The front panel contains four ports with two port status LEDs assigned to each port. In addition, there is an Attention button (labeled ATTN) and two system-level LEDs located next to the ATTN button.
Figure 2 Front Face of the EM
1 Port 0
2 Port 1
3 Port 2
4 Port 3
5 ATTN (attention) button
6 Attention LED
7 OK (power status) LED
8 Link LED
9 Activity LED
The following table explains how to interpret the behavior the activity and link LEDs.
When you want to perform a hot-plug operation with an EM, press the ATTN button. This removes power from the slot the EM is in so it can be removed while the chassis remains powered up.
Note - Power remains present at the slot for a period of time after the ATTN button is pressed. This is referred to as the power transition period.
Caution - Do not insert or remove the EM during the power transition phase of a hot-plug operation. This power transition phase is the period just after the ATTN button is pressed when the EM might not be fully isolated from the power source.
In addition to the port status LEDs, there are two LEDs next to the ATTN button. The following table explains their meaning.