Avaya BCM50 Installation Manual download pdf (Page 78)

78 Chapter 6 Checking the installation prerequisites

NN40020-302

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) must 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 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 BCM50 system:

• Digital loop on page 78

• Analog loop on page 78

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-approved Class 2 power source.

In Europe, the SAPS must be a Class II power source and CE marked.

• no bridge taps

Analog loop

You must meet the following parameters for an analog loop:

• maximum DC loop resistance of 208 Ω

• maximum cable length (0.5 mm or 24-AWG) of 1220 m (4000 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 BCM50 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. If these ground connections are

not connected, contact the appropriate electrical inspection authority. Do not try to make

the connections yourself.

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Avaya BCM50 Installation Manual Page 78