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Chapter 6 Checking the installation prerequisites 77
Chapter 6
Checking the installation prerequisites
Before you install a main unit or expansion unit, perform the following tasks:
• Determine the location for the BCM50 units, telephones, and other equipment based on space and electrical requirements.
• Order the required trunks from the central office.
• Ensure that you have all the equipment and supplies you need to install the system.
For information about BCM50 installation prerequisites:
•
Environmental requirements on page 77
•
Electrical requirements on page 77
•
Site telephony wiring requirements on page 78
•
System equipment, supplies, and tools on page 79
Environmental requirements
Ensure you meet the installation environmental requirements. The installation area must be:
• a minimum of 4 m (13 ft.) from equipment such as photocopiers, electrical motors, and other equipment that produces electromagnetic, radio frequency, and electrostatic interference
• within 1.5 m (5 ft.) of a three-wire grounded electrical outlet
• clean, dry, well ventilated, and free of traffic and excess dust
• within the temperature range of 5°C and 50°C (40°F and 120°F)
• from 20% to 80% non condensing relative humidity
• structurally strong and with enough space to support the BCM50 units
• a minimum of 46 cm (18 in.) from the floor
Note: The installation area must be of sufficient height from the floor to prevent water damage.
Electrical requirements
Ensure you meet the following electrical requirements:
• Power must be supplied from a non switched, unobstructed outlet within 1.5 m (5 ft.) of the
BCM50 units.
• The supplied power must be a dedicated 110 V to 120 V AC nominal (or 220 V to 240 V AC nominal), 50 to 60 Hz, 15 A minimum service with a third-wire safety ground. The third-wire safety ground provides shock protection and prevents electromagnetic interference.
Installation and Maintenance Guide
78 Chapter 6 Checking the installation prerequisites
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.
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
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.)
NN40020-302
Chapter 6 Checking the installation prerequisites 79
System equipment, supplies, and tools
For the equipment required to install the BCM50 system:
•
•
•
Other hardware and tools on page 79
Basic hardware
The BCM50 system comprises a combination of the following hardware:
• main unit: BCM50, BCM50a, BCM50e, BCM50b, BCM50ba, or BCM50be
• 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 you connect analog equipment to a digital extension line
• uninterruptable power supply (UPS)
• USB hub (required if the system uses a UPS)
Other hardware and tools
You need the following equipment to install a BCM50 unit:
• mounting hardware
(either a rack-mount shelf, a wall-mount bracket per unit, or four rubber feet per unit)
• Phillips #2 screwdriver
• flat blade screwdriver
• pliers
• antistatic grounding strap
Installation and Maintenance Guide
80 Chapter 6 Checking the installation prerequisites
• punch-down tool
• surge protector (recommended)
• cables, 25-pair cable with right-feeding female RJ-21 connectors
• 3.5-mm mono audio jack (for external music source)
NN40020-302
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