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Black Box Corporation
• 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 •
www.blackbox.com
•
e-mail: [email protected]
© 2005. All rights reserved.
Black Box Corporation.
10/15/2003
#20905
Determines the line
status, detecting
dangerous digital
PBXs.
Provides telephone
line surge protection.
Colorful LEDs let you
know when the line is
safe or not.
Corrects reversed
polarity and crossed
wiring.
Tests both the inner
and outer telephone
lines.
No batteries needed.
Noise filter for clearer
transmissions.
A
nalog modems are designed to
connect to analog telephone
lines like those found in most
homes. But most new telephone
systems installed in businesses
and hotels are digital. And
although the jacks for digital
phone lines are identical to
analog jacks, they carry too much
electrical current for modems.
The excess current can damage
the delicate circuits of a modem.
Protect your modem from unsafe
telephone lines with the Modem
Defender.
Use the Modem Defender to
check the phone line for excess
current
before
you connect your
modem.
Protect your modem from damage caused
by excess voltage on digital phone lines.
Key Features
MODEM DEFENDER
A handy LED indicator glows
green when the line is safe. If
there’s too much current on the
line, an LED will light bright red to
alert you not to connect your
modem. When polarity is
reversed, a third yellow LED lights
up. To fix the condition, adjust the
polarity switch on the Modem
Defender and check again.
The Modem Defender works
on virtually any RJ-11 phone line,
including PBX, digital, multi-line,
or single-line. You can also use it
all over the world to test phone
connections.
Plus, the Modem Defender
gives you telephone line surge
protection of up to 1250 amps.
A built-in noise filter provides
quicker and clearer data transfers
and fax transmissions. You can
even use the Modem Defender as
an RJ-11 coupler.
A push of the test button
initiates the line checking. The
unit features two switches. The
first is to change lines since the
Modem Defender can work with
two-line phones. The second is to
change polarity.
