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114069 Rev. A
1-1
Chapter 1
SMDS Overview
Switched Multimegabit Data Service (SMDS) is a public, high-speed,
packet-switched network service that enables you to connect local area networks
(LANs) across wide area networks (WANs). SMDS technology combines cell
relay technology and IEEE Standard 802.6, the link control protocol standard that
controls cell transmission. To send information across the network, SMDS divides
data into fixed 53-byte cells. The use of cell technology makes SMDS well suited
for traffic that consumes high bandwidth for short periods of time.
Figure
1-1 illustrates an SMDS network. In this illustration, LAN 1 communicates
to LAN 2 and 3 through a router connected to an SMDS Digital Service Unit/
Channel Service Unit (DSU/CSU). The DSU/CSU changes the frame-based data
from the router into cells that can then be sent across the SMDS network.
Figure 1-1. SMDS Sample Network
Router
DSU/
CSU
Router
DSU/
CSU
LAN 1
LAN 3
SNI
SMDS
Network
T3
T3
T3
SMDS
Switch
LAN 2
SNI
SNI
Router
DSU/
CSU
SMS0001A
SMDS
Switch
SMDS
Switch
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