Chapter 6 Checking the installation prerequisites 77
BCM50 Installation and Maintenance Guide
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.
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)
Note: You require keycodes for some hardware to function.
