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Chapter 8 269
Signaling Encoder and Decoder - Screens and Control Fields
Control Fields for the Signaling Encoder and Decoder
Message (FVC) (AMPS-TACS)
Figure 8-7 AMPS-TACS FVC Message Data Output Format
This description applies to the AMPS-TACS mode.
The 7 hexadecimal characters of the FVC Message field represent the 2
type bits and 26 information bits in the FVC message word.
The generation of dotting, word sync, parity, and the 11 repetitions of
these parameters in the FVC message stream is done automatically.
Operating Considerations
The entire field must contain data, no blank spaces are allowed. SAT is
turned off while the FVC message stream is being sent.
Screens Where Field is Present
SIGNALING ENCODER (Modes: AMPS-TACS)
Contents of the Message or Field
T
T
2
1
Parity
(2 Bits) (26 Bits) (12 Bits)
Message Word
Information
F V C
Message
.........is output in this sequence
The data you enter here............
DOTTING
W.S.
REPEAT 1
OF
WORD
REPEAT 2
OF
WORD
DOTTING
W.S.
W.S. W.S. W.S.
DOTTING DOTTING
REPEAT 9 REPEAT 10 REPEAT 11
OF OF OF
WORD WORD WORD
101 Bits 11 Bits
40 Bits
37 Bits
40 Bits
11 Bits
11 Bits
40 Bits
11 Bits
37 Bits
40 Bits
37 Bits
40 Bits
DOTTING
11 Bits
37 Bits
W.S.=Word Sync