I would suggest this test be done in that post. I'm sure Jim would be
more than happy to comply.
Josh Reynolds
CIO, SPITwSPOTS
www.spitwspots.com
On 04/18/2015 08:13 PM, Faisal Imtiaz wrote:
While I applaud the initiative to do a comparison test, there are
quiet a few things in this test presentation that would cause one to
raise an eyebrow...
First one that jumps out is ... how come an 802.11n radio is grouped
together with all of these other 802.11ac radios ? (EPMP is not the
same category radio as the others)
Additionally, information is lacking about what firmware versions were
in use with these radios, and I believe choosing a fixed tx power for
the test, as an approach to equalize testing parameters is bound to
provided some skewed results.. especially with radios which are auto
balancing power on the CPE side, e.g. epmp and also the mimosa's..
A few years back, Exalt ran a similar test for their Extend-air
radios, they list out their test setup in detail here
...http://www.exaltcom.com/ExtendAir-vs-Wi-Fi.aspx
I believe if the comparison between these different radios were done
along the lines of Exalt test, the results would be much more
meaningful to real life deployment...
... My experience with the couple of AC radios is that they need SNR
to be as high as possible....which greatly affects performance,
additionally, with the Mimosa's I see they are pretty comfortable in
working with -30 signals... not sure if the other AC products behave
the same way....
While it is nice to see which radio can deal with interference, I for
one would like to know how these different AC radios perform when the
SNR is reduced...along with how 'hot' of a signal they can deal with ...
e.g. with the Mimosa, we see them operating, and performing well, with
a -30/-34 signal when the noise floor is -60.... I for one would be
interested in seeing what the other AC radios do in such conditions.
Regards
Faisal Imtiaz
------------------------------------------------------------------------
*From: *"Mathew Howard" <[email protected]>
*To: *"af" <[email protected]>
*Sent: *Saturday, April 18, 2015 8:52:37 PM
*Subject: *Re: [AFMUG] Very interesting post..
This test ignores a few kind of important details... the UBNT and
Mikrotik AC radios have no ability to sync, which gives them a
significant disadvantage. also, the Mimosa radios are
(theoretically) capable of higher throughput since they are the
only ones with the ability to use two 80mhz channels... granted,
it's pretty rare that is actually possible in the real world, but
if you had synced Mimosas everywhere, it could be done. He's also
using a $499 ePMP radio, when he should be using a $200 Force110 PTP.
That said, the conclusion the the AF5x is the best is probably
right :P
On Sat, Apr 18, 2015 at 5:55 PM, Ken Hohhof <[email protected]
<mailto:[email protected]>> wrote:
If your criterion is performance in the presence of a signal
on a different frequency 30 dB stronger than the desired
signal, this analysis is relevant. Also, this seems to be the
scenario airPrism is designed to address. But how often would
this occur? Even if the interference is from another
non-synced transmitter on the same tower, you’d think
directional antennas would knock the interfering signal down
to less than 1000 times the desired signal.
I guess this could be realistic if you have a point to point
link in the same band as a sector, so that a giant dish at the
other end is pointed right at your sector.
*From:* Josh Reynolds <mailto:[email protected]>
*Sent:* Saturday, April 18, 2015 5:34 PM
*To:* [email protected] <mailto:[email protected]> ; Seth Mattinen
<mailto:[email protected]>
*Subject:* Re: [AFMUG] Very interesting post..
Horseshit, read the article. Did you miss the portion where
Jim said "it's the exact same chip that's in the RM5"?
I would have liked to have seen the RM5 in this test as a
baseline, but ignoring the results simply because it's N tech
in the EPMP is silly. Not only does the throughput drop, but
the LEVEL it degrades at is only "bested" by the B5C in a few
of the tests. N or not, that's a very poor result.
I would love to see other tests posted on this from other
people, its always nice to have multiple sources to remove any
potential level of bias.
Jim did an excellent job on this and should be commended.
On April 18, 2015 2:26:50 PM AKDT, Seth Mattinen
<[email protected] <mailto:[email protected]>> wrote:
On 4/18/15 2:49 PM, Peter Kranz wrote:
Very interesting shootout comparing AF5X, AC-Lite, AC
PTP, EPMP-1000,
B5c and RB922
https://community.ubnt.com/t5/airMAX-Stories/Radio-Shootout-Pt-2-let-s-try-a-whole-bunch-of-them/cns-p/1232309
Dude didn't seem to catch that the ePMP is an N radio and dismisses
it
as worst of the worst. Looks to me like it would probably hold up
comparably to its AC counterparts if you take that into
consideration.
~Seth
--
Sent from my Android device with K-9 Mail. Please excuse my
brevity.
