mailing list archives
Re: Common operational misconceptions
From: Jimmy Hess <mysidia () gmail com>
Date: Mon, 20 Feb 2012 20:07:20 -0600
On Sat, Feb 18, 2012 at 1:19 AM, Bob Vaughan <techie () w6yx stanford edu> wrote:
"Ethernet/Token Ring/Cisco Console/whatever uses an RJ45 connector"
RJ45 defines a keyed 8P8C type connector, wired in a specific
manner, for a specific 2 wire telco service. Incompatible with the
above on several levels. "RJxx" == specific connector/wiring pattern
for specific telco applications. Non-telco uses need not apply.
RJ45 is really an example of what was originally a misconception
became so widespread, so universal, that reality has actually shifted
so the misconception became reality. When was the last time you ever
heard anyone say "8P8C connector?"
Joe public caught on to "RJ45", so now that word means something
different in common usage than what it was specified to be. When
was the last time you heard someone say 8P8C connector in reference to
Nowadays it is technically ambiguous to say "RJ45"; are you talking about
[a] The original standard, Registered Jack 45, which was a specific
connector together with a specific pinout (which is not Ethernet
over UTP)? Usage of the connector is exceedingly rare, and will
hardly ever be referred to.
[b] "Ethernet" connector; The generic 8P8C connector (which has a
certain resemblance to RJ 45) is specified for use with TIA/EIA 568
compliant cable termination ?
Now instead of [a] being correct and [b] being always the
misconception..... [b] is "correct" in common usage.
And you have to decide based on context of the conversation which
defintion of RJ45 is intended, but [b] will almost always be the
Re: Common operational misconceptions Keegan Holley (Feb 16)
Re: Common operational misconceptions Octavio Alvarez (Feb 20)
Re: Common operational misconceptions nanog (Feb 21)
Re: Common operational misconceptions Scott Weeks (Feb 17)
Re: Common operational misconceptions Bob Vaughan (Feb 18)