Folks,
Allow me a few stupid basic questions about ISDN. I follow the
discussion on PM3 and find it very interesting, but it's only a
matter of future for me yet, since ISDN is not yet available in my
country, and sophisticated phone services are hard to get either.
o Having an ISDN PRI connection (via E1/T1 line from Telco), can I
also use it (now I don't ask for PM3 capabilities but for Telco
services) as a 30/24 normal phone lines (calls from analog modems) ?
Does this come automaticallly with ISDN or is it a special service ?
o Is a chanellized T1/E1 the same thing I would plug into my
PBX/dmultiplexor to convert to local phone lines ? Right now I use
E1-PBX-30 local llines-modem pool-PM2, if I could use just E1-PM3, it
would be considerably simpler and cheaper (PBX cost me $8000 - don't
ask me why I didn't get cheaper demultiplexor, other service just
wasn't available from my stupid Telco).
You need channelized T1/E1 to break-out ordinary lines.
Some systems (eg: Ascend 4000) support feature sets
called PRI-to-T1-conversion and T1-Drop-and-Insert.
These features let you break out individual channels
from a PRI that can be passed to your channelized-T1
compatible PBX. I don't think the PM3 supports this feature.
There are probably other gadgets that will do the same
thing.
o Is the purpose of "digital" modems inside PM3 to handle just
calls/communication from analog modems (up to 33.6k) ? ISDN doesn't
need any modems, right ? The function of these modems is converting
analog to digital information, right ? So the name "digital" just
refers to their implementation (DSP), not to their function, isn't it
so ?
Am I totally confused or not ? I would welcome if anyone correct my
understanding of this.
Your understanding of "digital modems" is correct
(unless I'm totally confused <g>).
Kyle Townsend
Honza Jirousek, Econnect
Prague, Czech Republic