[SGVLUG] Bad Ethernet patch cable, but passed a DC cable tester

[John Kreznar]

In a posting purporting to be from Scott Packard <spackard at gmail.com>
but lacking a cryptographic signature, it is written

> I wrapped up the old one and brought it home to test it was a DC-based
> tester (a Testifier by Test-Um) and all 8 wires pass.  So, I guess
> sometimes a DC-based tester won't tell you everything, ...

I'm reminded of the time back in the 60's when I had a problem with my
PDP-8 and tracked it down to a particular trace on a printed circuit
board.  The trace passed DC just fine, but the 100-ns pulse it was
supposed to carry was completely blocked.  I lived in Santa Monica at
the time, and the salt air had corroded the bare copper too thin.  A
simple solder job fixed the computer.

-- 
OpenPGP key: http://ininx.com
 John E. Kreznar jek at ininx.com 9F1148454619A5F08550 705961A47CC541AFEF13

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