Probably yes, but not necessarilly.
It really depends on how much all the non-guaranteed users are using.
My average usage per business client is 16 kbps average usage 95%tile. If
your business clients have similar usage statistics, you'd do fine with the
Trango capable of pushing 2.5 mbps. One of the things to understand is that
most all Internet service types (T1s, DSL) are also effected by packet size
just like the radio links. So if you are comparing guaranteed bandwdith T1s
at 1500 mtu, its fair to compare it to Trango at full 1500 mtu.
The secret is to have good bandwidth management that works on a PRIORITY
basis. If the Hospitol has guaranteed bandwdith, the hospitol's bandwdith
ALWAYS gets sent through first. The big advantage of wireless is it gives
you the abilty to sell unused bandwidth allocated to one client to others at
a lower prioirty. The question you need to ask your self is not wether you
are selling the hospitol guaranteed bandwdith, it wether the hospitol uses
an average of the bandwdith speed (1.5mbps) that you are selling them. If
they are likely to sustain that speed for long periods of time, then maybe
the additional radio is needed.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Mac Dearman" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Thursday, June 15, 2006 5:53 PM
Subject: RE: [WISPA] true thru for Trango 900
Thanks for the reply Tom. The reason I asked was I just sold a dedicated
T1
to a hospital and they are currently on one of my Trango 900 AP's along
with
10 other businesses. After reviewing what you posted it looks like I
better
hang another 900 AP just for them or find another solution!
Thanks,
Mac Dearman
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Tom DeReggi
Sent: Thursday, June 15, 2006 4:46 PM
To: WISPA General List
Subject: Re: [WISPA] true thru for Trango 900
Mac,
As long as you are running the wired Ethernet side on 100mbps,
We have been able to get an aggregate speed of 2.4 mbps in the lab and in
live deployment, with average size packets.
(Unfortuneately I do not remember what we declared as average size
packets,
but it may have been windows minimum limit of around 500 mtu).
(for example 1.2 mbps in each direction simultaneously or 2.4 mbps in one
direction)
One way, with full size packets, we could get as high as 2.9 mbps in a lab
environment.
Take note that if you run the Trango at wired 10mbps ethernet, and small
packets, the radio total throughput drops significantly, even though 3mbps
RF is 1/2 less than the wired 10 mbps spec. Since those tests we alway
run
the 900 radios at 100mbps wired ethernet, when ever we can. With large
packets I don't think it made much difference. We were surprised at the
results. But this was an issue for us because we had installed the APs at
500ft using 10 mbps. It was the reason for a noticeable degregation of
speed compared to what our original lab tests that were higher using
100mbps.
To answer your question specifically, we noticed very little difference on
which direction the data was going or at what percentage was going in each
direction. Thats the big advantage of TDD systems and half duplex.
Obviously there has to be some degregation, but not a large enough amount
that we could measure it with our tools. We believe half duplex to be
more
efficient and less wasteful of spectrum. But that only applies when a
radio
can switch the direction it sends data without degregation of speed.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Mac Dearman" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Thursday, June 15, 2006 1:13 PM
Subject: RE: [WISPA] true thru for Trango 900
Has anyone ever done a test on Trango's 900MHz gear?
I know it says 3Megs throughput, but what will it really do full duplex?
Thanks,
Mac Dearman
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