This read-write integer from 0 to 22222, defined in thousands of bits per second, sets the maximum output payload bandwidth allowed on this OC-3 port, with the Common Controller enforcing that the combined total of all OC-3 and Ethernet port maximums does not exceed the overall system limit. It lets an administrator cap how much traffic the optical trunk can carry downstream. For example, an operator provisioning a new set of VLANs onto this OC-3 uplink would raise this value while confirming the aggregate with existing Ethernet port allocations still stays within system limits.