Справочник Пользователя для National Instruments NI CardBus-8310-to-PXI Expansion

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Chapter 1
Introduction
1-6
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If one or more LEDs for a given port (L0 or L1) are not lit, it indicates that 
the twisted pair represented by that LED is not properly connected. 
Table 1-3 describes the status indicated by each unlit LED. The same 
descriptions apply for the L0 LEDs and the L1 LEDs.
Link problems may involve one or more LEDs turning off, depending on 
the affected differential pair. It is recommended that you re-seat the cable 
to see if that resolves the issue. It is also possible that one of the port cables 
may need to be replaced.
Note
A faulty cable may link some differential pairs while disabling others and the LEDs 
can be used to isolate the faulty cable. If replacing the cable does not resolve the issue, there 
may be a problem with the StarGen bridge. In that case, contact National Instruments with 
the information described in th
 section of Appendix C, 
Table 1-3.  Unlit LED Status Descriptions
LED
Description
0
The PXI card senses no link on its differential pair 0.
1
The PXI card senses no link on its differential pair 1.
2
The PXI card senses no link on its differential pair 2.
3
The PXI card senses no link on its differential pair 3.