User`s guide

The Control Unit
The control unit is the vital core of the system. It provides the power and
intelligence for all your telephones, and it directs incoming and outgoing call
traffic. All the system’s memory, including systemwide administration, line
assignments, and phone programming, resides in the control unit. Figure 2-1
shows a typical control unit with the front cover removed.
FIGURE 2-1 The MERLIN II system control unit.
The control unit must contain the following modules:
● Power Supply Module
● Processor Module
● Circuit Pack (008 or 408) Module in slot 1 of the basic carrier.
NOTE: There is no required slot assignment for line and/or station modules
(008, 008D, 400w/TTR, 408, or 800) except that the module in slot 1 of
the basic carrier must be a 008 or a 408 module.
The Control Unit 2-1