M5317BRI Terminal Page339 of 544
Option11C and 11C Mini TechnicalReference Guide

Electromagnetic emissions

The M5317T telephones are specified to comply with the limits for Class A,
Subpart J of the Federal Communications Commission (FCC), Part 15 and
Class B, CSA C108.8, CISPR22 Class B (AS 3548).

Atmospheric pollution

Each M5317T telephone is designed to withstand normal atmospheric
conditions throughout its life and during shipment. It meets exposure tests for
salt, mist, atmospheric dust, sulfur dioxide and hydrogen sulfide as defined in
IEC document 50.
Terminal powering
Line engineering
The telephones will operate to their full potential through twisted pair wiring.

Powering alternat ives

The telephones are powered through the RJ connectors and the line cord.
They may be powered from one of the following sources:
•PS1, phantom power conducted over the “T” line card or the NT1
•PS2, auxiliary DC power conducted over a third pair in the line cord
(may be provided independently of the NT1 or line card)
•Local DC power conducted over a third pair from a power pack
(connected by means of an RJ-45 plug connector with the DC power
terminated on its pin 7 (PS2-) and pin 8 (PS2+) inserted into one of the
wall-mounted RJ sockets.
A dip switch (switch A), accessible through a small hatch in the base of the
telephone housing, must be set to select between the phantom powering (PS1)
or powering provided by a third pair (PS2 or local AC).