Current count, from CMTS initialization, of contention minislots
defined for this upstream logical channel. This count includes
all minislots assigned to a broadcast or multicast SID on the
logical channel.
This is the 32 bit version of docsIfCmtsUpChnlCtrExtTotalCntnMslots,
and is included for back compatibility with SNMPv1 managers.
Support for this object is mandatory.