Installation
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Page
3-26
Lightning Protection
Lightning Protection
7.9 For additional lightning protection, install gas discharge tubes with silicon avalanche
suppressors to ground (grounding rod or copper, cold water pipe) on each CO, DID, and OPX
trunk. This must be done external to the system. Each gas discharge tube is installed directly
between the telephone company [network provider] RJ-type block and the system’s CO/DID/
OPX input. This protection should provide energy absorption and filter low-level surge poten-
tials.
7.10 Also, in areas with frequent occurrences of lightning, the cable between the telephone
company [network provider] RJ-type blocks and the gas discharge tubes must be at least 75
feet (22.5 meters) long (the cable may be coiled up if desired).
Figure 3-8. Example of Ferrite Bead Installation
AMPHENOL-TYPE
CONNECTORS
25-PAIR CABLES
TO THE MDF
FERRITE
BEADS
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