I would look at signal and modulation level to see if you lost something moving
to the new tower. Like maybe you had a bunch of SMs that were at 3X but now
are at 2X for some reason. Is the new tower in exactly the same spot as the
old one? If not, did you re-align the SMs? Also the new sector antenna might
have a little different gain or pattern, or maybe you need to tweak the
orientation or downtilt. This is a sector not an omni, right?
There is also a setting in compatibility mode to choose MIMO-A or SISO, I think
that only matters on marginal links. I have ours set to the default which I
believe is MIMO-A, but you could experiment with it. I really hate having
links at 1X anyway, so assuming yours are mostly 3X with the occasional 2X,
this should only matter during a fading or interference situation.
From: Sam Kirsch
Sent: Thursday, February 19, 2015 9:22 AM
To: af@afmug.com
Subject: Re: [AFMUG] Expected throughput on 450APs handling a fair amount of
430SMs on Interop mode?
We weren't capping out the 430AP, no. It was replaced because the tower was
replaced and in order to get a smooth transition and keep an eye towards the
future we put a 450AP on the new tower and just swapped the SM's into
Interoperability mode and moved them to the new color code. We figured we
would see at least equal if not better performance, which it sounds like should
be the case. I guess I'll proceed with the assumption that performance across
the AP isn't the issue, thanks!
-- Samuel Kirsch, Network Support
Plexicomm - Internet Solutions | www.plexicomm.net
Office: 1.866.759.4678 x109 | Fax: 1.866.852.4688
Emergency Support: 1.866.759.9713 | sam...@plexicomm.net
------ Original Message ------
From: "Mark Radabaugh" <m...@amplex.net>
To: af@afmug.com
Sent: 2/18/2015 4:15:22 PM
Subject: Re: [AFMUG] Expected throughput on 450APs handling a fair amount of
430SMs on Interop mode?
We have done this multiple times. I would expect to see performance
basically double for any customer you switch from a 430SM to a 450SM. Overall
throughput of the AP should increase pretty proportionally as you replace 430
SM's with 450's. If you were capping out the 430 (which seems odd if you were
only pushing 24Mb), and you didn't swap any of those customers to 450 SM it
would still be doing the same as the 430.
We are seeing peaks of ~41Mbps on a 450 AP with 83 customers with a split of
63 430 SM's and 20 450 SM's. Yeah, it's probably time for another AP, but I
see plenty of customers holding 4 and 6Mb steady.
Mark
On Feb 18, 2015, at 1:59 PM, Sam Kirsch <sam...@plexicomm.net> wrote:
I have a 450 that was very recently put up in place of a 430AP. 16/22
Customers are 430s in Interop mode, the rest are 450s.
What can I expect as maximum throughput? I was sort of expecting greater
or equal performance to a 430, but I've had a lot of odd feeback from customers
since we switched this over from a 430 AP to a 450AP with mostly 430SMs.
I only have one Microtik at a customer location that I can do a bandwidth
tests too but it's a rate limited SM, so its a little hard to gauge based on
that alone. Most of the time it seems like there should be plenty of bandwidth
available, but just getting too much odd feedback to not check out all the
possibilities.
The bandwidth usage charge also tracks a falling utilization over the past
few weeks. I've gone from seeing peaks at 22-24mpbs to peaks at 12-15mbps.
Nothing should have changed out there as far as usage, I'd still be expecting
to see something in the neighborhood of 22-24 on average. If anything it
should be pushing more as the schools are all off for a week.
Does anyone have any sort of clear info on what we should be expecting
here?
-- Samuel Kirsch, Network Support
Plexicomm - Internet Solutions | www.plexicomm.net
Office: 1.866.759.4678 x109 | Fax: 1.866.852.4688
Emergency Support: 1.866.759.9713 | sam...@plexicomm.net
