[SI-LIST] Ethernet switch burnout
- From: "Jan Vercammen" <jan.vercammen.jv1@xxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 1 Aug 2002 16:04:25 +0200
Hello SI-list,
I have an urgent question concerning Ethernet twisted pair. We have
received from the field three reports
that one of our products seems to have the capability to physically damage
the port of a switch to which it
is connected.
To be more specific: our device uses a Bob Smith termination. The RJ-45
unused pins are connected with
75ohm to a common-rail, which in turn is capcitively coupled (using 1nF) to
the chassis (=housing of device),
which is also connected to the logic ground of the PCB.
The center taps of both transmit and receive are also connected with 50ohm
to the same common rail.
The other port is a switching hub and I do not know if shielded or
unshielded cable was used.
What seems to happen is that after a while the communication hangs and the
port at the switch does not operate
anymore, not with our device or any other.
For now I cannot confirm that resetting the switch solves the problem and
it looks that there is hard damage.
I have heard of cable sheath discharges (the tubing of the cable charges
and next discharges to the environment,
damaging hardware). However, for now I would like to disregard such exotic
scenario.
So my questions are:
-1- as anyone encountered similar switch burnouts (whether hard or soft)?
-2- if so, what is the possible explanation and fix?
Kind regards,
Jan Vercammen
Agfa-Gevaert, Belgium
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