Faqs About Operation And Maintenance - Huawei EchoLife HG861 Manual

EchoLife HG861 GPON Terminal
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5.4.2 FAQs About Operation and Maintenance

FAQs about operation and maintenance include operation and maintenance faults that occur on
the HG861, subscribers' doubts, and the corresponding solutions.
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Issue 01 (2009-07-30)
{ sn-auth<K>|password-auth<K> }:sn-auth
{ profile-id<K>|profile-name<K> }:profile-id
{ profile-id-value<U><1,128> }:2
{ <cr>|desc<K> }:
Command:
ont add 0 1 hwhw-11111111 sn-auth profile-id 2
Q: What are functions of setting min-distance and max-distance for a GPON port?
A:
huawei(config-if-gpon-0/12)#port 1 range min-distance 10 max-distance 15
1. Run the preceding command to set the min-distance and max-distance for the ranging
between the OLT and an ONT. The OLT opens windows to receive a ranging response
from the ONT.
2. Max-distance indicates the radius of the concentric circle that is synchronized last.
The OLT can use the max-distance and RTD to calculate EqD and then allocate EqD
to the corresponding ONT.
3. The difference between the values of min-distance and max-distance cannot be larger
than 20 km.
4. If values of min-distance and max-distance are set properly and accurately in
engineering, the delay of the transmission between the ONT and the OLT can be
reduced.
Q: FEC is valid only for the downstream traffic currently, does the upstream traffic support
FEC?
A: Whether the upstream traffic supports FEC is determined by the configuration of the
office. The ONT supports the FEC configurations in the upstream and downstream
directions.
Q: One T-CONT contains multiple GEM ports. When CAR is used for flow control,
priorities of traffic streams in a GEM port are the same. When the actual traffic volume of
all the GEM ports is greater than the bandwidth preset in the T-CONT profile, what is
scheduling mode adopted by the ONT?
A: In this case, the ONT uses the round mode, that is, equal allocation. For example, allocate
30 Mbit/s traffic to the T-CONT profile, 20 Mbit/s traffic to GEM port 1, and 25 Mbit/s
traffic to GEM port 2. In this case, the actual traffic volume is that 15 Mbit/s for GEM port
1 and 15 Mbit/s for GEM port 2.
Q: How does the ONT priority mapping?
A: There are eight priorities for packets, and four queues in the chip. The mapping is shown
as follows:
6, 7 -> 0 High
4, 5 -> 1
2, 3 -> 2
0, 1 -> 3 Low
Q: What are the purpose and method of OLT ranging in the GPON system?
A: The purpose of ranging in the GPON system is to ensure the same time reference for all
ONTs connected to one PON port. In this way, the time division multiplexing (TDM) mode
of the upstream data can be implemented.
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5 Troubleshooting
//Authentication mode
//ONT profile ID
5-13