SENA UPSLink100 - Manual (Page 12)

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The [Link] lamp will light up green.
The [Act] lamp will blink to indicate incoming/outgoing Ethernet packets
The [100Mbps] lamp will light up green if the UPSLink is connected to 100Base-TX network
The [100Mbps] lamp will not turn on if the current network connection is 10Base-T.
Figure 0-3 Connecting a network cable to the UPSLink
2.2.3 Connecting UPS to the UPSLink
Connect both ends of the console cable to the UPSLink serial port and the serial data port of the UPS,
Please refer to the 0 0 A.4 Serial wiring diagram for details.
Figure 0-4 Connecting a UPS to the UPSLink