The analog direct inward dialing (ADID) MBM provides an interface for four analog public switched telephone network (PSTN) lines.
The ADID MBM supports both pulse and tone dialing as well as disconnect supervision, and direct inward dialing call progress signaling as described in standard TIA-464C.
The ADID MBM uses an RJ-21 connector for trunk connections.
The ADID is available either in four-port (ADID4) or eight-port (ADID8) configurations.
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