Hello,
Adding to what ste already pointed out. There are some key differences between .ac and .n when testing under lab conditions:
1. .ac allows 256QAM modulation while .n allows a max of 64QAM. 256QAM provides 33% more throughput than 64QAM, theoritically speaking. And as ste pointed out, this may not be seen in the real word as 256QAM requires much higher SNR than 64QAM which is typically not avaiable in the real world. 256QAM also has limited range. Unless you are doing short links, you may not be able to take advantage of it.
2. On the ePMP are you using the GPS sync unit or one of the other units? Only the GPS sync unit has a GigE port (but see note below on our latest Force products) while the other units have a FE port (10/100). So it may be that you are limited by Ethernet capacity. Even if one of the radios on the link is a FE port, your throughput will be below 100 Mbps.
And to answer your last question, yes it is possible to achieve more than 100 Mbps with ePMP. Use the GPS sync radio on both ends and use a 40 MHz channel (you may get more than 100 Mbps on a 20 MHz under perfect lab conditions). And lastly, we introduced two new products yesterday, the Force 180 and Force 200 which both come with GigE ports.
Thanks,
Sriram