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Doesn't this quoted text say that the patch panel PC board must handle,
for example 0.75 amps at a 60 degree C ambient?
If so, that implies to me that it must handle the 175ma.
It would seem to be against the laws of nature to have a trace that fails due to
a current that is too low, right?
Am I missing your point?
Maybe you are saying that the TR-42 letter doesn't actually say the PC board traces themselves
can handle 0.75 amps at 60 degree C, but rather the just connector?
The point is: what continuous current can the cable plant handle as a system reliably?
- Rick
-----Original Message-----
From: Jack Andresen [SMTP:jandresen@etslan.com]
Sent: Tuesday, May 08, 2001 1:42 PM
To: Brooks, Rick [SC5:321:EXCH]
Cc: stds-802-3-pwrviamdi@ieee.org
Subject: Re: Potential heating problem
Rick,
I'm not sure I agree with what you said.
Quote "where it stated:
PCB:
* CEI IEC 60603-7: current capacity for connectors @20 °C - 1.8 A (@ 0
°C
-2.2
A, @ 40 °C - 1.4 A, @ 60 °C - .75 A)
which implies that compliant patch panels will not have a problem with
350ma, "unquote
How does a connector spec that allows almost 10 times our requirement
(1.4A at 40 degreeC vs .175A at the same temperature) imply no problem?
Jack Andresen
Rick Brooks wrote:
>
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