28 Jun
2023
28 Jun
'23
12:23 p.m.
On Jun 28, 2023, at 1:00 AM, Grant Taylor via cctalk
<cctalk(a)classiccmp.org> wrote:
Tony's email makes me ask more questions than I have (smart alack) answers to. Maybe
~> hopefully I can ~> will learn something.
On 6/27/23 10:26 PM, Tony Duell wrote:
Very definitely. The Ethernet spec gives a 50 meter limit for the AUI cable length, and
describes it as a controlled impedance cable with shielded twisted pairs. But I agree
with Tony that for short lengths a plain ribbon cable would do just fine. And
"short" I would define as "electrically short" -- much less than a
wavelength, so one meter is likely still ok if you need that much.
For a few inches, which would be enough here I
think, I've used an IDC DA15 plug and socket crimped onto the normal ribbon cable.
Technically it's wrong but the reflections on that length of cable won't matter.
Isn't 10Base<something> quite resilient? Especially at these distances? Though I don't know if AUI is considered
10Base<anything> in and of itself. Doesn't it become 10Base5 / 10Base2 /
10Base-T based on what transceiver is on the other side of / attached to the other end of
the AUI cable?
Correct. The AUI cable is defined for 10 Mb/s Ethernet, and the transceiver at the far
end attaches it to 10Base5 or 2 or T or even "broad" (Ethernet over cable TV).
paul