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System architecture 13
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a midnight routine or on a conditional basis (i. e. , data dump only occurs
if a software service change has been made). It may also be invoked
manually via the input/output (I/O) interface to the system.
Software Audit
This program monitors system operation and gives an indication of the
general state of the system operation. The program is concerned mainly
with the system software. When a software problem is encountered, the
program attempts to clear the problem automatically.
Hardware architecture
Each Meridian 1 system is composed of the following hardware
subsystems:
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Common equipment (CE): Provides the device control, software
execution, and memory functions of the system.
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Network equipment (NET): Performs the switching function under
CPU control.
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Peripheral equipment (PE): Provides the interface for line and trunk
circuits.
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Terminal equipment: Telephone sets and attendant consoles.
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Power equipment Provides the electrical voltages required to operate
equipment.
Common equipment
Common Equipment (CE) consists of one or more Central Processing Units
(CPUs), memory circuits, and mass storage devices which control the
operation of the system. The CE communicates over a common control bus
which carries a constant flow of program instructions and data under direct
control of the CPU. The digitized speech signals follow a separate path on a
network switching bus which allows communications links to be established
between any of the peripheral devices.
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The Central Processing Unit (CPU) provides the computing power
essential for entire system operation.
System overview 553-3001-l 00
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