RE: [SI-LIST] : Ethernet RJ-45 connectors

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From: Larry Miller (ldmiller@nortelnetworks.com)
Date: Wed Jul 05 2000 - 13:44:43 PDT


I learn something new every day. Well, almost every day.

Thanks, Doug.

Larry Miller

> -----Original Message-----
> From: Doug McKean [SMTP:dmckean@corp.auspex.com]
> Sent: Wednesday, July 05, 2000 12:05 PM
> To: SI - List Discussion Group
> Subject: Re: [SI-LIST] : Ethernet RJ-45 connectors
>
> Jan Vercammen wrote:
> >
> > -4- one category 5 RJ-45 connector drawing carried the following
> statement: "jack
> > cavitiy conforms to FCC rules and regulations, part 68 subpart F". I
> assume that
> > this is related to safety and isolation voltages?
>
> I'll just footnote Larry's excellent comments
> with a couple of comments.
>
> FCC Part 68 deals with connection to the telephone line.
> An RJ-45 connector can provide that. If you are using the
> RJ-45s for strictly Ethernet, you've nothing to worry about
> from Part 68. That note is when the connectors are used
> for telephone purposes.
>
> In regards to safety and isolation voltages, yes you
> are correct. The "spirit" of the Part 68 is to protect
> the line AND the user in terms of catastrophic failure.
>
> It protects the line from attached equipment whereby
> some catastrophic failure primary voltages inside the
> device are crossed over to the telephone line.
>
> It protects the user the other way round. A catastrophic
> failure in this sense is also a a crossed line condition.
> A car could knock down a pole causing street power to
> cross over to the telephone line and thus the user.
>
> - Doug
>
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