You mis-read my post. The Bourns part is not the one I have, it's one I was looking at buying.
I did more searching and I think I found a couple of splitters that look like the one I have here:
ADSL Band Attenuation
> 65 dB; 30 - 300 kHz, ZTr = 600
> 55 dB; 300 - 1104 kHz, ZTr = 600
Stopband (DSL Band) Characteristics
DSL Attenuation 60 dB min; 800 k - 10 MHz
It's hard to tell, I can't find a part number on it.