Communications Cable

I've got a client who really doesn't like prefab cables or the larger
diameter Belden DeviceNet thin cable that is the proper 120 Ohms impedance.
They'd like to use this Alpha Cable which is rated at 100 Ohms +/- 10.
Bit rates are 250kbps, total length of network isn't an issue.  Of course
the hardware which has embedded termination is terminated at 120 Ohms.
 
http://www.mouser.com/ds/2/14/6459%20OR005-213474.pdf
 
I'd like to be able to tell them not to use it but for a small network with
minimal noise producing peripherals I'm running out of arguments.
 
Any suggestions?
 
Thanks
John Dammeyer
 
 
"ELS! Nothing else works as well for your Lathe"
Automation Artisans Inc.
 <http://www.autoartisans.com/ELS/> http://www.autoartisans.com/ELS/
Ph. 1 250 544 4950