Off-Premises Circuit Protection - Avaya CMC1 Installation Manual

Installing and Cabling the Cabinets
Install Equipment Room Hardware

Off-Premises Circuit Protection

Protection from hazardous voltages and currents is required for all off-premises (out of building) trunks,
lines, and terminal installations. Both over-voltage protection (lightning, power induction, and so forth),
and sneak current protection are required. Sneak current protectors must be either UL listed/CSA
certified, or must comply with local safety standards.
Sneak current protectors must have a maximum rating of 350 mA, and a minimum voltage rating of
600V, or as required by local regulations. The following devices protect the system from over-voltages:
•
Analog trunks use the 507B sneak protector or equivalent. Over-voltage protection is normally
provided by the local telephone company.
•
Analog voice terminals use one of the following types of combined over-voltage and sneak
current protection, or equivalent:
— Carbon block with heat coil for UL code 4B1C
— Gas tube with heat coil for UL code 4B1E-W
— Solid state with heat coil for UL code 4C1S
•
DCP and ISDN-BRI terminals use the solid state 4C3S-75 with heat coil protector, or equivalent
•
DS1/E1/T1 circuits require isolation from exposed facilities. This isolation may be provided by a
CSU (T1), LIU (E1), or other equipment that provides equivalent protection
56 Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
June 2004