It would be a good idea, as this is part of the standard..
> >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.
>
> 96/4 = 24 per PRI... Don't they need at lease *one* D channel? ;-)
Basically each PRI needs a 32K D channel to handle it's capacity, but since
64K is the channel size it has more capacity than it needs. So the spec on
PRI's states that the first PRI needs to be 23B+D and the second can be 24B,
or some even use 23B+backup-D. So when you look at this the odd numbered
PRI's should be 23B+D (ie: 1,3,5), and the even numbered PRI's should be
24B (ie: 2,4,6).
You can use all 23B+D PRI's if desired, but then you are just wasting the
excess D channel capacity unless you also use the D for some type of packet
based service that is based on D channel transport.
Actually your PM3 is quite optimum for this, as each two PRI's can use the
same D channel, and suprise each PM3 supports exactly 2 PRI's.. :-)
> >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..
>
> Probably, you can populate the unit anywhere from 8 to 60 modems.
I guess if someone was interested in only delivering analog connectivity
based on digital modem technology having 48 (or 60 if E1) available modems
would be the only way to go. If you have any ISDN usage at all (which we do
here in Baltimore), you really wouldn't need a 1 to 1 modem to B channel ratio.
> -MZ
-------------------------------------------------------------------------------
Internet : howardl@abs.net | Howard D. Leadmon
UUCP : wb3ffv!howardl | ABSnet Internet Services
PHONE : (410)-361-8160 | 200 E. Lexington Street
FAX : (410)-361-8162 | Suite-1602
PACKET : WB3FFV @ WB3FFV.MD.USA.NA | Baltimore, MD 21202
WWW : http://www.abs.net |