Nortel Networks BCM200/400 - Manual (Page 100)

90 Chapter 5 Checking the installation prerequisites
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Electrical requirements
Ensure you meet the following electrical requirements:
• Power must be supplied from a non-switched, unobstructed outlet within 1.5 m (5 ft.) of the
BCM units.
• The supplied power must be 100/240 V AC, 50/60 Hz, and 10 A minimum service with a
third-wire safety ground. The third-wire safety ground provides shock protection and prevents
electromagnetic interference.
• You can connect the power supply to a power bar. The total length of the power cables from
the power supply to the electrical outlet (including power bar) should not exceed 2 m (6.5 ft.).
You must use a power bar approved by an appropriate National Test Body, with a third-wire
ground. Nortel recommends not to 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
This section describes the requirements for wiring digital telephony devices (digital loop) and
analog telephony devices (analog loop) to the BCM system.
Refer to the following sections for information on the parameters for digital and analog loops:
• “Digital loop”
• “Analog loop” on page 91
Digital loop
The following parameters must be met 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.)
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 BCM power supply and a three-wire power outlet.
Caution: Check ground connections
Ensure that the electrical ground connections of the power utility, telephone lines, and
internal metal water pipe system, if present, are connected together. If these ground
connections are not connected together, contact the appropriate electrical inspection
authority. Do not try to make the connections yourself.