NEC SL1100 BE116510 SL2100 3-PORT CO TRUNK CARDProvides interface for (3) standard loopstart CO trunksEquipped with (1) 8conductor interface jackMust be installed on 082U, 008U, or 000U CardsMax (1) daughter board per 082U, 008U, or 000UMax of (4) can be installed in each Chassis (Main & Exp)Max of (12) can be installed per system*There is no Power Failure Transfer circuitry