Telos Zephyr Xstream User Manual page 72

It is essential that the third "grounding" pin not be defeated on the power cord and that the
power cord be connected to a properly grounded receptacle. If a grounded receptacle is not
available, a qualified electrical contractor, familiar with the regulations in your area, should be
contracted to provide one.
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IMPORTANT!
As with any piece of modern electronic gear, it is advisable that precautions be taken to
prevent damage caused by power surges. Standard line surge protectors can be used to
offer some degree of protection. It is the user's responsibility to ensure protection
adequate for their conditions is provided (see above).
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WARNING!
This equipment is designed to be operated from a power source that includes a third
"grounding" connection in addition to the power leads.
Do not defeat this safety feature. In addition to creating a potentially hazardous situation,
defeating this safety ground will prevent the internal line noise filter from functioning.
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IMPORTANT SAFETY INFORMATION!
If fuse replacement is required, please note: For continued protection
against fire, replace fuse only with same type and value. See the DETAILED
TECHNICAL INFORMATION section for information and cautions.
ISDN Lightning Protection
The single biggest source of failures of Telecom equipment is due to damage related to
lightning. Some failures are catastrophic failures, while some are due to the cumulative damage
that can occur over the course of several years. For this reason, we also recommend that in
addition to AC (mains) power protection (see above), that a quality telephone line s‐stage surge
protector be employed at the back panel of the Zephyr Xstream. The ground terminal of this
device should be connected directly to the Zephyr Xstream chassis, and the protector connected
to the Xstream's ISDN Interface jack with as short a cable as possible (under 8 inches). This
approach is particularly well suited to situations where you expect nearby strikes, such as when
you are located near a tower.
USER'S MANUAL
Section 4: BASIC OPERATION & INSTALLATION 60
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