Current count, from CMTS initialization, of contention request
data minislots defined for this upstream logical channel. This count
includes all minislots for IUC2 assigned to a broadcast or multicast
SID on the logical channel.
This is the 64 bit version of docsIfCmtsUpChnlCtrTotalCntnReqDataMslots,
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.