You can get gige ( 1 GHz) on UTP (cat 6E) but only 10 MHz on coax. Coax may be daisy chained (party line) while all UTP goes through a hub. In other words it's bus archtechure vrs direct connect.
Fred Townsend DC to Light Ken Javor wrote: That sounds like an excellent suggestion to me. It does raise one unrelated question in my mind, because I know little about Ethernet. This is just for my own understanding, it doesn't bear on the original post. Why is it you can get 100 MHz on "phone-line" type Ethernet cable, but only 10 MHz when on coax? Seems like it ought to be just the reverse. From: [email protected] List-Post: [email protected] Date: Wed, 30 Aug 2006 20:23:52 -0500 To: [email protected] Cc: [email protected] Subject: Re: Chamber transition panels Hello Gary, May I suggest going to older Ethernet hardware? There are 10BaseT to 10Base2 Ethernet adapters. You may have to look in a computer resale shop to find this older hardware. This will get you to the older 50 ohm coaxial Ethernet connection. You should have no trouble getting the coax through the wall. You will be limited to 10 megabits/second, but that may be sufficient. Ted Eckert American Power Conversion Corporation The items contained in this e-mail reflect the personal opinions of the writer and are only provided for the assistance of the reader. The writer is not speaking in an official capacity for APC nor representing APC's official position on any matter. "McInturff Gary" <mailto:[email protected]> <GMcInturff@spray cool.com> To Sent by: <mailto:[email protected]> <[email protected]> [email protected] cc Subject 08/30/2006 01:52 Chamber transition panels PM Dumb question maybe I have to get a UTP Ethernet connection out of a semi-anechoic chamber. There no anti-chamber so any unfiltered cable routing opening is a major leak because of the opening and the induced noise on the cable itself. Since Ethernet signals don¹t like to be filtered. I¹m considering two options neither of them make me real happy. 1) Find, if one exists, some sort of metallic RJ-45 bulkhead transition connectors and mount that into the transition panel. I¹ve seen the plastic versions for inter-connecting Ethernet cables, but the were neither metallic nor bulkhead mounted. 2) Make an air dielectric waveguide out of foot or so 1Ž2 inch metal pipe and attach that to the transition panel and route the cable through the ³wave guide² The opening itself even at 1Ž2 is larger than 18 GHz upper test frequency, but the width of the wave guide buys me some attenuation and I don¹t expect to see much in the way of ambient up that high anyway. I don¹t have an option of putting the test gear into the chamber with the EUT. The test gear would be a worse problem. I don¹t think this is completely brain dead but don¹t see any easier solution, but this doesn¹t address any induced ambient noise on the cable. Your thoughts? Thanks Gary - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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