The ieee802.3av standard defines 10g/1g (uplink rate 10g/downlink rate 1g) asymmetric physical layer mode (hereinafter referred to as 10g/1g asymmetric mode) and 10g/10g (uplink rate and downlink rate are both 10g) symmetrical two A physical layer (hereinafter referred to as 10g/10g symmetric mode) mode:
The olt in 10g/1g non-pair mode can be compatible with onu in 1g/1g symmetric mode and onu in 10g/1g asymmetric mode. OLT in 10g/10g symmetric mode can be compatible with onu in 1g/1g mode, onu in 10g/1g asymmetric mode, and onu in 10g/10g symmetric mode.
The OLT in symmetric mode and the OLT in asymmetric mode are the same in the downlink direction of the optical path of the physical layer, and the 10g channel uses 1577nm wavelength and 64b/66b code encoding; so no matter whether the onu is in symmetric mode or asymmetric mode, it can Receive downlink data from olt. The olt will periodically broadcast the mpcpdsicoverygate (multi-point control protocol, multi-point control protocol) frame. The discovery information field in the frame is specially used to notify the uplink window capability (1g, 10g, 1g+10g dual rate), and the onu can obtain the olt through this frame current working mode.
The onu in symmetric mode and asymmetric mode is completely consistent at the mac layer (media access control, medium access control layer), and the difference between them is concentrated in the phy layer (physical layer, the bottom layer of osi), and the sending parameters of the phy layer depend on Insert the optical module of onu:
When an asymmetric optical module is inserted into the onu (that is, the onu is an asymmetric onu), since the uplink rate of the asymmetric optical module is up to 1g, the phy layer of the onu can only configure the transmission rate of 1g to work in asymmetric mode . When a symmetrical optical module is inserted into the onu, since the uplink rate of the optical module is up to 10g, the onu can either configure the sending rate of the phy layer to 10g to work in symmetric mode, or configure the sending rate of the phy layer to 1g to work in asymmetric mode.
However, the existing onu and olt will have the following defects when the network is upgraded:
During network upgrade, OLT may switch between symmetric mode and asymmetric mode, but ONU cannot switch according to the conversion of OLT. For example, OLT switches from symmetric mode to asymmetric mode, but ONU is still in symmetric mode. At this time, the local end (olt) and the remote end (onu) modes do not match.Technical realization elements:
Aiming at the defects existing in the prior art, the technical problem solved by the present invention is: how to make the onu adaptively transform according to the conversion mode of the olt when the olt performs the conversion of the symmetric mode/asymmetric mode; the present invention realizes the perfect combination of the olt and the onu Adaptation, there will be no mismatch between the local end mode and the remote end mode.
In order to achieve the above purpose, the onu provided by the present invention adapts to 10g/10g symmetry and 10g/1g asymmetry, including the following steps:
Step a: Obtain the type of optical module of onu. When the optical module is a symmetrical optical module, determine the current working mode of onu. If the working mode of onu is symmetrical mode, go to step b; if the working mode of onu is asymmetrical mode , go to step c;
Step b: Determine whether the number of window information issued by the olt in the asymmetric mode is above the specified threshold, if so, switch the working mode of the onu from the symmetrical mode to the asymmetrical mode, and end; otherwise, keep the working mode of the onu, and end;
Step c: Determine whether the number of window information issued by the olt in symmetric mode is above the specified threshold, if so, switch the working mode of onu from asymmetric mode to symmetric mode, and end; otherwise, keep the working mode of onu, end.
On the basis of the above technical solution, the process of obtaining the type of the optical module of the onu described in step a is: when the onu starts, obtain the type of the optical module of the onu:
If the optical module is an asymmetric optical module, terminate the process and end;
If the optical module is a symmetrical optical module, when the onu changes from the no-light state to the relevant state, reacquire the type of the optical module of the onu, if the optical module is a symmetrical optical module, continue the subsequent process of step a; if the optical module is asymmetrical Optical module, terminate the process and end.
The onu provided by the present invention adapts to 10g/10g symmetrical and 10g/1g asymmetrical systems, including an onu detection module, a symmetrical mode switching module, and an asymmetrical mode switching module arranged on the onu;
The onu detection module is used to: obtain the type of the optical module of the onu, when the optical module is a symmetrical optical module, determine the current working mode of the onu, if the working mode of the onu is a symmetrical mode, send a symmetrical mode switching signal to the symmetrical mode switching module; If the working mode of the onu is an asymmetric mode, an asymmetric mode switching signal is sent to the asymmetric mode switching module;
The symmetric mode switching module is used to: after receiving the symmetric mode switching signal, judge whether the number of window information issued by the olt in the asymmetric mode reaches a specified threshold or not, and if so, switch the working mode of the onu from the symmetric mode to the asymmetric mode; Otherwise keep the working mode of onu;
The asymmetric mode switching module is used to: after receiving the asymmetric mode switching signal, judge whether the number of window information sent by the olt to the symmetric mode is above the specified threshold, and if so, switch the working mode of the onu from the asymmetric mode to the symmetric mode ; Otherwise keep onu working mode.
On the basis of the above-mentioned technical scheme, the process of obtaining the type of the optical module of the onu in the onu detection module is: when the onu starts, obtain the type of the optical module of the onu:
If the optical module is an asymmetric optical module, stop working;
If the optical module is a symmetrical optical module, when the onu changes from the no-light state to the related state, reacquire the type of the optical module of the onu, if the optical module is a symmetrical optical module, continue the subsequent process of the onu detection module; if the optical module is a non- Symmetrical optical module, stop working.
Compared with the prior art, the present invention has the advantages of:
(1) Referring to step a of the present invention, it can be known that the present invention has first accurately obtained the type of onu; on this basis, referring to step b and step c of the present invention, it can be seen that the present invention can detect the operating mode of the olt, and according to the operating mode of the olt , to adapt to adjust the working mode of the onu, so as to realize the perfect adaptation between the olt and the onu, and there will be no mismatch between the local end mode and the remote end mode in the prior art.
(2) Referring to step a of the present invention, it can be seen that if the present invention determines that the type of onu is an asymmetric onu, that is, the onu only has the ability to work in an asymmetric mode, and the onu can only adapt to the 10g/10g symmetric mode, and the follow-up is not carried out at this time process (because onu cannot switch working modes), thereby reducing operating costs and improving work efficiency.
(3) Referring to step a of the present invention, it can be seen that the present invention needs to detect the type of the optical module of the onu when the onu is started and when the onu changes from a dark state to a light state, and the above-mentioned 2 detections can detect the initial state of the onu The type of optical module (detection at startup), and whether the optical module has been changed (detection when changing from a no-light state to a light state); therefore, the present invention can accurately switch subsequent working modes according to the type of onu’s optical module , so as to ensure the accuracy of the work.
Post time: Jun-05-2023