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Basic carrier
Expansion
carrier
FIGURE 1-4 Control unit components.
●
Power Supply Module. The Power Supply Module
receives an input of 117 VAC and supplies the system
with the following dc voltages: +5, -5, and -48 VDC.
The Power Supply Module can support up to 45 unit
loads per carrier. (A unit load is a measure of power
used to determine the electrical load of the MERLIN II
system.) if the system’s power requirements exceed 45
unit loads, an Auxiliary Power Unit must be used. This
device supplies an additional 20 unit loads to the
system. For more information on unit loads and the
Auxiliary Power Unit refer to “Determining Unit Load
Requirements” on page 2-57.
If the system uses Basic Telephone (012) Modules, a
Frequency (Ring) Generator must be installed in the
Power Supply Module.
System Hardware 1-19