Allied Telesis AT-A19 - Manual (Page 13)

AT-A1x Series Expansion Modules Quick Install Guide
7
Note
All modules except the AT-A18 modules are shipped with a dust
cover over the ports.
8. Verify the LEDs on the expansion module’s front panel by referring to
Table 2.
Table 2 Expansion Module LEDs
The AT-A1x Series Expansion Module is now ready for use.
LED State Description
Activity/Link Solid Green Indicates a 100 Mbps link.
Flashing Green Indicates 100 Mbps activity.
Solid Amber Indicates a 10 Mbps link (10/100 ports only).
Flashing Amber Indicates 10 Mbps activity (10/100 ports only).
Full Dup/Half Dup/Col Solid Green
The port is operating at full-duplex.
Solid Amber The port is operating at half-duplex.
Flashing Amber Collisions are occurring on the line.