nanog mailing list archives
Re: why haven't ethernet connectors changed?
From: eric clark <cabenth () gmail com>
Date: Fri, 21 Dec 2012 07:34:09 -0800
You didn't include RJ11 in your question.... it goes back further. One reason is that as we push the limits of cable from CAT3 (10meg) to CAT5 (100meg) to 5E (gig) to 6 (not sure what that was for) to 7 (10gig), the cable doesn't get any smaller. We're dealing with higher and higher frequencies of changes on the wire. This makes cross talk and interference a bigger problem, so the twists and insulation are more important to try to protect from those issues (sometimes shielding). So the cable hasn't gotten any smaller. The connector works well enough and allows for these distances to be maintained. Some vendors have found ways to maintain the twists farther into the RJ45 by essentially using traces and not just lining the 8 wires up in parallel but stacking them in a staggered fashion... Obviously, a new connector could have been found, but why haven't we changed the C13 that HP came up with (at least I think they did) back in the 50s? Its still the defacto standard for all computer input power. As a matter of fact, most NEMA specs haven't changed since they were created... If it ain't broke, don't fix it. The only problem with the RJ45 is the hook. E On Fri, Dec 21, 2012 at 7:15 AM, Brielle Bruns <bruns () 2mbit com> wrote:
Some of us still have a stock of legacy gear and cables - things like v35 cables for connecting to CSU/DSUs, and even the occasional AUI hub. :) You wouldn't believe how much people will pay for legacy computer gear when they need it to keep their business going. -- Brielle Sent from my iPhone On Dec 21, 2012, at 7:57 AM, Matthew Black <Matthew.Black () csulb edu> wrote:http://www.blackbox.com/Store/Detail.aspx/Ethernet-Transceiver-Cable-Office-Environment-PVC-IEEE-802-3-Right-Angle-Connector-3-ft-0-9-m/LCN216%C4%820003Only $55.95 for a 3-foot transceiver cable. What was more surprising isthat Black Box is still around.matthew black california state university, long beach -----Original Message----- From: Michael Thomas [mailto:mike () mtcc com] Sent: Thursday, December 20, 2012 10:20 AM To: NANOG list Subject: why haven't ethernet connectors changed? I was looking at a Raspberry Pi board and was struck with how large theethernetconnector is in comparison to the board as a whole. It strikes me:ethernetconnectors haven't changed that I'm aware in pretty much 25 years. Everyothercable has changed several times in that time frame. I imaging that ifanybodycared, ethernet cables could be many times smaller. Looking at wiringclosets,etc, it seems like it might be a big win for density too. So why, oh why, nanog the omniscient do we still use rj45's? Mike
Current thread:
- Re: why haven't ethernet connectors changed?, (continued)
- Re: why haven't ethernet connectors changed? William Herrin (Dec 20)
- Re: why haven't ethernet connectors changed? Michael Thomas (Dec 20)
- Re: why haven't ethernet connectors changed? Lyndon Nerenberg (Dec 20)
- Re: why haven't ethernet connectors changed? William Herrin (Dec 20)
- Re: why haven't ethernet connectors changed? William Herrin (Dec 20)
- Re: why haven't ethernet connectors changed? Michael Thomas (Dec 20)
- Re: why haven't ethernet connectors changed? Justin M. Streiner (Dec 20)
- Re: why haven't ethernet connectors changed? Deepak Jain (Dec 20)
- RE: why haven't ethernet connectors changed? Matthew Black (Dec 21)
- RE: why haven't ethernet connectors changed? Matthew Black (Dec 21)
- Re: why haven't ethernet connectors changed? Brielle Bruns (Dec 21)
- Re: why haven't ethernet connectors changed? eric clark (Dec 21)
- Re: why haven't ethernet connectors changed? William Herrin (Dec 21)
- RE: why haven't ethernet connectors changed? (Ramdom thoughts) Brandt, Ralph (Dec 21)
- RE: why haven't ethernet connectors changed? Matthew Black (Dec 21)