Re: Potential heating problem with standard patch Cat5 panels

[Sterling Vaden <savaden@xxxxxxx>]

The maximum operating temperature for FR-4 is 130 degrees C (266 F). (may
not be suitable for continuous operation). Boards routinely reach 200 C
and above during the soldering operation.

Sterling Vaden

Rick Brooks wrote:

 

From my personal experience, a 12 degree C rise is trivial and would not cause any
PC board discoloration, unless the PC board was operated above 100 degree C.
Or the PC board material is faulty. I wonder if it is FR4.

If the patch panels are being damaged, there must be a whole lot more current involved than 350ma,
or the traces are very thin, or it has a different cause.

- Rick
 

-----Original Message-----
From:   Jack Andresen [SMTP:jandresen@xxxxxxxxxx]
Sent:   Thursday, May 03, 2001 2:21 PM
To:     stds-802-3-pwrviamdi@xxxxxxxx
Subject:        Potential heating problem with standard patch Cat5 panels

A customer mentioned  panels burning up when one of his customers senr
power down the network.. I did some canculations and found a potential
problem.

Jack Andresen << File: DTE power.doc >>