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264 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
Filler (FOCC)
Figure 8-5
Each Filler field contains 7 hexadecimal characters representing the 2
type bits and 26 information bits of the control filler/message word. The
dotting, word sync, and parity bits are generated automatically.
Operating Considerations
The control filler is sent continuously when Send Filler is selected, or
after a control message has been sent using Send. The control message
is stopped whenever Stop Filler, Filler, Channel, Data Rate,
Polarity, or AFGen2 To is selected.
Both filler fields must be full (seven digits) for the forward control
channel information to be structured correctly. Do not leave any blank
spaces.
Screens Where Field is Present
SIGNALING ENCODER (Modes: AMPS-TACS, NAMP-NTAC)
T
1
2
(2 Bits)
T
T
1
2
T
(26 Bits)
Information
Parity
Parity
(12 Bits)
Contents of the Message or Filler Field
WORD B
WORD A
...........is output in this sequence.
10 Bits 11 Bits 40 Bits 40 Bits 40 Bits
DOTTING
WORD
SYNC
REPEAT 1
OF
WORD A
REPEAT 1
OF
WORD B
REPEAT 2
OF
WORD A
REPEAT 1 REPEAT 1 REPEAT 1
WORD B WORD B
OF OF
WORD A
DOTTING
40 Bits40 Bits40 Bits 10 Bits
Busy/Idle Bits
The data you enter here............
FOCC
Stream A
Stream B
MessageMessage
Filler
Filler
OF