Case study: PtmP CPE510 (STA) to [CPE510 (CL) vs. CPE610v1 (CL)]

Case study: PtmP CPE510 (STA) to [CPE510 (CL) vs. CPE610v1 (CL)]
Case study: PtmP CPE510 (STA) to [CPE510 (CL) vs. CPE610v1 (CL)]
2019-07-14 21:55:58
Model: CPE610
Hardware Version:
Firmware Version:

Hi all,

 

been struggling with this for a long time, personal issues have kept this at a 'beta' stage for quite some time so I decided to just post this somewhat raw and hope that I get some constructive feedback in return which will (hopefully) mend the usuability of this thread in the long run.

 

In this case I was looking to improve on the throughput I was getting via some PtmP links by substituting some client's CPE510s (CL) primarily being served by CPE510s (STA) within a 30º horizontal beamwidth. Aiming for the CPE610 on the CL sides seemed like the logical thing to do and so I started off by ordering one piece to test how things would go in the beginning and take it from there in case I was satisfied with the results.

 

Having used the CPE610 in CL mode in two different installations so far all I can say is that I'm getting pretty mixed results - which don't really make much sense. Let me elaborate to draw a clearer picture.

 

The setup is such that the CPE510 (STA) is aiming midway at +/-15º to the positions being served by the CPE610s in CL mode. Having achieved the best aiming one could hope for and whereas the receiving SNR on the CPE610 does indeed improve by a factor of about 30%, as does the downstream throughput I'm really struggling to achieve anything even remotely close to parity with the CPE510 when it comes to upstream. Best-case scenario upstream is -30% in BOTH SNR and throughput which is a big letdown to say for sure. Knowing that the CPE610 incorporates a 6-8º horizontal beamwidth I'm beginning to think that the CPE510 horizontal inclination differential is to blame (the CPE610 pointing towards the CPE510 precisely - however the CPE510 being off by 15º at best)...However if that's the case then why is the CPE610 such a strong performer when it comes to downstream since the same logic applies (yet inverse the CPE610 being on the receiving end here)..

 

I'd really appreciate some comments on this since at this stage I'm a bit puzzled by the contrasting results..

 

RT.

Now serving finite customer via f(x)=AirTime/∞ on the 5Ghz band :-/
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3 Replies
Re:Case study: PtmP CPE510 (STA) to [CPE510 (CL) vs. CPE610v1 (CL)]
2019-07-16 03:20:22

I learned from the datasheet on the official website of tp-link that the antenna gain of CPE610 is far greater than CPE510,

so theoretically CPE610 has the stronger anti-interference ability.

In addition, three reflector plates are added to CPE610, so it is better than CPE510 in the ability to receive signals.

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Re:Case study: PtmP CPE510 (STA) to [CPE510 (CL) vs. CPE610v1 (CL)]
2019-07-16 21:49:42 - last edited 2019-07-19 18:57:02

In case I did not make myself clear with my first post.

 

The CPE610 in CL mode indeed exhibits superior performance compared to the CPE510 BUT when the two CPEs are NOT completely aligned to one another as in this case study where one CPE510 (STA) serves multiple CPE610s (CLs) then the CPE610 apperently has issues with the uplink when the horizontal differential falls over the CPE610's 9º degrees max beamwidth specification..such are my findings so I'm making this case here for future reference. Either that or my CPE is faulty? :/

 

...so bear that in mind before deploying several CPE610s..

Now serving finite customer via f(x)=AirTime/∞ on the 5Ghz band :-/
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Re:Case study: PtmP CPE510 (STA) to [CPE510 (CL) vs. CPE610v1 (CL)]
2019-07-19 18:47:45 - last edited 2019-07-19 18:57:48

..which brings me to yet another piece of oversimplified thought.

 

Under the current f/w implementation the max Tx power for the CPE610 limited by the EIRP limit is 5dBm..Bearing in mind this is a 23dBi antenna design. On the other hand max Tx power for the CPE510 is 17dBm, with that antenna being a 13dBi one. Am I the only one seeing a disparity between the two? If we were to add the respective values - surely quite incorrectly in doing so - leads to a ballpark total Tx power of 28dBm for the CPE610, whereas it yields a 30dBm total Tx power for the CPE510.

 

Which begs the question: Shouldn't the EIRP limit be set to 7dBm instead of 5dBm for the CPE610?

Now serving finite customer via f(x)=AirTime/∞ on the 5Ghz band :-/
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