LAN construction example
Gigabit Ethernet
(1Gbps)
Switch
Switch
Fast Ethernet
(100Mbps)
Switching hub
Switching hub
Switching hub
Switching hub
Repeater hub
Repeater hub
Server
Chapter 9
Ethernet
(10Mbps)
Server
(4)Network communication lines
The types of equipment needed to perform data communication over a
communication line are summarized below.
Type of comEquipment needed
munication line
Role of equipment
Analog line
Modem
(Modulation and
demodulation device)
Provide conversion of digital signals and
analog signals.
ISDN
DSU
(Line terminating
device)
Provide conversion for digital signal formats from computers and digital signal
formats over the network, and a terminal
connection for the digital line.
TA
(Terminal Adapter)
Provide conversion for ISDN digital signals
and other signals such as analog signals.
Many terminal adapters have a built-in
DSU.
ADSL
FTTH
Reference
DSU
Technology element
*Circles indicate the area of the transmission speed.
Abbreviation for “Digital Service Unit.”
Reference
Dial-up router
A router that is equipped with TA, DSU, or
hub functions. Generally used to provide
an Internet connection using an ISDN line
for multiple computers on a LAN.
ADSL modem
Provides conversion of ADSL analog signals and digital signals. The connection
port on the computer can use an Ethernet
or USB interface.
Splitter
Separates the bandwidth used for voice
signals and data signals.
Media converter
Provides conversion for optical signals
and electric signals.
TA
Abbreviation for “Terminal Adapter.”
Reference
PBX
“PBX” is a piece of equipment that provides a private telephone exchange for
extension phone use. The PBX connects to a phone line to enable a corporation or other organization to build an
extension phone network within a restricted area.
Abbreviation for “Private Branch eXchange.”
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