Connecting An E1/T1 Trunk To The G250-Ds1; Step 2: Installing Circuit Protection - Avaya G250 Installing And Upgrading

Connecting an E1/T1 trunk to the G250-DS1

Connect the trunk cable to the E1/T1 port on an MM710 media module. The SIG LED lights.

Step 2: Installing circuit protection

Out-of-building installations of telephones or other standard (tip/ring) devices/terminals that
connect to the Avaya G250 Media Gateway 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 interfaces from over-voltages and sneak current protection:
Avaya MM340 T1/E1 media module: Over-voltage and sneak current protection for these
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interfaces are provided on the media module itself.
Avaya MM342 USP media module: This media module provides an in-building-only
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interface. No over-voltage or sneak current protection is required.
Avaya G250 analog trunk ports have internal fusing, therefore no external sneak current
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protection is required. Analog 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
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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)
Avaya G250-BRI: The two ISDN-BRI ports on the front panel require an NT-1 when
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connecting to an ISDN-BRI trunk.
Step 2: Installing circuit protection
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