Step 2: Installing Circuit Protection - Avaya G450 Installing And Upgrading

Connecting devices

Step 2: Installing circuit protection

Out-of-building installations of telephones or other standard (tip/ring) devices/terminals that
connect to the Avaya G450 Media Gateway Media Modules require over-voltage and sneak
current protection in both buildings. Field installed sneak current protectors must have a
maximum current rating 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:
For the Avaya MM710 or MM340 T1/E1. Over-voltage and sneak current protection for the
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Avaya MM710 and MM340 are provided on the media modules themselves.
For the Avaya MM711, MM714, and MM716 Analog. Over-voltage and sneak current
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protection for these interfaces is provided on the media modules/interfaces. Incoming
trunks normally have over-voltage protection provided by the local telephone company.
Analog voice terminals use one of the following types of combined over-voltage and sneak
current protection at both building entry points:
- Gas tube with heat coil. 4B1E-W
- Solid state with heat coil. 4C1S
- IROB. 146C (4-lines) or 146F (25-lines)
For the Avaya MM712 DCP: either 146E IROB (In-Range Out-of-Building) or 4C3S-75
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solid state protectors for over-voltage and sneak current.
For the Avaya MM722 ISDN-BRI: over-voltage and sneak current protection are provided
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on the media modules themselves.
For the Avaya MM720 ISDN-BRI: network-side applications require an NT-1 device. Tie
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trunk applications require either the 146E IROB (In-Range Out-of-Building) or 4C3S-75
solid state protectors for over-voltage and sneak current.
56 Installation and Upgrades for the Avaya G450 Media Gateway