PMP and ePMP

What is the difference between ePMP and PMP devices?

Its so many differences. I have this comparison in portuguese but... i will try. 

PMP 450 does not require guard bandwidth (ePMP 5mhz), supports 238 clients per sector (ePMP 120), latency 3-5 (ePMP 12-15), supports QinQ (ePMP no), 256QAM (ePMP 64QAM), 125mbps @ 20mhz (ePMP 200mbps @ 40mhz).

Spectral efficiency: 6.25bps / hz (ePMP 5bps / hz)

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