[Asterisk-Users] Sangoma VS. Digium

[David Brodbeck]

> -----Original Message-----
> From: Rich Adamson [mailto:radamson at routers.com]

> Its an odd thing. Some people have to reload, others don't, and there
> has been no effort to determine why it occurs. I've got two systems
> that do have to be reloaded regularly. Go figure.

These kinds of erratic interoperability problems often speak to a marginal
design.  If you're a little short on filtering, or your signal levels aren't
quite right, or something like that, it's easy to end up in a situation
where your product will work great under optimal conditions, but fail
erratically out in the field.  It's often tempting to blame these failures
on the design of other equipment (e.g., motherboards), or on power quality,
or on things like that, but those are really just excuses for not providing
a more robust product.  Whenever I see a product that needs a lengthy
"compatibility list" of motherboards that will and will not work with it, I
get suspicious that someone is pushing the specs a bit.

A simple example of this kind of thing that I'm familiar with is RS-232.  As
a hobbyist, I've put together various RS-232 interfaces.  The RS-232 spec is
something like -5 to -15V for a 1, and +5 to +15V for a 0.  If you wire up a
circult that uses 0V for a 1, and +5V for a 0, you eliminate the need for
two power supply voltages, and it'll work great -- with about half the
serial ports out there.  On the other half, it'll fail miserably.