While TCP/IP will make some use of a duplex link, in general, many TCP/IP communications are simplex in nature. Web browsing, email retrieval are all relatively one-sided data flows.
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You can indeed put two ID-1s back to back and send Ethernet traffic between them in what looks like a two-way path. But unless you had some filtering, you’d never be able to pull off full-duplex. Most people never realize that the ID-1 is half-duplex. But if you look at the front panel lights, you see the red and green lights constant blinking at each other. The ID-1 has an extremely fast turnaround compared to most other radios. I believe that it is less than 10 ms., as opposed to the standard AX.25 radio that has 150 ms.
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The ID-1 does allow a significant number of services compared to many other solutions. With the higher power, it does have some good range without resorting to highly directive antennas. The Ethernet/TCP/IP (It will do NetBEUI or Novell if you want) transport means that many applications can be used as-is. We don’t have to create special applications as we did for packet radio. It’s also in a somewhat exclusive portion of the ham bands, so we don’t have to share it with everyone.
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With all of its shortcomings, it still can make some EMA managers drool over our capabilities!
From: D-STAR_23cm@... [mailto:D-STAR_23cm@...] On Behalf Of let_cyber Sent: Sunday, October 25, 2009 12:55 AM To: D-STAR_23cm@... Subject: [D-STAR_23cm] full duplex?
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Thanks for the comments regarding my disappointment with the DD mode.
I seem to remember a ham in Canada using 2 ID1's back to back as a full duplex repeater. Has anyone tried this? Any downside? (except for the cost of 2 radios).
