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FAQ-How to Implement the QoS Scheduling for the EPON Service of the MA5680T V800R105

Publication Date:  2012-07-25 Views:  38 Downloads:  0
Issue Description
Q:
How to implement the QoS scheduling for the EPON service of the MA5680T V800R105? 
 
Alarm Information
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Handling Process
A:
When the EPON board works with the control board (SCUL board), the control board is connected to the EPON board through the 10GE bus. The EPON board provides four EPON ports with the symmetric upstream and downstream rates of 1.25 Gbit/s. Each EPON port maps a GE port of the LSW chip of the EPON board.
In the upstream direction, the packets are transmitted from the EPON port to the LSW chip of the control board through the LSW chip of the EPON board, and no congestion occurs. In this case, the queue scheduling in the upstream direction is for the outbound direction of the LSW chip of the control board. That is, queue scheduling functions on the port of the control board. Therefore, the queue scheduling in the upstream direction is not considered in the EPON feature.
In the downstream direction, the queue scheduling may function on the packets transmission from the LAN switch of the control board to the LAN switch of the EPON board, from the LAN switch of the EPON board to the EPON board chip, and on the EPON port, and then the LSW chip of the ONT. On the EPON port, for a single ONT, the downstream rate is about 990 Mbit/s; for the multiple ONTs, the total downstream rate is decreased to 950 Mbit/s because of the protocol cost. In this case, slight congestion occurs.
Flowchart:
LSW of the control board-----LSW of the EPBA board-----PON-----LSW of the ONT
1. The LAN switch of the control board supports eight queues, and supports the PQ and WRR scheduling modes.
2. The LSW chip of the EPON board supports eight queues and the PQ scheduling mode.
3. The PON port supports two queues and the PQ scheduling mode.
4. The ONT supports four queues and the PQ scheduling mode. //The ONTs of different types may be different in supporting the queue scheduling. For details, see the performance description of a specific ONT. 
 
Root Cause
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Suggestions
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