David,
I totally appreciate your attention to when and when not analytical modeling
works. Let me clarify a few things from your note.
First, Little's law (also known as Little’s lemma or, as I use in my book,
Little’s result) does not assume Poisson arrivals - it is good for any arrival
pro
Thanks very much for this response. I need to dig in a bit more for sure.
iperf 2 will give every UDP packet's OWD (if the clocks are sync'd) and
will also provide TCP write to read latencies, both supported in histogram
forms. So that's raw samples so to speak. I'm hooking up some units across
ge
I will tell you flat out that the arrival time distribution assumption made by
Little's Lemma that allows "estimation of queue depth" is totally unreasonable
on ANY Internet in practice.
The assumption is a Poisson Arrival Process. In reality, traffic arrivals in
real internet applications ar
I can't speak for others. I've been successful in early prototyping using
one for simplistic off-diagonal h-matrix testing, i.e. varying the h-matrix
condition numbers. I see this as a small step in the right direction for
conductive, automated, and reproducible testing.
Developing a system that s
Thanks for the clarification. There are vendors that make these, but we have
not tried
integrating our software control with any of them. To date, not many of our
customers
have been interested in this, so it did not seem worth the effort.
Do you see this as being useful for normal AP vendors
Sorry, I should have been more clear. Not a fixed butler matrix but a
device with solid state, programmable, phase shifters, 0 - 360 degrees.
It's a way to create multiple phy channels and affect and vary the off
diagonal elements of a MIMO H-matrix using conducted parts. Then
automation software c
We tried adding in an external butler matrix in the past, but could not notice
any useful difference. Possibly
we didn't have the right use case.
Typically we are competitive on price for full testing solutions, but you can
get stand-alone attenuators
cheaper from specialized vendors. Happy t
The four part attenuator part would be more interesting to me if it also
had a solid state phase shifters. This allows for testing 2x2 MIMO testing
per affecting the spatial stream eigen vectors/values.
Bob
PS. The price per port isn't competitive. Probably a good idea to survey
the market compe
Hello,
I am interested to hear wish lists for network testing features. We make test
equipment, supporting lots
of wifi stations and a distributed architecture, with built-in udp, tcp, ipv6,
http, ... protocols,
and open to creating/improving some of our automated tests.
I know Dave has some
Some terminology if one cares:
Segments are transported(Layer 4)
Packets are networked(Layer 3)
Frames are data linked (Layer 2)
and last but not least
Streams: flow over the air (Layer 1)
_
From: Starlink [mailto:starlink-boun...@l
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