Current count, from CMTS initialization, of contention initial
maintenance minislots utilized on this upstream logical channel.
This includes all contention minislots for IUC3 applicable to bursts
that the CMTS correctly received.
This is the 32 bit version of
docsIfCmtsUpChnlCtrExtUsedCntnInitMaintMslots,
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.