IT-REFERENCE 20 OWNER’S MANUAL
voltage, so there are no parts to fi x or replace
after a transient voltage surge incident. It
should be noted, however, that there is no
continuous over-under voltage circuitry or
regulation within the design. For the IT-
Reference 20’s intended user, these features
are typically not necessary. If your specifi c
application requires AC regulation, over-under
voltage power shut-down, or sequenced power
distribution, there is a full line of Furman
products to meet these requirements.
Telco – Satellite – Cable Transient Voltage
Surge Suppressors
The IT- Reference 20 features transient voltage
surge suppression for both standard telephone
lines, as well as cable or satellite lines utilizing
standard coaxial connectors. As these surge
suppressors are in-line, they will require an
additional cable to connect from their output to
the control device requiring protection.
All in-line surge suppressors feature
our exclusive ground contamination free
technology. This aids in eliminating audio
buzzing, and the video hum-bars that can
result from typical in-line suppressors. Further,
our cable and satellite suppressors are TIVO
friendly as well as HD-Digital Television
ready. Both DC carrier signals as well as high
bandwidth signals can pass through our circuit.
In fact the bandwidth is less than 0.1dB loss at
1GHz!
To connect your cabling to these in-line
protectors, simply follow the in and out
indications marked next to the Telco, Cable
and Satellite connectors.
Note: It is not possible to make an in-line cable
or satellite protector “virtually maintenance-
free” as we have accomplished with the 120
VAC line. This would necessitate limited
signal bandwidth that would not allow the
signal to pass. Under extreme conditions, it
is possible that the surge suppression in one
of these devices could sacrifi ce itself after a
catastrophic event. If the telephone, cable
or satellite signal will no longer pass through
our protector, please contact your local
service representative, installer or Furman
for servicing. Since these circuits are modular,
replacement may be accomplished in seconds
with a new TVSS module. To test this, simply
disconnect the incoming and out going cable
from the IT-Reference 20. Connect the
incoming connector to the component that
formerly received the out going connector,
thus by-passing the in-line protection. If the
signal is present (but not when used with the
IT-Reference 20) then the protection circuit is
damaged (assuming it worked properly before
a storm or catastrophic event).
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