[TriEmbed] I2C range extension

John Vaughters jvaughters04 at yahoo.com
Fri Oct 2 08:06:11 CDT 2015


One thing that bothers the heck out of me is if you look at the Pi, What is the largest component on the device? The GIANT RJ45 connector. How in this world where every thing has shrunk have we (as in the technical community) allowed this gross misuse of size with only a few wires be soooooo large?
Why haven't we shrunk the ethernet connectors like everything else?
Concerning designs that do not have power or cost limitations, clustered processors have switching ethernet chips with 1GB or larger swithcing fabrics built into the board itself. Or in the case of blade style computing, there is a network built into the backplane. This of course eliminates the connectors, except for some ouput ports to join the network. This is a long topic in and of itself.
My suspect is that TCP/IP is costly and power hungry. It never had the focus of low power use and has always been designed for throughput. This is not really a good combination for the robotics needs of efficiency on cost and power. Maybe this is why nobody has tried to morph ethernet into the small microprocessor world. On top of that TCP/IP has been a code hog in terms of valuable program space. Of course that problem is becoming less and less. 
I would be curious if anyone else has some thoughts on the reasons why ethernet has not shrunk.
Despite the all these reasons, I still think a small ethernet form factor would be great for Pi or other platforms. It seems so simple and I am a bit amazed no one has attempted it.
John Vaughters

 


     On Friday, October 2, 2015 8:37 AM, Pete Soper via TriEmbed <triembed at triembed.org> wrote:
   

   WIthout a switching converter on the other end the wrong order of magnitude of current is available:
 
   https://en.wikipedia.org/wiki/Power_over_Ethernet#Power_capacity_limits
 
 On 10/02/2015 07:02 AM, Jim Ray via TriEmbed wrote:
  
 <!--#yiv7987412117 _filtered #yiv7987412117 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv7987412117 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv7987412117 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv7987412117 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv7987412117 #yiv7987412117 p.yiv7987412117MsoNormal, #yiv7987412117 li.yiv7987412117MsoNormal, #yiv7987412117 div.yiv7987412117MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;font-family:"Times New Roman", "serif";}#yiv7987412117 a:link, #yiv7987412117 span.yiv7987412117MsoHyperlink {color:blue;text-decoration:underline;}#yiv7987412117 a:visited, #yiv7987412117 span.yiv7987412117MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv7987412117 p.yiv7987412117MsoAcetate, #yiv7987412117 li.yiv7987412117MsoAcetate, #yiv7987412117 div.yiv7987412117MsoAcetate {margin:0in;margin-bottom:.0001pt;font-size:8.0pt;font-family:"Tahoma", "sans-serif";}#yiv7987412117 span.yiv7987412117EmailStyle17 {font-family:"Calibri", "sans-serif";color:#1F497D;}#yiv7987412117 span.yiv7987412117BalloonTextChar {font-family:"Tahoma", "sans-serif";}#yiv7987412117 .yiv7987412117MsoChpDefault {font-family:"Calibri", "sans-serif";} _filtered #yiv7987412117 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv7987412117 div.yiv7987412117WordSection1 {}-->  Has anyone modified Raspberry Pi to use PoE for power? Using standard Ethernet to drive a communications sub system based on another Raspberry Pi that has the requisite i/o and processor makes a lot of sense to me. 
  
 
 -Pete
 
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