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Unfortunately, I can't tell you what equipment uses what termination techniques. At the time at which I was collecting information, I went through semiconductor application notes and collected as many varied types of terminations as possible. I then further enquired with 3Com engineers and engineers at the IEEE meetings to expand the list of "known" terminations. I should state that the compilation only represents what I have been able to identify, as 802.3 places no requirements, except pin to GND isolation, designers are free to do what ever they want and probably anything you can imagine shipped at some point in time. With that said, all terminations except for A (which may have also been used, but less so) are the terminations found on various 100BASE-T ports. As to shorting the pairs together, one termination technique that I have not included, but probably should have, is the 1000BASE-T, which basically shorts the two wires of the pairs together (at least from DC point of view.) I have copied the DTE study group on my reply because, while we are not going to encourage proprietary systems, I feel it is important the group know what is going on out there. Also, while the two plus year schedule for producing a standard may not fit in your time frame, I would encourage you to follow what we are doing so that you stand at least a chance of still calling your equipment "802.3 Ethernet" once the standard is finished. "Mike White" <mikewhite99@xxxxxxxx> on 02/02/2000 07:19:16 PM Sent by: "Mike White" <mikewhite99@xxxxxxxx> To: Mike S McCormack/US/3Com cc: Subject: DTE Problem Set Hi Mike, I'm with a company called VitalCom that specializes in medical telemetry systems within hopitals. We are developing a proprietary system that we will interconnect via Ethernet and are planning on using power distributed over UTP. I happened across the IEEE working group studying this same problem. There is large amount of pertinent information there. Unfortunatly we are going to have to release within 6 months and it doesn't look like the group is far enough along for us to use a proposed standard. We are planning on putting VCC on the 4-5 pair and return on the 7-8 pair. I was going through your "DTE Power Problem Set and Solution Methodology" slide set dated Nov 1999. Can you tell me what equipment or who uses the Bob Smith termination shown in slide Termination Type B and the one in Type C? I was considering shorting the pairs ends together and was wondering what the precedent is out there for doing this, especially in the Ethernet world. Thanks for any help that you can give me. I can be contacted at: mike_white@xxxxxxxxxxxx 800-955-2424 x4106 http://www.vitalcom.com
Hi Mike,
I'm with a company called VitalCom that specializes in medical
telemetry systems within hopitals.
We are developing a proprietary system that we will
interconnect via Ethernet and are planning on using power distributed over
UTP.
I happened across the IEEE working group studying this same
problem. There is large amount of pertinent information there. Unfortunatly we
are going to have to release within 6 months and it doesn't look like the group
is far enough along for us to use a proposed standard.
We are planning on putting VCC on the 4-5 pair and return on
the 7-8 pair. I was going through your "DTE Power Problem Set and Solution
Methodology" slide set dated Nov 1999.
Can you tell me what equipment or who uses the Bob Smith
termination shown in slide Termination Type B and the one in Type
C?
I was considering shorting the pairs ends together and was
wondering what the precedent is out there for doing this, especially in the
Ethernet world.
Thanks for any help that you can give me.
I can be contacted at:
800-955-2424 x4106
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