Figure 2-5: Piu Module Front Panel - Nera WILINK I System Manual

Chapter 2 - Installation Guidelines
PIU modules provide redundant power feeding (two input sources) while avoiding
current flow between the two input sources.
NOTE
The HOT SWAP blue LED does not exist in first generation PIUs.
CAUTION
In a first generation PIU (without HOT SWAP LED), disconnect power from the PIU module before
inserting/ejecting it to/from the chassis. Before disconnecting the power cable from the PIU, the
power source must be disconnected to avoid irreversible damage due to a potential excessively
high transient current.
In a second generation PIU (with HOT SWAP LED), disconnect power from the PIU module only
after it is taken out from the chassis (or after the HOT SWAP LED is turned on). Connect power to
the PIU only after it is fully inserted into the chassis.
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Figure 2-5: PIU Module Front Panel

WILINK I MODULAR BASE STATION SYSTEM MANUAL