3Com 3C780 User Guide - Page 118

Media Module LEDs

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5-16 Using the Hub Reinitialize. If you press the RESET button only briefly, the hub reinitializes and performs the power-on self-tests (POST). The tests take several seconds to complete. LED Check. If you hold down the RESET button, all functioning LEDs on all installed modules light. This allows you to determine whether any LEDs are not functioning. When you release the RESET button, the reinitialize function begins. Media Module LEDs Each port connector on each module is equipped with three LEDs. The Signal Detect LED indicates whether or not a received signal is present. The Port State LED indicates the port's connection state. The Link Error LED indicates the existence of a link error or a marginal connection. Figure 5-9 shows the location of the LEDs on the STP module. The LED locations are the same on the other media port modules. Table 5-10 interprets the meaning of the LED colors. LED legend GRN = SIGNAL DETECT GRN = PORT STATE YEL = LINK ERROR ® PWR Signal Detect Port State Power (PWR) LED Figure 5-9. LEDs on the STP Module Link Error

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5-16
Using the Hub
Reinitialize.
If you press the RESET button only briefly, the hub reinitializes
and performs the power-on self-tests (POST).
The tests take several seconds to
complete.
LED Check.
If you hold down the RESET button, all functioning LEDs on all
installed modules light.
This allows you to determine whether any LEDs are not
functioning.
When you release the RESET button, the reinitialize function
begins.
Media Module LEDs
Each port connector on each module is equipped with three LEDs.
The Signal
Detect LED indicates whether or not a received signal is present.
The Port State
LED indicates the port’s connection state.
The Link Error LED indicates the
existence of a link error or a marginal connection.
Figure 5-9 shows the
location of the LEDs on the STP module.
The LED locations are the same on
the other media port modules.
Table 5-10 interprets the meaning of the LED
colors.
Signal Detect
Port State
Link Error
PWR
®
GRN
GRN
YEL
= SIGNAL DETECT
= PORT STATE
= LINK ERROR
LED legend
Power (PWR) LED
Figure 5-9.
LEDs on the STP Module