Nortel NT7B75GA 4x0 LS/DS Trunk Cartridge (Refurbished)This card (NT7B75GA) is used to add 4 incoming lines to your Norstar Compact ICS or Modular ICS Cabinet. It DOES NOT have Caller ID. Key Features: Mfr. Part#: NT7B75GA Compatible with: CICS, MICS, Modular 8x24 All LS (Loop Start) DS (Disconnect Supervision) Trunk Cartridges have Disconnect Supervision capability and are labeled with "DS" on the faceplate Also called the New DS Loop Start Trunk Cartridge Compatible with the Modular ICS core, Fiber and