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<DIV><FONT face=Arial size=2>Speaking of fiber, has anyone found a low priced
source for 100 megabit or higher fiber converters? Salvage, excess?
Last time I looked they were scarce and expensive.</FONT></DIV>
<DIV><FONT face=Arial size=2>73,</FONT></DIV>
<DIV><FONT face=Arial size=2>Fred</FONT></DIV>
<DIV><FONT face=Arial size=2>Wa8KCW</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=n0ttw@yahoo.com href="mailto:n0ttw@yahoo.com">Chris Salinas</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=hpsdr@hpsdr.org
href="mailto:hpsdr@hpsdr.org">SDR</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, March 11, 2007 4:34
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [hpsdr] Ozy with Gb
Ethernet</DIV>
<DIV><BR></DIV>***** High Performance Software Defined Radio Discussion List
*****<BR><BR>
<P>
<HR>
<P></P>
<DIV>Just my thoughts guys:</DIV>
<DIV> </DIV>
<DIV>On the issue of bandwidth, 100 Mbps would be sufficient for SDR if it was
on a dedicated line. But if you put it into an existing network that is busy,
then you may be dealing with a bottleneck. I believe that this is cutting edge
radio, it deserves a cutting edge medium, plan on using full-duplex Gigabit
fiber. </DIV>
<DIV> </DIV>
<DIV>Twisted pair at Gig levels is critical when installing boxes and
connectors. I do it often at work and I have a dificult time doing it right.
Fiber on the other hand, is easier. Tool investment is about the same, so that
is why I like fiber. (have that at work too).</DIV>
<DIV> </DIV>
<DIV>Since we're dealing with sensitive receiver(s) in this project, fiber
won't induce noise. All you would have to worry about is noise from computer
equipment (I use a laptop) and supporting boards in the SDR.</DIV>
<DIV> </DIV>
<DIV>Another issue is to determine what protocol would be used for certain
functions of SDR. UDP and TCP are two protocols to consider in the design.
Using UDP on some functions helps in reducing overhead on the network. UDP is
commonly used for streaming video and audio on the internet. However, UDP
doesn't get an ACK back when its packet is sent, so it shouldn't be used for
critical things like firmware patches and the like. But it does make for
smaller packets and helps reduce overhead on the network.</DIV>
<DIV> </DIV>
<DIV>Just my 2 cents,</DIV>
<DIV>Chris N0TTW</DIV>
<P>
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