Re: Booting PC disconnects ADSL Modem
- From: w_tom <w_tom1@xxxxxxx>
- Date: Wed, 31 Oct 2007 23:50:12 -0700
Part of a long list of reasons for a dropped ADSL include ground
loops created by building AC electric. Assumed: you know all machines
have proper safety ground connections (so as to eliminate floating or
ground loop problems).
Time of the event (as Windows loads drivers into NIC) implies
grounds are not a problem. I can only assume all are 100 Mhz Ethernet
connections and that all wires are known properly constructed (a
problem that sometimes occurs when connectors are attached to wires
'in the field'). The suspect NIC works just fine at 100 Mhz (not 10
Mhz)?
Identical systems means all have NICs from the same manufacturer.
We don't know if the problem is Windows or hardware. Diagnostics will
break that unknown into parts to solve it. Find the NIC
manufacturer's diagnostic for that Ethernet chip. This diagnostic
will load and execute without Windows. Now what happens to the ADSL
connection when NIC diagnostic loads and executes?
The diagnostics have one even better feature - the last (optional)
test is a worst case data test. This is a worthy test of network
stability and ethernet hardware. Setup the diagnostic on the other
machine as a diagnostic server (mirror, echo, whatever they call it).
Software is executing hardware without any Windows. Setup the
optional last test on the suspect machine to output data
continuously. The mirror server will echo worst case data patterns
back to the suspect machine via the router. It should have no affect
on the ADSL connection.
If true, then hardware is eliminated as a reason for failure. Now
move on to another suspect - Windows.
Setup the Ethernet post as disabled (from Control Panel, Device
Manager, or Network Connections). Then reboot the machine. Does this
eliminate ADSL interference?
In the meantime, confirm the suspect computer's safety ground
actually exists. Both safety ground inside walls AND safety ground
connection inside machine. If not, then ADSL interference was created
by two problems - a missing safety ground AND a galvanic isolation
failure in the suspect computer's NIC interface. Based upon new
information, I don't expect this ground problem to exist. However, it
is a simple possibility to eliminate.
On Oct 30, 10:23 pm, Marts <marts...@xxxxxxxxxxxx> wrote:
It occurs as Windows XP SP2 is loading when the "splash screen" I think
that it's called is still being displayed.
PC is connected via standard ethernet cable directly to the ADSL modem's
ethernet switch, in the same way as the other PCs are.
All PCs have Asus motherboards with built in NICs. All are configured
identically, except for individual machine IP addresses, which are static. No
DHCP is enabled
Dunno what the power cord has to do with anything, but it's plugged into the
wall and is on the same phase as the other GPOs in the house.
What other information do you need in order to point me in the right direction
on this?
.
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