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The Panasonic DBS VB-43310 is a 24 button expansion unit for series one telephones
2700 provides an interface for a T1
programmable feature buttons
Panasonic DBS VB-43120 Connector TRK Expansion Card (Refurbished) Polycom Private lineKey Features: This unit provides CO line surge protection and a 25 pair male amphenol connector for the CO line card that is installed in the universal slot (EC TRK) of the DBS 40, 72, and 96 port cabinets. Unique design allows for no hassle optically isolated digital I O module expansion Mounts to the top of the cabinet Equipped with a ribbon cable that plugs into connector CN15 on the connector panel of the 40, 72, or 96 port cabinets. The CO line
