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96 Chapter 2 Auxilliary Requirements and Installation Process Overview
P0993133 03
The Business Communications Manager (or expansion unit) power cord is 1.5 m (5 ft) long. You
can connect the power cord to a power bar with a maximum length of 2 m (6.5 ft), including power
bar. You must use a power bar approved by an appropriate National Test Body, with a third wire
ground. Do not use an extension cord between the platform base chassis and the power bar, or
between the power bar and the electrical outlet.
The cable between the Business Communications Manager expansion unit and the Business
Communications Manager is supplied with the expansion unit. Do not use any other cables or
connectors.
Internal Wiring Requirements
This section describes the requirements for a digital loop and an analog loop within the system.
Digital Loop
The following parameters must be met for a digital loop:
• one, two, or three twisted-pair cable(s) per telephone
• dc loop resistance of less than 64 :
• 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
The following parameters must be met for an analog loop.
• maximum dc loop resistance of 208 :
• maximum cable length (0.5 mm or 24 AWG) of 1220 m (4000 ft.)
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 together. If these ground
connections are not connected together, contact the appropriate electrical inspection
authority. Do not try to make the connections yourself.