Given the varying packet sizes, router configurations, and other variables at play, we don't publish specific throughput numbers - it's just too subjective. However, I can tell you that we do not recommend the 1335 for any application where process-routing would exceed 25Mbps in total. In your case, 35Mbps down/2Mbps up would total 37Mbps and would exceed our recommended limits. You would be better served to separate the router and switching functions and go with a dedicated router like our NetVanta 3430, which has a recommended limit of 60Mbps.
Adtran Applications Engineering