Description 1
The first byte is the new mapping to set. The second byte is the mask for the setting. For example to split the second ODU1 of Uplink 1 into two ODU0 First byte should be - 01000000 Second byte should be - 01000000 To change the reunite the third ODU1 of uplink 2 First byte should be - 00000000 Second byte should be - 00000010
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)