Nortel Norstar NT5B26GA-93 2-Port Copper Expansion Card (Refurbished)Key Features: Mfr. Part #: NT5B26GA 93 The Norstar 2 Port Copper expansion card is designed for the Norstar 824 KSU to add expansion modules Connects to the Norstar KSU Will support up to 2 expansion modules which can be used to add either the Norstar 12X0 copper trunk module or the Norstar 0X16 copper station module