The document discusses how circuit-switched digital networks work. It describes key components like the central office switch, which enables temporary connections between two members. It also discusses dial-up routers, which provide internet access and connect local area networks. High-speed intraswitch trunks allow edge devices to communicate through trunk switches. The document also mentions that TCP/IP protocols are commonly used on the internet and cover data link, network, and transport layers.

1. How Circuit-Switched Digital
Networks Work
● Central Office Switch
● Dial-up router
● High-speed
intraswitch trunk
● TCP/IP ● S1170075 Kanto Nakayama
● S1170077 Haruka Hashimot
● S1170081 Youta Matsuzaki
● S1170086 Makoto Yoshizawa

2. Central Office Switch
● Central office switch is a
name for network
elements of the PSTN to
enable temporary
connection among two
members.
● This has the switch of
some kinds.
● And those switches
largely evolved the latter
period later in 1800s.

3. Dial-up router
● The dial-up router has two
functions that access the
Internet service provider and
connect to LAN.
● It can make some computers
to connect to Internet at the
same time without special
setting.

4. High-speed intraswitch trunk
● A trunk switch of a
trunk cluster for
connecting a plurality
of edge devices to
each other, where
each edge device can
communicate with all
the other edge
devices through all of
the trunk switches.

5. TCP/IP
● The TCP/IP is protocol and
used normally in the Internet
and Intranet.
● Because it was implemented
by default by UNIX, it spreads
rapidly and spreads most
now in the world.
● The TCP/IP covers the part of
the data link layer of the OSI
Reference Model, network
layer, transport layer.

6. References
● Hill Associates Wiki
http://www.hill2dot0.com/wiki/index.php?title=Main_Page
● E-Words
http://e-words.jp/
● Freepatentsonline
http://www.freepatentsonline.com/
● Hatena keyword
http://d.hatena.ne.jp/keyword/