1. How Circuit-Switched Digital
Networks Work
● Central office switches
● Dial-up router
● Telephone company's work
● The high-speed intraswitch

2. Central office switches
● Central office
switches are sending
data each equipments
and take data by
these. And these data
is handled by Central
office switches.

3. Dial-up router
● The dial-up router
recognizedata with
adestination outside
the LAN and initiales
a call to desitination
selected from a
preprogrammed table

4. Tlephone company's work
● This is a
computerized switch
that works with other
similar switches to
route and complete a
call.

5. The high-speed intraswitch
● There is a high-speed
intraswitch trunk
which enable to do a
fiber-optic link
operating at a
minimum of 45
megabits per second.

6. References
●PCLIFE
http://www.net.santec.co.jp/catalog/SC-RS51GH/
●NTT
http://www.ntt.co.jp/
●MAXIM
http://www.maximic.com/solutions/telecom_switches/i
●Hp
http://h50146.www5.hp.com/products/servers/bladesy
●