Line.interface.port - Vertex Standard VXR-7000 Operating Manual

LINE Interface Port
The VXR-7000 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 this jack. The LINE jack pin-out is shown
below.
Note that there are both 4-line and 8-line types of
modular plugs. If a 4-line modular plug is used,
only the LINE OUT and LINE IN connections will be
made. An 8-line plug is required to access all lines.
In accordance with standard telecommunications
interface, the line connections on the LINE interface
jack are impedance balanced, and are described as
follows.
Pins 1 & 2: [ RX SQ ( + ) , RX SQ (–)]
An opto-isolator is provided to facilitate E (EAR)
signaling. The opto-isolator comes on when a
signal exceeding the receiver squelch appears on
the receiver channel (with correct CTCSS tone or
DCS code, if enabled). The RX SQ(‒) pin is the
emitter, and RX SQ(+) is the collector.
Maximum Voltage: 20 V, Maximum Current: 7
mA.
Pins 3 & 4: [ LINE IN ( Tx Line Audio )]
Analog signals between 300 and 3000 Hz sup-
plied to this pair are fed to the transmitter when
the repeater is set to the BASE mode (the RE-
PEATER LED is turned off) and keyed either by
the TX KEY input signal (see below), or by the
EXT PTT signal on pin 12 of the rear panel's ACC
jack. Standard deviation is obtained with a line
level of ‒10 dBm.
6
Pins 5 & 6: [ LINE OUT ( Rx Line Audio )]
Receiver audio is available from this pair, subject
to internal CTCSS or DCS decode if the received
signal strength is above the squelch threshold.
As shipped from the factory, a 1-kHz receiver sig-
nal with standard deviation gives ‒10 dBm on the
line, but this can be varied by VR4002 and S4001
(on the repeater's CNTL Unit).
Pins 7 & 8 [ TX KEY ( + ) , TX KEY (‒)]
An opto-isolator is provided to facilitate M (MIC)
signaling. That is, a voltage presented to these
pins turns on the opto-isolator and keys the
transmitter. The TX KEY(+) pin is the anode of the
opto-isolator, and RX SQ(‒) is the cathode of the
opto-isolator.
Maximum Voltage: 20 V, Maximum Current: 4
mA.
Modular Jack Pin Numbering
VXR-7000 FM Repeater Operating Manual
LINE Jack