Service manual

1
Field-Replaceable Units
1-9
General Information
Figure 1-5 Small Form-Factor Pluggable (SFP) transceiver
Power Supply
Redundant, load-sharing power supplies step down and rectify
facility input power to provide 48-volt direct current (VDC) power to
director FRUs. The power supplies also provide overvoltage and
overcurrent protection. Either power supply can be replaced while
the director is powered on and operational.
Each power supply has a separate backplane connection to allow for
different AC power sources. The power supplies are input rated at 85
to 264 volts alternating current (VAC). The faceplate of each power
supply provides the following status LEDs:
• A green PWR OK LED illuminates if the power supply is
operational and receiving AC power.
•AnamberFAULT LED illuminates if the power supply fails.
•AnamberTEMP LED illuminates if the power supply shuts
down due to an over temperature condition.
•AnamberILIMLED illuminates if the power supply is
overloaded and operating at the current limit (15.6 amperes).
RFI Shield
The RFI shield covers and provides RFI protection for all rear- access
FRUs except the power module assembly. The RFI shield is
concurrent and can be removed or replaced while the director is
powered on and operating.