Nortel Networks COMMUNICATION SERVER 1000 NN43021-110 - Manual (Page 47)

Hardware architecture 47
Meridian attendant consoles support attendant message center options.
The attendant console can be connected to a PC to provide electronic
directory, dial-by-name, and text messaging functions. All call processing
features can be accessed using the computer keyboard.
Power equipment
Large Systems provide a modular power distribution architecture.
Each column includes:
• a system monitor that provides:
— power, cooling, and general system monitoring capabilities
— error and status reporting down to the specific column and module
•
circuit breaker protection
•
a cooling system with forced air impellers that automatically adjusts
velocity to meet the cooling requirements of the system
• backup capabilities
Each module includes:
•
an individual power supply unit with shut-off (switch or breaker)
protection
•
a universal quick-connect power wiring harness that distributes input
voltages and monitor signals to the power supply
All options are available in both AC-power and DC-power versions.
The selection of an AC- or DC-powered system is determined primarily
by reserve power requirements and existing power equipment at the
installation site.
Although AC-powered and DC-powered systems have different internal
power components, the internal architecture is virtually identical. AC- and
DC-powered systems differ primarily in the external power components.
AC power
AC-powered systems require no external power components and can
plug directly into commercial AC (utility) power. AC-powered systems are
especially suitable for applications that do not require reserve power. They
are also recommended systems that require reserve power with backup
times ranging from 15 minutes to 8 hours.
If reserve power is required with an AC-powered system, an
Uninterruptible Power Supply (UPS), along with its associated batteries
(either internal or external to the unit), is installed in series with the AC
power source (see
Figure 17 "ExternalAC-power architecture with reserve
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
.