Why is it that f200L has 100mbps Eth yet the ordinary F200 can go up to 1gbp Eth is this really development or its about going back wards
Because it is L version. Where U want to use 1 Gb on this radio ?
The “L” behind the model means Lite, which is a cheaper version and of course the Ethernet speed is lower than the classic force 200.
Regards
Remember also that wired Ethernet is full duplex, so if you are running 50% / 50% duty cycle (or if you are running flexible frame) then you can get 100 megabit download, plus 100 megabit upload before you run into an ethernet bottleneck - which probably means your 100mb full duplex ethernet will likely be able to keep up to your 802.11n radios.
And if you are running a 75% / 25% duty cycle on a PTMP AP, then your 200L SM’s radio would have to be doing 100 megabit download plus 33 megabit upload before The ethernet would be the bottleneck, which again your 802.11n radios will likely be topping out at around the same time as 100 megabit wired ethernet is topping out.
In other words, in the real world, it probably doesn’t negatively impact performance. 
Also, the F190 & F200L were the last 100mb radios if I remember correctly. All of the F300 series and all of the F4000 series are all gigabit. So they were two generations ago. 
That being said, I am with you in spirit. I’ve certainly was disappointed that the 4000 series AP didn’t have a 2.5 GB ethernet. Clearly there was some thought to doing that, and there are POEs with 2.5 Gb, but I was surprised that they made the decision for the PTP and PtMP APs not to include 2.5 GB ethernet, especially when at the chipset level there is so little difference in cost.
Dear your port set on auto negotiate plz set manual on gig