Additional Details ------------------------------ Product description: Norstar LS/DS FeaturesProvides access for up to 4 Central Office analog linesAll LS (Loop Start)/DS (Disconnect Supervision) trunk cartridges have Disconnect Supervision and are labeled with "DS" on the faceplate... CompatibilityCompatible with the MICS core, MICS 12x0 Fiber and Copper Trunk Modules, the CICS core, and the Modular...