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252 Chapter 8
C:\Spk\Ref\RefGuideRevE\Enc-dec.fm
Signaling Encoder and Decoder - Screens and Control Fields
Signaling Encoder and Decoder Screens
Signaling Encoder and Decoder Screens
The Decoder’s Signal Source
The decoder always gets its signal immediately after the de-emphasis
network of the AF analyzer. De-emphasis can be turned on or off on the
AF ANALYZER screen, or can be controlled while using the decoder by
assigning a global USER key to the De-Emphasis field.
Decoder Frequency Measurements
The decoder uses a different timebase for frequency counting than the
AF Analyzer. Therefore, their measurements may be different when
measuring the same signal (by a very small amount).
The Encoder
The encoder’s uses AF Generator 2 to generate its signals. The
available signaling formats are AMPS-TACS, NAMPS-NTACS, DTMF,
and a function (waveform) generator.