Acer ALH-608ds - Manual (Page 19)

Note: It's normal either Master or Slave LED will display when hubs
are stacking.
Note:The difference between Master hub and Slave hub will be
explained in chapter 3.
Collision: Indicate if a collision occurs in 10Mbps or 100Mbps domain.
Bridge: Indicates if the bridging function is enabled.
Note: The slave hub will provide a Bridge Uplink Port, see chapter 3 for
details.
2.4.3 Network Status Indicators
There are 3 LED indicators to indicate the network status of each connection
port.
2-11 User's Manual
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