PSTN Hierarchy cont.
nLocal
(example, within Espoo)
nSubscriber
connections
nSwitching
within the local exchange
nSwitching
to other exchanges
nTransit
(within Finland, say between Tampere and Helsinki)
nSwitching traffic between different geographical areas within one
country
nInternational
nGateway-type
traffic between
ndifferent
countries
ndifferent
operators