Take a look my post up what options you have with load balance, i have edit my post ... i am sure the same apply for the 2860

It will not do line bonding to double your speed (that you need to talk with your isp) ... only the methods i mentioned can set the faster line to use it as primary & permanently until you untick manually that wan
http://www.broadbandbuyer.co.uk/Features/Article.asp?TextID=1412

They are right... It's load balancing, not bonding so you will not get faster speed
on a single speed test. If you, on the other hand, run two downloads at
the same time, it would be faster than running with on WAN.