Motorola MSF 5000 Instruction Manual page 54

Chapter 1 Description
MSF
5000
Instruction Manual
SSCB
Functional Description
1-16
Audio Routing
The primary function of
the
audio routing circuitry is to properly distribute audio
signals
to
and from all
sources connected to the
SSCB. Various audio inputs
are
enabled
using jumper settings and RSS
parameters. Refer to
Appendix
G
-
Jumper
Settings for configuring jumpers.
Refer to Figure 1-7 for
a
block diagram of
the audio
routing circuitry. The audio
routing circuitry consists of the audio input signals listed in
Table 1-3
and the
audio output signals listed in Table
14.
Table 1-3
Audio
Input
Signal Description
a
BSS
eTFi
PEO,
aw
ignal:
4
De
puv
20
25
esc
Oe
RX
AUDIO
Audio from receive audio processing
circuitry
TX
AUDIO Audio
from the
TTRC
wireline
IN MRTI AUDIO
t
Audio
from the
MRTI
phone patch
LOCAL AUDIO
t
General purpose audio to/from the expansion boards
(also common
with
MIC AUDIO
signal)
MIC AUDIO Audio
from the local user microphone
ALERT TONE AUDIO
Audio from the alert tone encoder on the SSCB
RX2 AUDIO
t
Processed
audio from the optional 2nd receiver
SECURE RX AUDIO
+
Audio
from the Secure board for speaker/ wireline
SEC
ALERT
TONES
t
Tones from the Secure board
(encode/decode only)
CODED MOD AUDIO
t
Audio from the Secure board to the transmitter
TKG MOD AUDIO
TDATA/Simulcast Trunking
audio from
the
TTRC
to the
transmitter
TX
DATA AUDIO
+
General purpose data from
the
expansion modules
GCC DATA AUDIO
t
1200 or 4800
baud data from
the
optional General Communications
Controller
(GCC)
RAW TX AUDIO
Unfiltered audio from the
TTRC
wireline
PL ENCODE AUDIO
Audio
from the PL/connect
tone encoder on
SSCB
SAM_LN_AUD
t
Encoder output of optional Station Access Module
(SAM)
expansion board
+
This signal is
present
only if
the required optional equipment
is installed.
The RX1 AUDIO,
TX
AUDIO, IN MRTI AUDIO,
LOCAL
AUDIO,
and MIC AUDIO
are
summed together at the first stage of the transmit audio processing circuitry. Each
of these inputs are enabled using audio
gates that respond to various
Push-To-Talk
(PTT)
and squelch conditions. The audio gates are controlled
by
the
logic and control circuitry of the
SSCB. The
RX1
AUDIO signal is only
gated to the
transmit audio processing circuitry
if
the station
is configured
as a repeater.
Each of
these
signals
are also summed together at the
line audio, select audio, and
MRTI
summing circuitry.
68P81092E02
3/19/94
Chapter 1 Description
MSF
5000
Instruction Manual
SSCB
Functional Description
1-16
Audio Routing
The primary function of
the
audio routing circuitry is to properly distribute audio
signals
to
and from all
sources connected to the
SSCB. Various audio inputs
are
enabled
using jumper settings and RSS
parameters. Refer to
Appendix
G
-
Jumper
Settings for configuring jumpers.
Refer to Figure 1-7 for
a
block diagram of
the audio
routing circuitry. The audio
routing circuitry consists of the audio input signals listed in
Table 1-3
and the
audio output signals listed in Table
14.
Table 1-3
Audio
Input
Signal Description
a
BSS
eTFi
PEO,
aw
ignal:
4
De
puv
20
25
esc
Oe
RX
AUDIO
Audio from receive audio processing
circuitry
TX
AUDIO Audio
from the
TTRC
wireline
IN MRTI AUDIO
t
Audio
from the
MRTI
phone patch
LOCAL AUDIO
t
General purpose audio to/from the expansion boards
(also common
with
MIC AUDIO
signal)
MIC AUDIO Audio
from the local user microphone
ALERT TONE AUDIO
Audio from the alert tone encoder on the SSCB
RX2 AUDIO
t
Processed
audio from the optional 2nd receiver
SECURE RX AUDIO
+
Audio
from the Secure board for speaker/ wireline
SEC
ALERT
TONES
t
Tones from the Secure board
(encode/decode only)
CODED MOD AUDIO
t
Audio from the Secure board to the transmitter
TKG MOD AUDIO
TDATA/Simulcast Trunking
audio from
the
TTRC
to the
transmitter
TX
DATA AUDIO
+
General purpose data from
the
expansion modules
GCC DATA AUDIO
t
1200 or 4800
baud data from
the
optional General Communications
Controller
(GCC)
RAW TX AUDIO
Unfiltered audio from the
TTRC
wireline
PL ENCODE AUDIO
Audio
from the PL/connect
tone encoder on
SSCB
SAM_LN_AUD
t
Encoder output of optional Station Access Module
(SAM)
expansion board
+
This signal is
present
only if
the required optional equipment
is installed.
The RX1 AUDIO,
TX
AUDIO, IN MRTI AUDIO,
LOCAL
AUDIO,
and MIC AUDIO
are
summed together at the first stage of the transmit audio processing circuitry. Each
of these inputs are enabled using audio
gates that respond to various
Push-To-Talk
(PTT)
and squelch conditions. The audio gates are controlled
by
the
logic and control circuitry of the
SSCB. The
RX1
AUDIO signal is only
gated to the
transmit audio processing circuitry
if
the station
is configured
as a repeater.
Each of
these
signals
are also summed together at the
line audio, select audio, and
MRTI
summing circuitry.
68P81092E02
3/19/94