Paradyne AT&T 3920 - Manual (Page 3)

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Multipoint Dial Backup Support – Provides the following enhanced PSTN backup capabilities for the
3920Plus and 3921Plus modems:
— Automatic PSTN backup upon loss of APL facility.
— Dial and Ring Tone test for the PSTN facility while operating on APL.
— Testing of the APL facility before restoration to APL and disconnection from PSTN.
— Automatic or manual dial standby.
— Change, Clear, and Display call directory command.
— Subnetwork Health and Status alarms for dial backup.
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Additional VF parameter measurements with corresponding threshold alarms.
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NMS support – 6700 and 6800 Series Network Management Systems support the features described above.