B&B Electronics 855-12840--49 - Manual - Manual (Page 19)

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TX ACTIVITY Glows amber when data is being passed on the TX port.
LEDs on McGigabit and McLIM TX/FX and TX/SX (-00, -10, 20,
30)
The LED functions on McGigabit and McLIM TX/FX and TX/SX Modules are as
follows:
FX LINK/ACT Glows green when link is established on the FX port; blinks
green when activity is detected on the port.
TX LINK/ACT Glows amber when link is established on the TX port; blinks
amber when activity is detected on the port.
ACTIVITY Glows green in normal operation.
LEDs on MediaConverter Chassis
4-Slot and 8-Slot chassis include LEDs on the back of the chassis.
POWER Glows green when chassis has power.
ACTIVITY This LED blinks green when data is being passed on either port
of a module that does not include Link/Activity LEDs; applicable
to modules only.
LEDs on Power Supplies
Power supplies include the following LEDs:
POWER Glows green when powered-on.