A read-only value identifying the network interface by its Permanent Interface Identifier, shelf, slot, port, and user channel, corresponding to the named entry in this table. This gives an admin the precise physical or logical location behind a given interface name, useful when a name alone isn't enough to physically locate the circuit. When a trouble ticket references only a customer's circuit name, the admin uses cmNamePII to resolve it to the actual shelf, slot, port, and channel to check physically.