PXIe-6674T sync to backplane

Hi,

I'm trying to sync the PXIe-6674T oscillator to my PXIe-1095 backplane clock.  I don't know why NI can't keep their terminology consistent throughout the documentation.  The user manual never once mentions "oscillator" as a source.  At any rate, I tried to use the Route Clock.vi example to sync the clocks.  I connected "oscillator" to "PXI_CLK10_IN".  I don't get an error when doing so, but the "active" LED light doesn't turn on, which makes me think the backplane isn't deriving the PXI_CLK10 and PXIe_CLK100 from the PXIe-6674T.  My ultimate goal is to use the PXIe-CLK100 as the clock for my PXIe-7856R.

Thanks for any help.