When I went to change out this SM, it turned out to be an old former Trango
customer from about 14 years ago that we never changed the POE, and it was
in fact a transformer.
Do you think when the power came back on an overvoltage condition propagated
to the SM and fried something? Or just starved it of voltage and made the
flash memory forget stuff?
BTW while I was out there I put in a new POE and also changed out the board
in the 300SS (we stopped using those around 10 years ago) with one of
Chuck's gas tube replacement boards.
From: AF <af-boun...@af.afmug.com> On Behalf Of Bill Prince
Sent: Thursday, October 31, 2019 1:08 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] 450 SM lost config, feature key, and radio calibration
I've seen SMs do all kinds of crazy things during a brown out. It happened
more when the power bricks were simple transformers, as the voltage sag
would get through to the SM. They would reset to factory default,
uncalibrated. So yeah.
bp
<part15sbs{at}gmail{dot}com>
On 10/31/2019 11:01 AM, Ken Hohhof wrote:
Has anyone experienced a Cambium SM losing not just the radio calibration
data but the config and also reverting to 4 Mbps aggregate (it was bought as
a 20 Mbps unit, this wasn't even an upgrade key, although I suspect they all
start as 4 Mbps units and the factory squirts a feature key into them)?
This happened when a customer had a power outage, we had installed a new SM
about a week before.
Cambium Support is wanting a remote session so they can telnet in and
restore the radio calibration data. I am thinking there's a bigger problem
than the calibration data, since it lost its config and went back to factory
defaults, and also went from 20 Mbps to 4 Mbps.
We also several concerning log entries including "MPU violation occurred in
this build. MPU is disabled until next upgrade/downgrade" and stuff like
fatal error, illegal instruction and register out of range.
I'm thinking I should just bite the bullet and throw this SM away, although
it's a 3.65 SM so it wasn't cheap.
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