This is my first attempt at using MT and any help will be gratefully welcome.
I am building a hotspot for three buildings and have the following star topology setup of RB411s connected to a central RB433.
RB433 <-> many RB411 (with level 4 license) <-> Clients (laptops)
Before buying all the hardware, I wanted to run some tests. The scenario I tested was RB411 in AP-bridge, R52n in b/g mode, two 7dbi omni antennas, with both chains ON. All other settings are default. AP is placed outdoors (on ground) and client laptop is 20m away (Indoors on 2nd floor) with 1 wall obstruction.
The readings from winbox wireless settings were:
Signal Strength = -77 dBm
SNR = 34 dBm
Tx/Rx CCQ = 36%
P. Throughput = 7.7 Mbps
Tx/Rx rate = 11/36Mbps
Using Inssider, the signal strength on the laptop was -80dBm.
I also ran an FTP test: a 10MB file transfer from laptop to AP. Average throughput of ~4000 Kbps. But, the throughput remains the same even when the laptop is kept close to the AP.
In general, over any distance with LoS, I am not getting lower than 70dB readings, although links are formed upto 100m. My main goal is to push the RSSI levels to below 70 (on laptop) and below 75 (on AP) in order to have a safe margin for a 54Mbps link.
My issues are:
* Even if signal strength values are not a good indicator (as discussed in many threads), the CCQ values are pathetic. They also keep fluctuating (30-60%).
* The laptop is seeing poor signal strength values. Will r52hn help in increasing signal strength at the laptop?
* Do I need a higher gain antenna? My main worry is that a high gain antenna will reduce the omni-direction capability and I need all round connectivity (that is, good elevation).
* Is there any tutorial on how to compute link budget for MIMO case and in such mixed outdoor-indoor scenarios?
Some links here that were useful while I started:
http://forum.mikrotik.com/viewtopic.php ... na#p172669