US Robotics USR3520 User Manual page 95

Pinout
Yellow LED:

Active when operating speed is 100Mbps

Inactive when operating speed is 10 Mbps or when not connected
Green LED:

Active when valid links are detected

Blinks when activity is detected

Inactive when not connected
IMPORTANT: The auto-MDIX feature is always activated on the gateway. This feature automatically
detects the required cable connection type (straight or crossed), and configures the connection
appropriately, removing the need for crossover cables. In order for auto-MDIX to work correctly,
auto-negotiation (auto speed and auto duplex) must be enabled on both sides of the link. Note that
auto negotiation is always active on the gateway.
Revision: 1.00 Copyright 2015 U.S. Robotics Corporation 95 | P a g e