NEC SL1100 BE116509 SL2100 TRUNK MOUNTING CARDAllows addition of (1) 3Port CO Trunk Daughter Board (3COIDB) or (1) PRI Daughter Board (1PRDB), when system has fewer station cards than CO Trunk/PRI Daughter BoardsOnly required for system configurations with fewer station cards than CO Trunk/PRI Daughter BoardsInstalls in any universal slot of Main or Expansion Chassis