why this link Can not transport More than 35 mbps real traffic ?
CCQ always more than 95%
RX / TX signal level ( 55-60 ) / dual chain
output power 17
Free LOS
distance = 1200 m
superchannel
Are u routing something or it is simple p2p link
Signal to noise is a bit high
have u try nstreme
are you doing a bandwidth test from AP to Station?
@ Lakis :
it’s simple p2p link ( wireless Mode :Bridge - station Bridge ) /// bridgh port > wlan1-ether1
nstreme ??? Nooo …
plz post nstreme configuration (wireless mode - security and etc )
@ semakka
speed test result From AP to CPE
UDP ( transmit ) : 139 mbps
TCP (Transmit ) : 37 mbps
TCP ( Both ) : 17 /18
65dB STN is too high?.. It’s almost “perfect” you mean.
@ hipro5
i think 65 dB Signal to noise is the best result for 1.2 km link with 17db tx power !
Never do a bandwidth from AP to CPE if you want to see how much your throughput is. You will overload the CPUs of your AP and CPE.
Place 2 big resourceful daddy routers at both sites and b-test between them through the PtP Link, in the end that’s what you want to know.
You need to know how much traffic is passed through, not how much data your AP can send to the Station.
I’m sure this was explained before and you’ll find reference on wiki@mikrotik.
cheers,
Steven
@seanet: with it’s internal CPU running at 400MHz, while you run the bandwidth test between them, the CPU of the AP goes up to 100% load and it CAN’T produce more data to send to the CPE.
Try EXTERNAL traffic generator (from a desktop pc through a 1G LAN connected to AP) and re-test…
@ semakka : you beat me to that post by ~1min… 
Bugger… 
I’ll buy you a beer )))))
Steven
rb1100ahx2 ___eth(cat6)__Sextant(bridge)<---->Sextant(station bridge) eth(Cat5e)>Rb450G
test result rb1100 to 450g >>> just 8mbps !!!
RB450G? that has the same CPU as your link RB’s.
I’m sure you can do better than that
You need more than a RB450, maybe another RB 1100AHx2
Steven
450G with 680mhz cpu !!!
but throughput lower than sextant AP to CPE 
…
Are you sure all eth ports of all RBs are negotiated at 100M Full Duplex?
yes of course
do UDP b-test between the rb1100AHx2 and the bridge and another between BR450G to the station bridge. Send and receive, but not both.
if they both turn to be close to 100mbps and between RB1100AHx2 and RB450G is still 8… you have a wireless problem
maybe use WDS?..
steven
rb1100 ---- sextant 98 mbps
rb450 ---- sextant 96 mbps
i don’t use wds
We have seen this before, it will work just got to keep tweaking.
The bandwidth test that you are doing, are you using tcp or udp, and if using tcp are you using the default 20 connections?
To avoid the whole cpu peaking during btest’s, use udp just to get a feeling of how the link is performing.
Are you colocating these at sites with other 5Ghz equipment? Sextants have a very poor front to back ratio, and are very susceptible to noise from other devices.
In NV2 make sure you have set the cell radius close to your actual distance. In the data rates section define it to use a rate selection of advanced.
What are the speed differences when changing the link from nv2 to 802.11. Generally speaking, unless its a very long link nv2 really only shows its benefits in a PtMP setting.
whatever is best for u
in best practice SNR should be around 30-40db - never the less this does not mean in all conditions should be correct