How Circuit-Switched Digital
ISDN(Integrated Services Digital
The ISDN (ISDN, Integrated Services Digital Network,
synthesis digital network service) is the digital line
network which packet transmission / circuit switching data
communication digitized to a switchboard / trunk /
member line entirely can use.
● The network which I
connect a certain
computer or a printer
with a twisted pair
cable and a coaxial
cable, optical fiber in
the same building,
and exchange data.
● In the standard protocol
used by the Internet, it
hits OSI reference
model's transport layer.
IP in the network layer
and the protocol more
than the session layer
Internet Protocol address distinguishes a side near the
network part and LSB (least significant bit) as a host part
with a side near MSB (most significant bit). The network
part specifies the network, and the host part specifies the
equipment in the network. The subnet mask is used for
the distinction between the network part and the host
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