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COMSPHERE –48 Vdc Central Office Power Unit
1-2 May 1998 3000-A2-GB41-40
NOTE
Customer-supplied cable
assemblies must comply with
items 5 and 6 of the
Important
Safety Instructions
at the front of
this guide.
For more information on the alarm cables and NMS
adapter cable, see Appendix A of this guide.
Part numbers for the CO Power Unit and its related
components are listed in Appendix B of this guide.
Features
The CO Power Unit provides the following features:
• Enables DCEs supported by the COMSPHERE
3000 Series Carrier to operate in a –48 Vdc central
office environment.
• Provides the following three modes of operation:
— Basic mode – the mode in which the single
power module supplies power to the entire
carrier. This mode of operation is the only
mode available for the CO Power Unit with one
power module.
— Redundant mode – the mode in which two
power modules supply power to the entire
carrier. If one power module fails, the
remaining power module assumes the full load
of the carrier. To operate in this mode of
operation, you must install an optional second
power module in the CO Power Unit.
— Independent mode – the mode in which each
of the two power modules supplies power to
one-half of the carrier. To operate in this mode
of operation, you must install an optional
second power module in the CO Power Unit.
• Provides forced air cooling for the carrier via a
–48 Vdc fan in the power module.
• Provides an optional air filter which prevents dust
from entering the CO Power Unit and the
COMSPHERE 3000 Series Carrier.
• Detects power module and fan failures by
monitoring the power output levels and the fan’s
low-speed sensor for proper operation of the power
module. When a failure occurs, an alarm indication
light appears on the power module’s faceplate.
• Sends power failure and/or fan failure alarms to a
CO alarm system and/or a 6800 Series NMS via a
Modular 3611 DSU.
Figure 1-1 illustrates the CO Power Unit with one
power module in the left side of the CO power tray. In
Basic mode, the single power module can be installed in
either the left or right side of the CO power tray.
Figure 1-2 illustrates the CO Power Unit with two power
modules.