Nortel Networks COMMUNICATION SERVER 1000 NN43021-110 - Manual (Page 56)

56 System architecture
Call processing, maintenance, and administration are controlled by
software programs stored either as firmware programs, as software
programs resident in system memory, or as nonresident programs on disk.
The information that describes system configuration and associated IPE is
called office data. This data resides in the system memory and on disk.
Firmware
Firmware provides fundamental programs consisting of hard-wired
logic instructions stored in Programmable Read-only Memory (PROM).
Firmware programs manipulate data in the central processor and control
input/output operations, error diagnostics, and recovery routines.
Software
Software programs consist of instruction sequences that control call
processing, IPE, administration, and maintenance functions. Several
generic software programs with optional feature packages are available.
Office data
Office data describes the characteristics of the system in terms of
configuration and call-dependent information, such as features and
services. Office data is arranged in blocks defining IPE, system
configuration, and transient data.
Resident programs
Resident programs are always available in memory during system
operation. Some resident programs are permanently programmed
into the ROM portion of system memory. Other resident programs are
automatically loaded into system memory at system power-up.
Resident programs include:
• Error Monitor, which continuously monitors call processing
• Initialize Program, which locates faults, rebuilds data, and releases
reserve memory areas
•
Overlay Loader, which locates, checks, and loads programs into the
overlay area
•
Overload Monitor, which monitors the volume of system messages and
determines where overloads occur
•
Resident Trunk Diagnostic, which monitors all trunk calls
• System Loader, which loads resident programs from the disk drive unit
into system memory at power-up
• Traffic Monitor, which examines the system schedule, transfers traffic
data from accumulating to holding registers, and produces reports
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Large System Overview
NN43021-110 02.05 Standard
30 September 2008
Copyright © 2003-2008 Nortel Networks
.