Telephones and adjunct systems
384 Installing and Upgrading the Avaya G700 Media Gateway and Avaya S8300 Media Server
Installing over-voltage and sneak-current
circuit protection
Over-voltage and sneak fuse protection measures are necessary for the safe operation of the
G700 Media Gateway system. Out-of-building installations of telephones or other standard (tip/
ring) devices/terminals that connect to the Avaya G700 Media Gateway Media Modules require
over-voltage and sneak current protection at both building entry points. Sneak current
protectors must have a maximum of 350 mA and a minimum voltage rating of 600V.
The following devices have been evaluated or tested and approved to protect the Media
Modules from over-voltages and sneak current protection:
● Avaya MM712 DCP: either 146E IROB (In-Range Out-of-Building) or 4C3S-75 solid state
protectors for surge and sneak current.
● Avaya MM710 T1/E1: over-voltage and sneak protection for the Avaya MM710 T1/E1
Media Module is provided on the Media Module itself.
● Avaya MM711 Analog: analog trunks use the 507B or 110-SCP-9 sneak current protectors.
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:
- Gas tube with heat coil: 4B1E-W
- Solid state with heat coil: 4C1S
- IROB: 146C (4-lines) or 146F (25-lines)
!
WARNING:
WARNING: Only service-trained personnel must install these circuit protection devices.
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