I wanted to share some interesting elements that I have noticed on a 27 kilometers link recently installed by myself.
Summary: PTP link | Master - MT 433 (6.0rc9) with XR2, Slave - UBNT Bullet2HP (XS2.ar2316.v184.108.40.20696.120423.0955) | 802.11b | signal Tx/Rx -68/-67 dBm | noise floor -99dBm | signal to noise 30 dB
1. At the beginning, I established a fixed ACK Timeout/Distance on both side with 27 kilometers and I was having a ~ 3.5 Mbps throughput rate. However, after selecting dynamics on the MT unit and activating the auto adjust on the UBNT unit, my rate has improve immediately to 7.2 Mbps.
2. I also noticed that during no data transfer, my Rx/Tx CCQ is ~33/100% but when I start transmitting it goes up to 100/100%. (?)
Distance is actual plus a mile or so. If it's too long you will slow your self down because ACK packets are taking longer than they should. Too short and you have way to many retransmits because the radio's are getting ACK packets too soon if at all.. It's a TCP thing LOL -- »www.wirelessdatanet.net