straightforward way to integrate applications that rely on standard network sockets for their
network communication.
LED Functionality
The PXIe-8521 includes two LED indicators per port to help you monitor hardware and bus
status.
LED Label
LED State
LED Color
Condition
LINK/ACT
Off
—
No link established
Default power-up state
Solid
Green
Link established, 100 Mbits/s
Blinking
Green
Activity, 100 Mbits/s
STATUS
Off
—
Default power-up state
Solid
Green
Direct Mode, master (PHY state)
Amber
Direct Mode, slave (PHY state)
Fade in and out
1
Green
Tap Mode, master (PHY state)
Amber
Tap Mode, slave (PHY state)
Blinking
Green
Port ID
Amber
Not synchronized
Red
Catastrophic error
2
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 National
Instruments 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 PXIe-8521 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 PXIe-8521 uses an internal oscillator.
1
When in Tap Mode, ports that are paired fade in phase with each other, but out of phase with other
ports.
2
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.
10
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ni.com
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PXIe-8521 User Manual
