This value determines the how this port affects redundancy decisions. Only unused(1) and downlink(4) are allowed on a set. Switch Module ports may return networkInterface(2) or uplink(3), when that port is selected as the ethernet default interface for the system. Unused (1) - this port is ignored in redundancy decisions. Network Interface (2) - Indicates that this port is connected to an upstream router or other non-TA5000 networking equipment. Uplink (3) - Indicates that this port is connected to an upstream TA5000 Node. Downlink (4) - Indicates that this port is connected to a downstream TA5000 Node. erps (5) - Indicates that this port participates in an ERPS ring, and thus supports ERPS timing, but is ignored for redundancy decisions. This value is read only and cannot be set. subtendedHost (6) - Indicates that this port has a subtended host. This value is read only and cannot be set. uni (7) - Indicates that this port is being used as a UNI port and cannot be used for any other services such as EVC MEN connections, network, uplink, downlink, erps, or subtended host. This value is read only and cannot be set.