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MSF
5000
Instruction Manual
Chapter
1
Description
TTRC
Audio Board
TTRC
Audio Board
Functions
of
TTRC
Audio Board
The
major functions of the
TTRC
Audio
board include:
Transmit
Audio
TRC
Decode
Audio
DC
Remote Current Detection
Receive
Audio
o
Trunking Modulation
and Receive
Audio
Simulcast Modulation
Audio
Each
is described in the
following
paragraphs.
Transmit Audio
The transmit audio section transfers wireline audio originating
at
a
console or
other remote device
to the
SSCB
for transmission.
Figure
1-11
shows
a
block
diagram of
the
transmit audio circuitry.
NOTE
Secure operation is not compatible
in
900
MHz
Analog
Plus stations.
The transmit audio
is
input
to the
SSCB though two
paths. Path
1
is
RAW TX
AUDIO
sent to the Secure board
via
the
SSCB
for transparent coded transmissions.
Path
2
is
TX
AUDIO
for clear transmissions.
If
the Secure
board is installed,
TX
AUDIO
is also routed
to
it
via
the
SSCB
for transparent encrypted coded
transmissions. Transmit audio is input
to the
station
via
a
wireline
interface.
Wireline Interface
The wireline
interface
network
connects the
TTRC
board
to
external wirelines.
The wireline
is
connected to the station
via
the
Junction
Box.
Two six-conductor
telco cables
provide
the connection
between
the
Junction Box
and
TTRC
board.
Jumpers must
be
correctly
set
for proper operation of the station. Refer
to
Table
1-7.
68P81092E02
3/19/94
1-27
MSF
5000
Instruction Manual
Chapter
1
Description
TTRC
Audio Board
TTRC
Audio Board
Functions
of
TTRC
Audio Board
The
major functions of the
TTRC
Audio
board include:
Transmit
Audio
TRC
Decode
Audio
DC
Remote Current Detection
Receive
Audio
o
Trunking Modulation
and Receive
Audio
Simulcast Modulation
Audio
Each
is described in the
following
paragraphs.
Transmit Audio
The transmit audio section transfers wireline audio originating
at
a
console or
other remote device
to the
SSCB
for transmission.
Figure
1-11
shows
a
block
diagram of
the
transmit audio circuitry.
NOTE
Secure operation is not compatible
in
900
MHz
Analog
Plus stations.
The transmit audio
is
input
to the
SSCB though two
paths. Path
1
is
RAW TX
AUDIO
sent to the Secure board
via
the
SSCB
for transparent coded transmissions.
Path
2
is
TX
AUDIO
for clear transmissions.
If
the Secure
board is installed,
TX
AUDIO
is also routed
to
it
via
the
SSCB
for transparent encrypted coded
transmissions. Transmit audio is input
to the
station
via
a
wireline
interface.
Wireline Interface
The wireline
interface
network
connects the
TTRC
board
to
external wirelines.
The wireline
is
connected to the station
via
the
Junction
Box.
Two six-conductor
telco cables
provide
the connection
between
the
Junction Box
and
TTRC
board.
Jumpers must
be
correctly
set
for proper operation of the station. Refer
to
Table
1-7.
68P81092E02
3/19/94
1-27
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