Nortel Networks BCM200/400 - Manual (Page 101)

Chapter 5 Checking the installation prerequisites 91
BCM200/400 4.0 Installation and Maintenance Guide
• 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
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 BCM system:
• “Basic hardware”
• “Optional equipment”
• “Other hardware and tools” on page 92
Basic hardware
The BCM system consists of some combination of the following hardware:
• main unit
• expansion unit
• media bay module (MBM)
• telephones
• cabling for connections between hardware units
Optional equipment
You can add the following equipment to the BCM 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)
• analog emergency telephone
• optional WAN card field replaceable unit (FRU)
Note: You must include specific features in the keycode file for some hardware to
function.