Nortel Norstar NT7B69AAAC 4x0 LS/DS Trunk Cartridge (Refurbished)Key Features: Mnfr. Part #: NT7B69AAAC Provides access for up to 4 Central Office analog lines All LS (Loop Start) DS (Disconnect Supervision) trunk cartridges have Disconnect Supervision and are labeled with "DS" on the faceplate This card DOES NOT utilize Caller ID Compatibility: MICS core, MICS 12x0 Fiber and Copper Trunk Modules, the CICS core, and the Modular 8x24 Copper Trunk Module