This read-write IpAddress value holds the IP address associated with the Pseudo Wire T1/E1 card. It matters because this card, like the other pseudo-wire cards on this platform, needs its own addressable management interface so it can be configured and polled directly by the network management system. For example, a technician bringing a new Pseudo Wire T1/E1 card into service would assign it a management address through this OID before the NMS can reach it for further configuration.