Cisco rv 120w Quick Start Manual page 7

Power on the cable or DSL modem and wait until the connection is
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active.
Connect the power adapter to the Cisco RV 120W power port.
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Click Next.
Use only the power adapter that is supplied with the unit.
C
AUTION
Using a different power adapter could damage the unit.
Plug the other end of the adapter into an electrical outlet.
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Cisco Small Business RV 120W Quick Start Guide 7