Specifications


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
emier,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transmierwhen
the repeateris set tothe BASEmode(the
RE-
PEATER
LEDisturnedo)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.
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
transmier.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.

LINE Jack
Modular Jack Pin Numbering