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Theory of Operation
SYSTEM
ARCHITECTURE
The MERLIN II system architecture provides a digital
network that supports voice and data communications.
The modular nature of the system makes the base
configuration efficient and easy to expand. The control
unit contains the memory for the system’s features,
Input/Output (I/O) functions, and interface requirements.
The various modules are electrically connected to a
backplane assembly that provides common circuitry for
the I/O bus, Time Division Multiplex (TDM) bus, and
power distribution. Refer to Figure 1-9 for a fictional
block diagram of MERLIN II system architecture. System
architecture is made up of the following items: a
Processor Module interconnected to intelligent port
modules by an I/O bus; a communications network made
up of a TDM bus connected to the DigitaI Switch Element
(DSE) of each module; and a Power Supply Module.
1-36 Theory of Operation