Current count, from CMTS initialization, of contention initial
maintenance minislots defined for this upstream logical channel.
This includes all minislots for IUC3 assigned to a broadcast or
multicast SID on the logical channel.
This is the 32 bit version of
docsIfCmtsUpChnlCtrExtTotalCntnInitMaintMslots,
and is included for back compatibility with SNMPv1 managers.
Support for this object is optional. If the object is not supported,
A value of zero is returned.