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Supply Module and allows the carrier to support an
additional 20 unit loads. With an Auxiliary Power Unit, a
single carrier MERLIN II system can add accessories
without the expense of an expansion carrier. Refer to
Table 2-8 for the approximate unit load requirements for
the equipment listed.
NOTE:
Only voice terminals and accessories that
connect to an analog port have unit loads. Any
equipment with its own power supply does not
have to be included in the unit load calculation.
The unit load requirements in the table assume the
following conditions:
●
A “unit load” is defined as a measure of power
equaling 44 milliamperes (mA) at 43 volts (under
load).
●
A maximum of 1000 feet of wire for each voice
terminal.
●
Above average use of voice terminals and accessories.
●
Full volume on each voice terminal speaker.
To determine the total unit load, follow these steps:
1 Make a list of all voice terminals and accessories that
are intended for use with the system.
2
Refer to Table 2-8 to find the unit load for each voice
terminal and accessory you have listed. The
equipment listed in Table 2-8 includes all the items
that will affect a MERLIN II system unit load
requirement. Do not include items such as the Display
Console or modems because they have their own
power supply and do not affect the system’s power
requirements.
2-58 Installing the Control Unit