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Nortel Norstar 6-Port Copper Expansion Cartridge NT5B27

 Six-port Cooper Expansion Cartridge.

The Six-port expansion cartridge allows any combination of modules (TM and/or SM), to a maximum of six, to be connected to the system. These Modules are connected to the expansion cartridge by Copper DS-30 cables plugged into the ports on the face of this cartridge.