9
Connecting into PSTN exchange: Equipment in the access network
ISDN connection
example: 30B+D
(2.048 Mb/s)
Twisted pair - connection
Private Branch Exchange
Multiplexer
On-line subscriber
with several telephones
Business
subscriber
Wireless
access
(or radio access
point)
Distribution point
Cross connection point
ISDN 2B+D
144 kb/s
Q.512 specifies
exchange interfaces