Specifications

Chapter A Networking Concepts
WAN Technologies
A-4
Cisco 1700 Series Router Software Configuration Guide
78-5407-03
Figure 0-1 Sample ISDN Network
Frame Relay
Frame Relay is a method of packet-switching that is used for communication
between user devices (such as routers, bridges, and host machines) and network
devices (such as switching nodes and modems). User devices are called data
terminal equipment (DTE), and network devices are called data
circuit-terminating equipment (DCE).
Frame Relay services can be provided by either a public network or a network of
privately owned equipment serving a single enterprise.
Frame Relay is a streamlined, efficient, high-performance protocol. It is
extremely fast because
• It multiplexes many logical data conversations (or virtual circuits) over one
physical link. Multiplexing provides flexible and efficient use of bandwidth.
T
NT2
S
TA
ISDN
switch
NT1
U
NT1
U
T
NT2
S
R
NT1
U
T
NT2
S
TE2 device
(
standard telephone)
TE1 device
(ISDN telephone)
TE1 device
(computer)
ISDN
switch
Packet
network
Switched
network
Private-line
network
S1307a