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270 Chapter 8
C:\Spk\Ref\RefGuideRevE\Enc-dec.fm
Signaling Encoder and Decoder - Screens and Control Fields
Control Fields for the Signaling Encoder and Decoder
Message (FVC) (NAMPS-TACS)
Figure 8-8 NAMPS-NTACS FVC Message Data output Format
This description applies to the NAMP-NTAC mode.
The 7 hexadecimal characters (28 bits) of this FVC message are
combined with 12 parity bits calculated by the encoder to output a
40-character data stream. This information is output when the
Message/DST field is set to Message, and Send is selected.
Operating Considerations
The entire field must contain data, no blank spaces are allowed. DSAT
is turned off while the FVC Message Stream is being sent.
Screens Where Field is Present
SIGNALING ENCODER (Modes: NAMP-NTAC)
Message/DST (FVC)
This field is available only in NAMP-NTAC mode.
This field determines what type of data is sent when Send is selected:
1. Selecting Message causes the contents of the Message field to be
output.
2. Selecting DST causes the digital signaling tone sequence to be
output. The sequence sent is the inverse of the sequence entered in
the DSAT field, and is automatically determined by the Encoder.
The DST values are: DAA934, DAA4D4, DA9564, DA52B2, D954D4,
D94D52, and D69654.
Screens Where Field is Present
SIGNALING ENCODER (Modes: NAMP-NTAC)
Parity
12-bits
Message Info
28--bits
24-bits 24-bits 24-bits 24-bits
DSAT DSAT DSAT DSAT
Sync word
30-bits
Message DSAT
FVC
Data Direction
Send
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