
Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000 Introduction 1 - 1
1 Introduction
-48 Volt Cabinet Power System
Overview The J85500R-1, CPS 4048, -48V Cabinet Power System (CPS) is an
extremely flexible power system designed for cabinet applications
where space conservation and environmental considerations are critical.
By limiting the system depth to 12 inches, the -48V CPS architecture
permits the cabinet designer to locate revenue-generating equipment
behind the power system in 24-inch deep cabinets.
The plant supports -48V primary loads up to75 amperes in a single shelf
with an embedded battery disconnect. In a two-shelf plant it can also
deliverregulated+24 voltsfor secondary loadsup to50amperes. Above
150 amperes, an external battery disconnect is required.
-48V CPS power units feature automatic load-share circuits that force
the power units to apportion the plant load equally, reducing the stress
on individual units. These power units are self-protected so that short
circuits and system overloads are handled automatically; i.e., if a short
circuit is removed or a system overload reduced, the power units will
automatically resume normal operation.The power modules are
designed to operate in ambient temperatures of -40° to +65°C (-40°to
149°F), with excursions to +75°C (167°F), and are provided with
self-contained cooling fans, making the -48V CPS a reliable power
solution for various outside plant applications. Its dual power bus
architecture supports applications where more than one voltage is
required, which eliminates the need to invest in two separate power
plants.
Signal interfaces between the -48V CPS rectifiers and the plant control
unit provide alarm monitoring, rectifier output voltage adjustment, plant
current monitoring, LED test, and rectifier On/Standby control. For
converters, the signal interface with the control unit provides alarm
monitoring and lamp test, but does not allow voltage adjustment or
current monitoring.