D-Link DSL-500 Quick Install Manual page 6

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Connecting the DSL-500/CZ Connecting the DSL-500/CZ
To setup the DSL-500/CZ begin by connecting it to a power source.
Once the unit power is on, insert one end of the included Ethernet cable
into the DSL-500/CZ's Ethernet port, and the other end into the Ethernet
port on the NIC installed in your PC.
If the cable connection is good, a green LED on the front of the DSL-500/CZ
labeled Ethernet/Link will glow steadily.