Hi all, I have a 5km link that pushed a lot more bandwidth when I first set it up and I am not sure why… software changes? Here are some stats from the master and slave…
If you do a path analysis in linkplanner do the signal numbers match up? I always start with a baseline and make sure I am getting the signal I am supposed to. By looking at your numbers I would say you are spot on, but I would want a sanity check before I went further.
Sorry - I’d love to help more, but we’ve pulled all ours down and replaced them.
That being said - I can still probably give some pointers to try to help out… I left one PTP550 up (1.4km link) just for testing, so I can log into it and try things to try and brainstorm and try to help you out.
@ninedd, thank you. I just assumed that at this distance and the stats I have I would be able to get more throughput on a single 40mhz channel… but if this is all its capable of then I am fine with that…out of curiosity what did you replace your 550s with?
@DigitalMan2020 - I don’t think we never really had results to much different than yours. I was searching the forums to see if I had posed some results… I don’t really remember exactly offhand what throughput was.
But in summary, there was no good solution I could find.
TDD mode, the latency is too high for a critical PTP
ePTP mode latency is still much higher with more jitter than 1000/2000 series
ePTP mode isn’t compatible with F200 or F300 ePTP mode
TDD modes isn’t compatible with F200 or F300 TDD mode
ePMP mode doesn’t work in bonding, so it’s a choice between latency vs throughput.
No full-duplex mode
No way to configure, reset, test, optimize one of the radio pairs at a time
without tearing down both radios and totally disrupting client traffic.
To answer your question: I replaced them with either:
Force 300csm in TDD mode in a few places with modest throughput / latency requirements,
OR
in most places where we need higher throughput and flatter latency,
I replaced the PTP550s all with AF5xHD
check on the sourounding if you do not see many radios in 5 GHz band.
Maybe the 25 and 32 Km are in rural area without much interference. If your installed is on a very busy tower/spot with a lot of 5 GHz radios, between choose narrow channels or use licensed radios (18 GHz band on the PTP 820S for example).
DigitalMan2020; The maximum TCP throughput we could achieve under LAB conditions was 330Mb/s regardless of configuration. UDP throughput is much higher. The high speed results shown by Cambium’s PTP550 product test are for UDP - they just don’t say that. I have removed all PTP550’s from service and won’t be using them again until the TCP throughput is >1Gb/s.
Hi, thank you for your reply… yes they do match up with link planner but in link planner I added some frequency interference… but as you can see by my stats I have little interference. When we first launched this link I was getting 330mbps down and 80mbps up, 40mhz channel, only thing has changed is firmware… original firmware was 4.4.3… I was considering rolling back… only reason to upgrade firmware was to use eptp, which was and is a complete disappoint.
@gregn, thank you for your reply… ya unfortunately alot of people have said they have pulled these out of production… but I do not have that option, being a new wisp and investing in the 550 because of the great features/performance that was being portrayed… but in real world deployment it seems to be the opposite.
@ninedd I truly appreciate all your input and replies! Thank you for the info and I may truly need to switch the Air Fibers… when I can spend the capital lol… so what kind of throughput/latency are you getting on your links? Would you mind sharing your results and what distance those Air Fiber links are?
as you said you were getting “…254mbps DL and 69mbps UL 323mbps aggregate…”, this is quite not well balanced for such a link.
In my personal experience with radios in the 5 GHz in city/town deployment, I usually consider my sourounding environment even tough when the noise is not apparent in statistics whenever I use a 5 GHz. Usually, Wireless ISPs tend to use the same towers with good and large coverage for access (point to multipoint) and backhauling (Point to point). That is why I asked you about the sourounding environment. Be precise on this so that we have a view of the space you are operating in. Otherwise, try out a licensed radio above 10 GHz if you stick on the 5 GHz.
I know we all are running after interference is the issue here but it’s not… I had been on a previous channel and my throughput was bad and in the MCS for UL and DL were modulating poorly, I am modulating at 100% DS 9 on DL and 94% DS 9 in a light to moderately noisy environment.
@Olympe Performance is exactly as it was when I posted screenshots at the beginning of the thread… from most responses in this thread I can see that many are disappointed in the overall performance of the 550, I am also in that camp. I can’t believe how little can be pushed through at a 5km link with very little interference and the price for these units based on performance is truly mismatched. A lot of individuals have gone back to ubiquiti Air Fibers and Im not too far from that either.