Interesting Apple ][ card

From: Tothwolf <>
Date: Fri Jul 12 12:11:00 2002

On Thu, 11 Jul 2002, Eric Smith wrote:

> Strange, a 10baseT/100baseT Ethernet interface should be able
> withstand telephone voltages (even ringing), even if the jack has them
> wired to the data pairs. Even if it sustained damage, there should
> not have been any sparks.

Many of those commercial/digital phone systems often have 24VAC or
something similar available to power the phone on one of the pairs. Most
of them also have quite a bit of current available. I've seen a few cable
pair testers loose their magic smoke due to those types of phone systems.

Received on Fri Jul 12 2002 - 12:11:00 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:35:01 BST