> That means ISPs can purchase a 2 PRI box fully loaded with 46 modems for
> $16,364 ($355 per port). The way I got to 46 modems was with 3 x 10 port
> cards, 2 x 8 port cards (remember each PRI is 23B + 1 D).
Actually I don;t know if your unit will support this or not, but when
dealing with multiple PRI lines you can order the first one as 23B+D and
then order the second as a 24B. This is the way ISDN (PRI) was designed
to be used as a 64K D channel was adequate for 2 PRI circuits. We had
an Northern Telecom PBX, and is was configured with 3 PRI lines, two of
which were 23B+D and one which was 24B so it will work as long as your
D channel handler knows what to do with this. Why do I bring this up,
since it gets us all an extra channel, and who wouldn't what that...
> A slightly more conventional way would be 6 x 8 port cards (two spares) for
> $16,861 total or $366.54 per port. 48 modems is also what you need for
> channellized T1.
Actually if you do any ISDN business at all (which we do), you would think
actually having say 4 10-port cards would be fine as you are sure to have
some ISDN users on at any given time. Heck look at Ascend, the 4-PRI box
they sell tops out at 72 digital modems, but 96 channels, so you have to
count on having some ISDN users online.
Don't get me wrong, the option of having a 100% supported modem (analog)
ratio is super, and I think this is the correct way to offer such a unit,
but practically I think you will have a lot of spares..
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