2) A livingston OR-U office ISDN router connected to
a livingston PM2 Access Server with a dual asynch
ISDN (128k) between them.
If I have the following 2 scenarios, which one allows the most
true throughput for end users (meaning it allows the most end
users with no perceived delays in traffic in/out):
Cost is not the specific issue -- design for support of
the end users is the primary focus in this application.
128k async would have better throughput than 56k sync, assuming no
performance problems in the routers (how many other users is your PM2 going
to have?) However, can you get 128k async? Async ISDN tends to be either
V.110 (max speed 38400, I think) or V.120 (additional protocol overhead.)
(Are you sure that the Livingston is doing async? I'd think isdn-isdn
connections between two router-type boxes would be sync isdn.)
128k sync using "bonding" sync ISDN terminal adaptors (maybe with
compression) would make them awfully even (ie replace CSU/DSU devices in
the cisco DDS case with the sync TAs...)
BillW
cisco