Trunking Control; System Interface - Motorola MSF 5000 Instruction Manual

MSF
5000
Instruction Manual
Chapter 1 Description
Trunking Control
System
Interface
68P81092E02
3/19/94
TTRC
Functional Description
The trunking
control sets
up
a
communications
link
between the
Trunking
Central Controller
and
a
trunked station. The trunking interface connection
incorporates inbound transmit audio, outbound receiver audio, and
digital
control signals. The interface connection originates on
the
TTRC
Logic
board
via
the
Junction
Box of the station. The
Junction
Box
allows
the station to connect to
the
Trunking Central Controller. Refer to the System Interface section for
connector pin-outs.
The Trunking Central Controller determines the state of
a
trunking system by
verifying
the control handshaking between
the
station and Trunking Central
Controller. The handshaking signal from
the
Trunking Central Controller
to a
trunked station is
the
TDATA
signal. The handshaking signal
to the
Trunking
Central Controller from
a
trunked station is
the
TSTAT
signal.
Depending
on the state
of the system, one of three functions
are
performed: voice
channel, control channel, or failsoft. When handshaking between the station and
the
Trunking Central Controller
is functioning properly and station diagnostics
are not
signifying
a
problem,
the voice channel or control channel are available
modes.
If handshaking
is interrupted (broken or bad connection,
malfunctioning
Trunking Central Controller,
etc.), the station enters failsoft mode.
If
the station enters failsoft mode,
a
codeword and an audible
tone are
transmitted
over
the
air from
the
SSCB. This causes the subscriber units to
automatically
revert
to
preassigned failsoft channels and begin conventional repeater operation.
If
the station is in failsoft mode and proper central controller to station
handshaking
resumes, the station resumes normal trunking operation based on
the
Trunking Central
Controller.
The
TTRC
board
allows
the
MSF
5000 to
interface in
a
large number of systems.
The station
interfaces include
a
trunking
connector (J2901),
a
systems connector
(J2900), and
a
wireline
interface.
The connectors and wireline interface
are
externally
accessed
through
the
Junction
Box. Refer
to
Figure
1-10
for connector
pinouts.
1-25
MSF
5000
Instruction Manual
Chapter 1 Description
Trunking Control
System
Interface
68P81092E02
3/19/94
TTRC
Functional Description
The trunking
control sets
up
a
communications
link
between the
Trunking
Central Controller
and
a
trunked station. The trunking interface connection
incorporates inbound transmit audio, outbound receiver audio, and
digital
control signals. The interface connection originates on
the
TTRC
Logic
board
via
the
Junction
Box of the station. The
Junction
Box
allows
the station to connect to
the
Trunking Central Controller. Refer to the System Interface section for
connector pin-outs.
The Trunking Central Controller determines the state of
a
trunking system by
verifying
the control handshaking between
the
station and Trunking Central
Controller. The handshaking signal from
the
Trunking Central Controller
to a
trunked station is
the
TDATA
signal. The handshaking signal
to the
Trunking
Central Controller from
a
trunked station is
the
TSTAT
signal.
Depending
on the state
of the system, one of three functions
are
performed: voice
channel, control channel, or failsoft. When handshaking between the station and
the
Trunking Central Controller
is functioning properly and station diagnostics
are not
signifying
a
problem,
the voice channel or control channel are available
modes.
If handshaking
is interrupted (broken or bad connection,
malfunctioning
Trunking Central Controller,
etc.), the station enters failsoft mode.
If
the station enters failsoft mode,
a
codeword and an audible
tone are
transmitted
over
the
air from
the
SSCB. This causes the subscriber units to
automatically
revert
to
preassigned failsoft channels and begin conventional repeater operation.
If
the station is in failsoft mode and proper central controller to station
handshaking
resumes, the station resumes normal trunking operation based on
the
Trunking Central
Controller.
The
TTRC
board
allows
the
MSF
5000 to
interface in
a
large number of systems.
The station
interfaces include
a
trunking
connector (J2901),
a
systems connector
(J2900), and
a
wireline
interface.
The connectors and wireline interface
are
externally
accessed
through
the
Junction
Box. Refer
to
Figure
1-10
for connector
pinouts.
1-25