Thanks a lot. 
Hi! 
The 16751A can operate in a 16700 or 16900 series frame. 
 
<LI class=MsoNormal style="COLOR: navy; mso-list: l1 level1 lfo3">If the module is installed in a 16900 series frame, the system software can be downloaded from 
www.agilent.com/find/la-sw-download The system software contains the support for the modules.  If the module is installed in a 16700 series frame, you can go to the following site to request a CD with the 16700 series system software.   if you need a newer Logic Analyzer series module with faster state/timing speeds, differential support, etc you should go with the 16900 series 
Hope this helps  
If not please let me know 
Thanks and regards 
Niki Haines.