Analog loop
The following parameters must be met for an analog loop:
maximum dc loop resistance of 208 Ω
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•
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:
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"Basic hardware"
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"Optional equipment"
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"Other hardware and tools" on page 78
Basic hardware
The BCM50 system consists of some combination of the following hardware:
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main unit: BCM50, BCM50a, or BCM50e
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expansion unit
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media bay module (MBM)
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telephones
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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:
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station auxiliary power supply (SAPS)
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key indicator module (KIM) for T7316E telephones
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analog terminal adapter 2 (ATA2) if connecting analog equipment to a digital extension line
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uninterruptable power supply (UPS)
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USB hub (required if the system uses a UPS)
Chapter 6 Checking the installation prerequisites
BCM50 Installation and Maintenance Guide
77