The AW provides the same functions provided by the AM. These are those functions
that are best performed out of the call processing environment:
— Administrative
— Maintenance.
In addition, the AW provides the CM2 function of passing messages from the AM to
the switching module.
The AW contains special software which allows the functionality of the AM and CM2
to be economically provided for the single-switching-module DRM. At the center of the
software is the AW’s UNIX Operating System (see Figure 2-47).
Running on the next layer is the AM 3B21 emulator, assist processes, and the CM2
simulator. This layer of software is essentially mimicking, or emulating, the actions of
the AM’s 3B21D computer. The 3B21D computer is a highly reliable — fault tolerant
computer capable of providing administrative and maintenance functions for up to 192
switching modules. This level of sophisticated hardware is not necessary for the
single-switching-module DRM. Thus the hardware has been replaced by a software
program which emulates its actions. The CM2 simulator simulates the actions of the
CM2 in passing messages from the AM software to the switching module. Again, in
the single-switching-module DRM, the CM2 is not necessary. Its primary role was to
perform switching between switching modules, and in the case of the DRM, there is
only one switching module.
Running on the next layer is the UNIX Real Time Reliable (RTR) Operating System.
This operating system normally runs on the 3B21D computer and provides the
functions needed for the AM software to run on the 3B21D.
Running on the outer layer is the AM software. This is the same feature-rich software
which runs on the 5ESS switch and CDX switch AM.
AW UNIX®
OPERATING
SYSTEM
AM SOFTWARE
3B21 EMULATOR
UNIX® RTR OS
CM SIMULATOR
ASSIST PROCESS
Figure 2-47 — AW Software Architecture
235-200-150
Feburary 2007
5ESS
®
SWITCH DISTINCTIVE REMOTE MODULE
Issue 3.00O Page 2-61
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