Chapter 1. Introduction
61200305L1-1 ATLAS 550 User Manual 1-3
Figure 1-2. Frame Relay Circuit
Router
The ATLAS 550 router uses the Ethernet port to transmit local area network
(LAN) traffic over the wide area network (WAN) to a remote LAN. By inte-
grating the router into the network access device, you benefit from the cost
savings of not requiring an external router. Figure 1-1 and Figure 1-3 illus-
trate a conversion from an application with external routers to one using
integral routers within ADTRAN products.
Figure 1-3. Frame Relay Circuit with Internal Routers
Access Switch
The ATLAS 550 includes an advanced access architecture for switching
dialup calls to specific ports or DS0s. As an access switch functioning in
user-to-user network and user-to-user mode, ATLAS 550 consolidates
multiple basic rate ISDN (BRI) connections onto T1/PRI access lines.
Additionally, BRI-to-BRI, BRI-to-PRI, and PRI-to-PRI switching are
supported. The ATLAS 550 also converts between ISDN D channel (PRI or
Router
Router
Router
PBX
PBX
Frame
Relay
Router
PBX
P
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5
5
0
ATLAS 550
T1
Frac T1
Frac T1
Frac T1
TSU 100e
TSU 100e
TSU 100e
PBX
PBX
Frame
Relay
PBX
P
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R
R
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M
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ATLAS 550
ATLAS 550
T1
Frac T1
Frac T1
Frac T1
TSU 100e
w/ router module
L
A
N
PC
L
A
N
PC
L
A
N
PC
L
A
N
PC
TSU 100e
w/ router module
TSU 100e
w/ router module
