Ttrc Functional Description; Tone Remote Control - Motorola MSF 5000 Instruction Manual

Chapter 1 Description
MSF
5000
Instruction Manual
TTRC
Functional Description
TTRC
Functional Description
Tone Remote Control
The Tone Remote Control
(TRC)
allows control of an
MSF
5000 station from
a
remote location through the use
of
a
non-DC
continuous wireline. The transmit
wireline can
be
configured
as a 2-wire or
a
4-wire
system.
The wireline inputs for
the station are configured
through
the jumper settings on the
TTRC
Audio
board.
Refer to
Appendix G
-
Jumper Settings for jumper information.
Station control is accomplished through a
remote
device that sends
a
High Level
Guard
Tone
(HLGT)
followed by
a
single Function Tone
(FT)
or two
FIs
(positive
mode control).
The
FT(s)
is interpreted
by
the
TTRC
board,
which
initiates the
appropriate station function
via
the
MUXbus, IPCB,
and
HSR.
Figure
1-9
shows
the
typical
TRC
signaling
format. The format shown is
a
relative
relationship between
the
various
tones, actual
levels may vary.
HLGT
=.0,dBm:
T
40 ms
VOICE
20 ms
Avg
Audio dBm
-
Max.'
Beak
Audio
46dBm
HLGT
AMPLITUDE
TIME
Figure
1-9
Typical
TRC
Remote Key-up
The
HLGT
is
sent as a
wake-up signal
to the station.
This
activates the tone
detector
which
alerts the station that
a
FT(s)
will
be
received. The level of
the
HLGT
is approximately equal
to the peak levels of the voice audio on the
wireline.
The
HLGT
is followed
by
a
FT,
a tone that
generally
causes
a
specific action
in
the
station.
For example,
the
FT
may
cause a channel change, mode change, station
key,
etc.
The level of
the
FT
is
10
dB lower than
the
HLGT
level. Refer to Table
1-5
for frequencies and
uses.
During audio
transmission,
a
Low-Level
Guard
Tone (LLGT)
follows
the
FT(s).
The transmitter is kept active until
the
LLGT
is no longer detected. Voice audio is
mixed on top of
LLGT
during
transmission. The
LLGT
frequency is equal to the
HLGT, but is
30
dB lower.
68P81092E02 3/19/94
1-2