MLP performance depends on the platform
being used. If you have a DS3, you
must have a larger end platform, in
which case 6-8 should not be a problem.
The 7200, for example, could support
16 T1s in any combination without
WFQ (use FIFO), interleaving, fragmentation compression.
Adding Fragmentation and WFQ will cut
capabilities in half or greater.