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
