This read-write value specifies the connection's Minimum Cell Rate, computed the same way as cesConnPCR when left unset: N times 64 Kbps based on assigned timeslots for CESM-8T1/E1, or the full T3/E3 line rate for those card types. An administrator generally leaves this unconfigured so it matches the connection's actual timeslot-derived bandwidth requirement, since circuit emulation traffic typically needs guaranteed minimum bandwidth equal to its peak rate. For example, on CESM-T3 the MCR would default to the full 44736 Kbps line rate if left unset, reflecting that a T3 circuit-emulation connection needs its entire nominal bandwidth guaranteed.