Signaling Encoder and Decoder - Screens and Control Fields

AMPS-TACS, NAMPS-NTACS Encoder and Decoder

NAMPS-NTACS Reverse Voice Channel Measurements

Three types of RVC information can be decoded; selected using the

Measure field. See Figure 8-3.

Figure 8-3

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. See Figure 8-4 on page 257.

Data displays the 36 message bits and 12 parity bits of the RVC message. The measurement 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. See Figure 8-4 on page 257.

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 system). See Figure 8-4 on page 257.

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Agilent Technologies 8935 series e6380a manual NAMPS-NTACS Reverse Voice Channel Measurements, Measure Field