National Instruments VXI-1394 - Manual (Page 49)

Appendix C Advanced Hardware Configuration Settings
VXI-1394 User Manual for Windows C-8 ni.com
Figure C-4. Generate Internal CLK10 and Drive to the Backplane
In Figures C-5 and C-6, switch S5 uses the alternate configuration to
generate the VXIbus CLK10 signal. Instead of the onboard oscillator, the
VXI-1394 generates from the external CLK SMB connector and drives to
the backplane. You can choose whether to terminate the signal using S1.
Polarity remains irrelevant to these configurations.
EXT
CLK10
TERMINATE
Y N
SMB
TRIG TERM
OUT IN
NON INV
S1
S2
S3
S4
S5
CLK10 SOURCE
SMB ONBRD