Table 3. PXIe-8522/8523 LED Indicators
LED Label LED State LED Color Condition
LINK/ACT Off — No link established
Default power-up state
Solid Green Link established, 100 Mb/s
1
Blinking Green Activity, 100 Mb/s
1
Solid Amber Link established, 1000 Mb/s
Blinking Amber Activity, 1000 Mb/s
STATUS Off — Default power-up state
Solid Green Direct Mode, master (PHY state)
Amber Direct Mode, slave (PHY state)
Fade in and out
2
Green Tap Mode, master (PHY state)
Amber Tap Mode, slave (PHY state)
Blinking Green Port ID
Amber Not synchronized
Red Catastrophic error
3
Synchronization Methods
The PXI and PXI Express chassis feature a dedicated synchronization bus integrated into the
backplane. NI-XNET products support use of this bus to synchronize with other NI hardware
products such as DAQ, IMAQ, and NI Motion Control. The PXI synchronization bus consists
of a flexible interconnect scheme for sharing timing and triggering signals in a system.
Local Time
The module uses PXI_Clk10, a 10 MHz PXI backplane clock, to drive the local time keeper
and to synchronize with other modules in the PXI chassis. If the PXI backplane clock is not
available, the module uses an internal oscillator.
PXI_Clk10 provides frequency but not date/time information. When an NI-XNET session is
created, XNET initializes the date/time information for the local clock using host time.
1
This pattern only applies to the PXIe-8523.
2
When in Tap Mode, ports that are paired fade in phase with each other, but out of phase with other
ports.
3
In the case of a catastrophic error, recover by invoking Reset on the module in MAX. Contact NI
for further support if the error continues to occur.
12 | ni.com | PXIe-8522/8523 User Manual
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