Nortel Networks BCM50 manual System equipment, supplies, and tools, Analog loop, Basic hardware

Chapter 6 Checking the installation prerequisites 77

Analog loop

The following parameters must be met 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.)

System equipment, supplies, and tools

Refer to the following sections for the equipment required to install the BCM50 system:

•“Basic hardware”

•“Optional equipment”

•“Other hardware and tools” on page 78

Basic hardware

The BCM50 system consists of some combination of the following hardware:

•main unit: BCM50, BCM50a, or BCM50e

•expansion unit

•media bay module (MBM)

•telephones

•cabling for connections between hardware units

You can connect a maximum of two expansion units to a BCM50 system. Each expansion unit can contain one MBM.

Note: You require keycodes for some hardware to function.

Optional equipment

You can add the following equipment to the BCM50 system to support specific requirements beyond the basic hardware:

•station auxiliary power supply (SAPS)

•key indicator module (KIM) for T7316E telephones

•analog terminal adapter 2 (ATA2) if connecting analog equipment to a digital extension line

•uninterruptable power supply (UPS)

•USB hub (required if the system uses a UPS)

BCM50 Installation and Maintenance Guide