Current count, from CMTS initialization, of contention request
minislots defined for this upstream logical channel. This count
includes all minislots for IUC1 assigned to a broadcast or multicast
SID on the logical channel.
This is the 64 bit version of docsIfCmtsUpChnlCtrTotalCntnReqMslots,
and will not be accessible to SNMPv1 managers.
Support for this object is optional. If the object is not supported,
A value of zero is returned.