Message/Dst (Fvc); P - HP 8921A User Manual

Chapter 10, Signaling Encoder (AF Generator 2)
AMPS-TACS NAMPS-NTACS Encoder

Message/DST (FVC)

Polarity
310
This field is available only in NAMP-NTAC mode.
This field determines what type of data is sent when
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 de-
termined by the Encoder.
The DST values are: DAA934, DAA4D4, DA9564, DA52B2, D954D4, D94D52, and
D69654.
This setting determines the relationship between the signaling logic levels and the
effect on the modulated signal.
Normal Operation. When this field is set to
output level of the AF Generator to be more positive. The peak level is listed in
the field. A logical low (0) causes the level to become negative by
Data Level
the same amount.
Inverted Operation. When this field is set to
the output level of the AF Generator to be more negative. The peak level is listed
in the field. A logical low (0) causes the level to become positive by
Data Level
the same amount.
is selected:
Send
, a logical high (1) causes the
Norm
, a logical high (1) causes
Invert