The value of tmnxSubMcacPlcyPreRsvdMandBW specifies the bandwidth
pre-reserved for all the mandatory channels on a given subscriber
in kilo-bits per second(kbps).
If the value of tmnxSubMcacPlcyUnconstrainedBW is '0', no mandatory
channels are allowed. If the value of tmnxSubMcacPlcyUnconstrainedBW
is '-1', then all mandatory and optional channels are allowed.
If the value of tmnxSubMcacPlcyPreRsvdMandBW is equal to the value of
tmnxSubMcacPlcyUnconstrainedBW, then all the unconstrained bandwidth
on a given subscriber is allocated to mandatory channels configured
through MCAC policy on that subscriber and no optional
groups (channels) are allowed.
The value of tmnxSubMcacPlcyPreRsvdMandBW should always be less than
or equal to that of tmnxSubMcacPlcyUnconstrainedBW. An attempt to set
the value of tmnxSubMcacPlcyPreRsvdMandBW greater than that of
tmnxSubMcacPlcyUnconstrainedBW will result in inconsistent value error.