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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