All out-of-building trunks, lines, and terminal installations require protection from sneak currents and over-voltages, such as lightning and power line induction. Campus installations (interbuilding cabling) of phones or other standard devices require over-voltage and sneak current protection in both buildings. You must install over-voltage and sneak current protectors in accordance with subsections “Protective Devices” and “Cable and Primary Protector Bonding and Grounding” of NFPA 70: NEC Article 800 , or local safety codes.
Field installed sneak current protectors must have a maximum current rating of 350mA and a minimum voltage rating of 600V.
The following over-voltage and sneak current protection devices are approved for use with G450 Branch Gateway:
Media modules |
Approved over-voltage and sneak current protection devices |
Avaya MM710, MM710B, or MM340 T1/E1 media modules |
Over-voltage and sneak current protection for these interfaces are provided on the media modules themselves. G450 Branch Gateway v4 does not support the MM340 media module. |
Avaya MM711, MM714, MM714B, and MM716 analog media modules |
Over-voltage and sneak current protection for these interfaces is provided on the media modules themselves. Normally, the local phone company provides primary over-voltage protection for incoming trunks. Analog voice terminals require 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 (In-Range Out-of-Building). 146C (4 - lines) or 146H (25 - lines) |
Avaya MM712 and MM717 DCP media modules |
Out-of-building connections require either the 146E IROB or 4C3S-75 solid state protectors for over-voltage and sneak current. |
Avaya MM722 ISDN-BRI media modules |
Over-voltage and sneak current protection are provided on the media modules themselves. |
Avaya MM720 and MM721 ISDN-BRI media modules |
All out-of-building installations on both trunk (network) and line (customer) sides require either the 146E IROB or 4C3S-75 solid state protectors for over-voltage and sneak current. Trunk side applications also require an NT-1 device. |
Warning:
Only service-trained personnel can install these circuit protection devices.
