ECC communication overload

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When the network is over-sized and the inter-NE ECC communication scale exceeds the limit for the NE processing capability, the ECC communication load becomes heavy or even the system control board may undergo frequent resets.
First, check the network scale. The network contains at most 100 NEs. When the network contains more than 100 NEs, you must divide the network into ECC subnets and set up DCN management channels for each subnet so that the ECC subnets are relatively independent.
Second, check the NE scale of each single site. When multiple devices are connected using the HUB (or inter-subrack cascading) and they communicate with each other using the extended ECC function of network ports, the maximum number of NEs (the sum of the server and clients) for extended ECC cannot be greater than 8. If the number exceeds 8, the NEs are likely to be reset. When the number is not greater than 4, extended ECC in auto mode or specified mode can be used. When the number is greater than 4 but less than 8, extended ECC in specified mode is recommended.

Other related questions:
Method used to determine whether ECC traffic is too heavy
When the network scale is too large, the ECC communication traffic between NEs might be too heavy for the NE processing capability and cause the SCC boards to reset frequently. First, check the network scale. The number of NEs on the network must be less than 100. If the network scale exceeds the number, subnet the ECC network and set up a DCN management channel for each subnet. Second, check the scale of each site. When multiple devices are connected through a hub (or through subrack cascading) to communicate with each other through the extended ECC function of the network ports, the size of the extended ECC network (the total number of servers and clients) cannot be greater than 8. Otherwise, the NE may be reset. When the number of servers and clients is smaller than or equal to 4, either automatic or manual mode can be used. When the number is greater than 4, the manual mode is recommended.

Whether an OSN 1800 can communicate with an SDH device through the extended ECC
An OSN 1800 can communicate with an SDH device through the extended ECC.

Receiver overload point
The receiver overload point refers to the maximum optical power that can be received.

Method used to configure extended ECC in a slave subrack and method used to connect network cables to achieve extended ECC communication
The NM_ETH port of a slave subrack is disabled by default and is not used for inter-NE communication. Inter-NE communication is implemented only through the NM_ETH port of a master subrack.

Network cable used on the management network port between devices for extended ECC communication
The Metro 2050 is connected to the OSN 1500B through the management network port using a crossover network cable for extended ECC communication, because both are terminal devices and Metro 2050 does not support auto-sensing.

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