Nortel T1 Service Clock Card NTBB24GA

The Nortel Norstar Service Clock Card is a clock controller card and a T1 recognition card. It provides a master clock signal for systems, and provides DTMF tone recognition for T1 circuits. The Nortel Norstar Service Clock Card is a clock controller card is only compatible with Nortel Norstar Modular ICS telephone systems. It comes with a full one year warranty.