
Block diagram of ISDN functions
Common
physical
interface
ISDN
central
office
Digital circuit -
switched backbone
Packet-switched
backbone
Network-based
processing
services
Subscriber loop to ISDN channel
structures: Basic = 64 kbps + 64
kbps + 16 kbps
Primary = multiplexed 64 kbps
channels
Integrated
Digital Network
Jamadagni H S DC/V1/2004 2
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