the OLT-A and calculates equalization delay of an ONUi on a standby optical link; the OLT-B calculates equalization delay difference of the ONUi at the standby and the main optical links; the OLT-A updates the ONU on-line information table with the difference and sends the same to the corresponding ONU; once a trigger switching condition is detected, the OLT-B directly performs bandwidth authorization; all the ONUs in the system automatically enter the working condition from the POPUP condition so as to respond to the bandwidth authorization of the OLT-B and send uplink services.

Description

technical field [0001] The invention relates to the technical field of passive optical networks, in particular to a passive optical network backbone optical link protection system and a method for realizing fast switching. Background technique [0002] PON (Passive Optical Network, Passive Optical Network) technology is a broadband optical access technology based on optical fiber. The optical network system consists of OLT (Optical Line Terminal, Optical Line Terminal), ODN (Optical Distribution Network, Optical Distribution Network) and ONU (Optical Distribution Network) Network Unit, optical network unit), because the PON system has many advantages such as high bandwidth, high efficiency, large coverage, and rich user interfaces, most operators use this technology to realize broadband and comprehensive transformation of access network services. Wide layout for great user experience. When the optical link protection is used to provide the reliability of the optical link in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/032H04Q11/00H04J3/06
Inventor 刘静霞
Owner FENGHUO COMM SCI & TECH CO LTD
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