A count of the number of times a -Queue-4- frames
reception occurs. A single counter at the ONU and a set
of counters, one for each LLID, at the OLT. Increment
the counter by one for each frame received for each
LLID, which is an output of -Queue-4-. The -Queue-4-
marking matched the REPORT MPCP message Queue-4 field,
as defined in [802.3ah] clause 64.
This counter is mandatory for an ONU and an OLT.