Huawei OSN 3500 Technical Manual page 21

Introduction OptiX OSN 3500 TM - SD
under the situation that a certain node is isolated because of multiple points' failure,
traffic from different segments of the same time slot may contend for the same
protection channel time slot. This brings misconnection of traffic. With extra traffic in
the ring, and even under the situation of a single node's failure, traffic from working
channel may contend for the time slot of protection channel carrying extra traffic. This
also brings misconnection.
To prevent misconnection, every node of the OptiX OSN 3500 has a detailed
connection table. Every node knows the source point and endpoint of each AU-4,
which can tell the potentialities of misconnection in advance with combination of APS
command. Traffic with the potentiality of misconnection is discarded through inserting
AU-AIS.
The OptiX OSN 3500 supports the function of squelching misconnected VC-4 traffic.
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