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Copyright © 1997 Cisco Systems, Inc.
6-3CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
WAN Devices
WAN Switch Switches traffic such as Frame Relay,
X.25, and SMDS, and operates at the
data link layer
Modem Interprets digital and analog signals,
enabling data transmission over
telephone lines
Access Server A concentration point for dial-in and
dial-out connections
CSU/DSU Adapts a terminal physical interface to a
switch interface in a switched-carrier
network
ISDN Terminal Connects ISDN Basic Rate Interface
(BRI) to other interfaces, such as
EIA/TIA-232
6-4CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
WAN Terminating Equipment
Modem
Data Terminal Equipment
DTE
Data Circuit-Terminating Equipment
The Service Providers The Service Providers
EquipmentEquipment
DCE
EIA/TIA-232
V.35
X.21
HSSI
To Corporate
Network
The Customer’s The Customer’s
EquipmentEquipment
WAN Provider
(Carrier) Network
Physical Cable Types
Usually on the
Customer’s
Premises
Router
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