why haven't ethernet connectors changed?
Justin M. Streiner
streiner at cluebyfour.org
Thu Dec 20 23:38:43 UTC 2012
On Thu, 20 Dec 2012, Michael Thomas wrote:
> I was looking at a Raspberry Pi board and was struck with how large the
> connector is in comparison to the board as a whole. It strikes me: ethernet
> connectors haven't changed that I'm aware in pretty much 25 years. Every
> cable has changed several times in that time frame. I imaging that if anybody
> cared, ethernet cables could be many times smaller. Looking at wiring
> etc, it seems like it might be a big win for density too.
I've you've ever seen a truly 'dense' wiring closet, they are plenty dense
already - dense enough that unplugging a single patch cable in a rack
jammed full of switches is already a bit of a chore.
> So why, oh why, nanog the omniscient do we still use rj45's?
Inertia, for one thing. By that, I mean:
1. There hasn't been any real incentive to make the connectors smaller.
2. The installed base of copper Ethernet ports dwarfs pretty much anything
except maybe POTS lines, and even there, different countries sometimes
adopted their own standards. The costs of having to make physical changes
to even a small portion of the installed cable plant would be
There could also be some valid technical reasons:
1. The conductors really can't get any thinner. In fact, with Cat6A,
they're somewhat thicker than Cat5E.
2. I would also think that the conductors/pins really can't get much
closer together inside the connector shell, without cross-talk becoming
more of a problem. I don't have any technical data to back this up at the
moment, but it seems reasonable.
3. If assertions 1 and 2 are true, then the cable really can't get any
thinner either. Again, if you look at Cat6A cable (especially shielded
Cat6A), it is significantly thicker than Cat5E.
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