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Chapter 8, Signaling Decoder Screen
Using the AMPS/TACS, NAMPS/NTACS Decoder
NAMPS-NTACS Reverse Voice Channel Measurements
Three types of RVC information can be decoded; selected using the Measure
field.
• DSAT displays the 6-digit DSAT (Digital Supervisory Audio Tone) or DST (Digital
Signaling Tone) number, depending on the type of signal being received. If the received
number is not one of the 14 standard combinations (7 DSAT or 7 DST), the decoder
displays a constantly changing number until one of the standard values is detected.
• Data displays the 36 message bits and 12 parity bits of the RVC message. The mea-
surement begins when the last sync word bit is received, and ends after the last parity
bit is received. The measurement is re-triggered when the next sync word is received:
there is no gate time function for this decoder mode.
• DTMF displays Dual-Tone Multi-Frequency tone pair frequencies and on/off times.
These are tones that may be used to trigger connected equipment after a mobile-to-base
station connection has been made (such as an answering machine or voice-mail sys-
tem).
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