I see on cambium networks TDD with atheros chips, so i think is posible in mikrotik radios.
what do you think?
I ask if is posible chage RATIO TDD???
i think this is userfull to Video security cameras.
Isn’t tdma (nv2) basicly the same thing? Except yes last time I checked you can’t specify a ratio. That would be very useful though cos you do lose a bit of downstream with nv2 but with more stable link in nv2 for multiple clients.
re: … you can’t specify a ratio …
It would be very interesting if the TDMA / NV2 timing ratios settings were in an AP. It would be a possible great feature to be able to set an NV2 AP to something like 80 percent of the time-window to SEND and 20 percent of the time-window to RECEIVE.
Most normal/busy networks are 80/20 if you examine the traffic flow.
Without any documentation, I suspect that existing NV2 timing could be 50/50 with equal time slots in both directions. If so, then an NV2 AP could be squandering some unused time waiting during the receive window while it has send packets buffered up in a RED (Random Early Detect) condition - thus resulting in slower traffic from an AP to clients. If there was a percentage setting available - I wonder if it could potentially speed up the total average customer traffic by an additional 30 percent faster traffic to clients ???
North Idaho Tom Jones
Yeah I would love to see a ratio setting on nv2 I never ran a wisp that used 50/50 it’s more like 5/95 in real life these days up/down
estar
kinda related to this topic and kinda not
If you limit somebodys UP bandwidth to about 5 percent of what their DOWN bandwidth is configured for - then TCP/IP starts to fall apart and the customer download speeds are almost impossible to hit.
So- If you do rate-limit customers - keep in mind never exceed 95/5 or things start to break.
80/20 is a good radio
85/15 is what Verizon typically uses - pretty low if you thought you had a high-speed DSL account.
North Idaho Tom Jones
I’m just saying what the real life ratios are of upload to download in real life usage. Not that I have used those rate limits in working networks. However on hotspot users I’ve limited by 20 megs down and 2 up which works fine that’s 90/10 so I’m not sure your correct. Will try sometime.
Tom’s pretty close.
10% is probably the minimum, but you have to account for overhead, packet loss, retransmits, etc…
If you are on 2.4 and have a foggy night, 10% upload might just see the entire network slow to a crawl due to upload packet loss.
Tom’s pretty close.
There is also a dramatic difference in the behavior of the network in a hotspot vs WISP situation.
TDMA doesn’t really make much difference on short range. You might gain a bit of bandwidth due to lower overhead, but that’s it.
NV2 or Nstreme can make the difference between working and not working on larger networks with distances measured in miles vs feet.