VXR-5000 Line Interface Port
The VXR-5000 is
provided
with
an
8-pin
modular
jack for line interfacing applications.
A Western Electric
modular-type
RJ45
plug
should
be
used
to connect to
the
jack. The
LINE jack provides -10 dBm line-level
audio
for two uses:
• Provides
an
impedance-balanced, 4-wire
audio
port
with
E+ M auxilliary signalling.
• Provides
audio
for SINAD
meter
connec-
tion
during
alignment
procedures
(see
diagram
on
page
4-1).
LINE jack
pin-out
is
shown
below.
Note
that
there
are
both
4-line
and
8-line
types of
modular
plugs.
If
a 4-pin
modular
plug
is
used,
only
the
LINE
OUT
and
LINE
IN
connections will
be
made.
An
8-pin
plug
is
required
to
access all lines.
In
accordance
with
standard
telecommunications interfac-
ing, the line connections
on
the
LINE interface
jack are
impedance
balanced,
and
are de-
scribed as follows:
Pins 1 &
2.
RX
SQ+,
RX
SQ-
An
opto-isolator is
provided
to facilitate E
signaling (EAR). The opto-isolator comes
on
when
a signal exceeding
the
receiver
squelch
appears
on
the
receiver channel
(with correct CTCSS tone, if enabled). The
RX
Sa-
pin
is
the
emitter,
and
RX
SQ+ is
the collector.
VXR-5000
Pins 3 & 4.
LINE
IN
Tx
Line
Audio
Analog signals
between
300
and
3000
Hz
supplied
to this
pair
are
fed
to
the
trans-
mitter
when
the
repeater
is
set
to
the
BASE
mode
(ACC connector,
pin
13
grounded)
and
keyed either
by
the
TX
KEY
input
signal (see below),
or
by
the
PTT signal
on
pin
12 of
the
ACC jack. Full
system
devia-
tion is obtained
with
a line level of -10
dBm.
Pins 5 &
6.
LINE
OUT
Rx
Line
Audio
Receiver
audio
is available
from
this pair,
subject
to
internal CTCSS
decode
if
the
received
signal
strength
is
above
the
squelch threshold. Receiver
audio
can
be
monitored
by
activating
the
NSQ OFF sig-
nal
on
pin
10
of
the
ACC jack.
As
shipped
from
the
factory, a
I-kHz
re-
ceiver signal
with
full
system
deviation
gives
-10
dBm
on
the
line,
but
this
can
be
varied over
the
range
-55
dBm
to
+10 dBm
by
VR2006
and
S2004
on
the
repeater
CNTL-2 Unit.
Pins 7 &
8.
TX
KEY+,
TX
KEY-
An
opto-isolator is
provided
to
facilitate M
signalling
(MIC).
That
is, a
voltage
pre-
sented
to
these
pins
turns
on
the
opto-iso-
lator
and
keys
the
transmitter.
The
TX
KEY
+
pin
is
the
anode
of
the
opto-isolator
and
TX
KEY-is
the
cathode.
Socket J8201
Instruction
Manual
1 Rx
Sal
+
2 Rx
SQl-
.3 Line
IN
4 " "
5 Line
OUT
6 " "
7 Tx Key +
8 Tx
Key-
LINE jack pin-out
1-15
To Next Page
Loading...