>
> Not an expert but I suspect designing standards which would ensure every single device would work with every single other device
under all conditions is very difficult, if possible, and likely to be very expensive. You might be able to test a device with every
other device but this is likely to cost way too much and you haven't considered different conditions. Of course, I'm not saying the
standards can't be better, perhaps they can...
>
> Coincidentally, I was reading the Jan Telepermit newsletter yesterday and it address this issue and indeed Steve is quite right
> http://www.telepermit.co.nz/nl146.html#sec3
>
> Why not quite relevant to this topic, I think this quote sums it up:
>
> "Ideally, every modem would provide identical performance, but this simply does not happen and differences in performance can
certainly be expected if a $100 modem is compared directly with a $500 modem.
>
> Above all, most modem suppliers would consider Telecom unreasonable if we were to grant permission to connect only the top
performing modem types, especially when the majority of our lines are of only 2 km or less from our exchanges."

Someone mentioned something about not interfering with other equipment.
Having two pieces of equipment compatible is not to say that they are the
best possible combination. A phone is not good if one cannot hear what the
other party is saying. If something is interfering with that phone then that does
mean that something is not operating in a way as to not interfere with other
equipment.

It is not about testing a device with every other device - it is about operating
a device within specific parameters which mean that they will work with other
devices - not as interconnected devices which need each other - but as independent
devices connected to the same network.

Chrissy.

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