This read-create Integer32 (0 to 'ffffff'h) is a bit map of DS0 timeslots used to build a given port, with bit 0 representing DS0-1, and it always reads 0 for the network port since DS0 assignment is not applicable there. An admin cares because this bit map is how an admin defines exactly which DS0 channels are bundled into a user port's bandwidth. For example, a technician provisioning a user port across the first four DS0 timeslots would set the lowest four bits of this bit map to construct that port.