Avaya IG550, Installing And Configuring

Page: 125 / 196

Issue 2 January 2008 125
Over-voltage and sneak-current protection
Over-voltage and sneak-current protection measures are necessary for the safe operation of
the Avaya TGM550 and TIMs. Out-of-building installations of telephones or other terminal
devices that connect to the Avaya Media Modules require over-voltage and sneak current
protection in both buildings. The following devices have been evaluated or tested and approved
to protect the Media Modules from over-voltages and sneak current protection:
●
Avaya TIM510 T1 / E1 Media Module. Over-voltage and sneak current protection are
provided on the Media Modules themselves.
●
Avaya TGM550, TIM508, TIM514, TIM516, and TIM518 Analog Media Modules:
Over-voltage and sneak current 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 the building entry point:
- Gas tube with heat coil. 4B1E-W
- Solid state with heat coil. 4C1S
- IROB. 146C (4-lines) or 146F (25-lines)
●
Avaya TIM521 ISDN-BRI Media Module: over-voltage and sneak current protection are
provided on the Media Modules. Network-side (PSTN) applications require an NT-1
device. Tie trunk applications and connections to digital terminals require either the 146E
IROB (In-Range Out-of-Building) or 4C3S-75 solid state protectors.
!
WARNING:
WARNING:
Only service-trained personnel are to install these circuit protection devices.
Disconnecting AC power
1. Remove the appliance coupler end of a power cord from the appliance inlet on the power
supply faceplate ( Figure 4 or Figure 5 ).
2. For a J6350 only, repeat Step 1 for the second power supply if it exists.
3. Remove the plug of each cord from the AC power source receptacle.