We have a tower with 2 antenna pointing to 2 diffrent directions, about 40-50 KM, both side equipment is the same
the grids is 31 DBI with R52H on both sides with VP, boards is 433AH
We have a good -70 signals, and nstreme is enabled, RouterOS versions is 3.30
Every few minutes, can be few hours as well, The link suddenly drops and comes back up
We have tried superchannel license with every possible frequency, also changed channel width to see if makes difference, but no luck
Nstreme disabled also makes no difference, doing a bandwidth test i get 15mbits each way, so speed is there
I have tried setting the disconnect timeout to 10s to see what happens, but still drops
Also tried 433AUH board with some other radios , that DBii Networks 802.11a High Power Card with RF Line Protection , but still no change
Also verified with installers we have clear LOS and antennas not to close to each other, ALso we in the middle of nowhere , not much on the tower but us
almost from the beginning, on nstreme Disabled i had alot of duplicate packets, once nstreme enabled, the link became stable
we then had power issue at tower which we sorted out
i see the links very sensitive to dropping, its stays up for hours , then if i work on the other link which is dropping alot, then the more stable one suddenly drops and comes back up
I however have alot of mpls running on there with ospf, but this shouldnt be any problem
i had a look at my stats on the reg table to the more problem link
could this be something on the tower thats causing it, some kind of bigger telco kit?, we considering changing tower as we had some strange problems on this site with power( we have ups) and the links is 50km+
Try to swap R52H with R5H (if you need little more dB) or use old good CM9.
We have some long links with R52H and have same problems until changing radio cards.
If you hardware retries set to 4 try to change hardware retries to 15 or maybe litter higher. I also have link 25km signal -80, with connect disconnect every couple minutes after changing hardware retries to 15 have up time couple of days.
From manual:
hw-retries (number 0..15; default value: 15) : Number of times sending frame is retried without considering it a transmission failure.
Data rate is decreased upon failure and frame is sent again. Three sequential failures on lowest supported rate suspend transmission to this destination for the duration of on-fail-retry-time. After that, frame is sent again. The frame is being retransmitted until transmission success, or until client is disconnected after disconnect-timeout. Frame can be discarded during this time if frame-lifetime is exceeded.