The value of tmnxMcPathMdaOperChlTimeRemain indicates the time
remaining before the bandwidth update timer for the channel on the MDA
expires. The bandwidth update timer determines how often multicast
bandwidth is updated for a channel. When the value of this field
becomes zero indicating that the bandwidth timer has expired, the
bandwidth of the channel represented by the field
tmnxMcPathOperChlIngLastHighest is updated to the value of the field
tmnxMcPathOperChlIngSecHighest. If the timer is restarted, it indicates
that the current bandwidth of the channel has either stayed the same
or increased since the last poll.