Site Telephony Wiring Requirements - Nortel Business Communications Manager 450 Installation Manual

104 Preinstallation reference
• Power must be supplied from a nonswitched, unobstructed outlet within
1.5 m (5 ft.) of the BCM450 units.
• If you use a power bar, the total length of the power cables from the power
supply to the electrical outlet (including power bar) must not exceed 2 m
(6.5 ft.).
• The supplied power must be a dedicated 110 V to 120 V AC nominal (or
220 V to 240 V AC nominal), 50 to 60 Hz, 15 A minimum service with a
third-wire safety ground. The third-wire safety ground provides shock
protection and prevents electromagnetic interference.
• If you use a power bar, the power bar must be approved by an appropriate
National Test Body, with a third-wire ground.
• Nortel recommends that you do not use an extension cord between the
power supply and the power bar or between the power bar and the
electrical outlet.

Site telephony wiring requirements

The following sections describe the requirements for wiring digital telephony
devices (digital loop) and analog telephony devices (analog loop) to the
BCM450 system.
Digital loop
You must meet the following parameters for a digital loop:
• one, two, or three twisted-pair cables per telephone
DC loop resistance of less than 64 Ω
•
• cable length (0.5 mm or 24-AWG) less than 300 m (975 ft.)
• use of a station auxiliary power supply (SAPS) for loops 300 m (975 ft.) to
1200 m (3900 ft.). In North America, the SAPS must be a CSA- or UL-
Copyright © 2006-2009 Nortel Networks
DANGER
Risk of electric shock
The safety of this product requires connection to an outlet with a
third-wire ground. Use only with the supplied BCM450 power cord
and a three-wire power outlet.
CAUTION
Check ground connection
Ensure that the electrical ground connections of the power utility,
telephone lines, and internal metal water pipe system, if present, are
connected. If these ground connections are not connected, contact
the appropriate electrical inspection authority. Do not try to make the
connections yourself.
Nortel Business Communications Manager 450 1.0
Installation — System
NN40160-301 01.04 Standard
July 2009