HUT Comms Lab., Timo O. Korhonen
PSTN today summarized
nGets
still more subscribers!
nISDN
very popular in switches (in Finland all-digital exchanges)
nISDN
getting popular also for local loop access
nVersatile
access part
nConventional
local loop technology develops fast
nRemote
controlled O&M
nIN
services fully-developed - Intelligence moves to terminals
nFiber-optical
DWDM links connect exchanges
nCommon
channel signaling (SS7)
nSDH-based
(Synchronous Digital Hierarchy) trunk-networking