Access router – ADTRAN Atlas 550 User Manual
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Chapter 1. Introduction
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ATLAS 550 User Manual
61200305L1-1
Access Router
As an Access Router, the ATLAS 550 combines the functions of a T1 CSU/
DSU, an intelligent channel bank, a T1 Multiplexer, and DACS into a single
platform. The ATLAS 550 is ideal for point-to-point configurations or access
to public networks. For optimization of existing equipment and network re-
sources, the ATLAS 550 can support a variety of data and analog voice ap-
plications (see Figure 1-1 ). The Access Router also supports a wide range of
data applications including T1 “drop and insert,” channel grooming, and
wide area data transport.
Figure 1-1. Point-to-Point Circuit with External Routers
Frame Relay/Router
The Frame Relay/Router features enable the Access Router to act as a voice/
data FRAD, a frame relay switch, and an IP router in addition to acting as an
available bandwidth manager and a switch application.
Frame Relay
Frame relay is a packet-switched service that allows efficient transfer of
bursty traffic in a WAN environment. It offers lower-cost data transfer
when compared to typical point-to-point applications. Using virtual con-
nections within the frame relay network and combining those into a single
physical connection at each location result in lower cost. Frame relay pro-
viders use a frame relay switch to route the data on each virtual circuit to
the appropriate destination. Figures 1-1 and 1-2 illustrate a conversion from
a typical point-to-point application to a frame relay application.
Router
Router
Router
Router
PBX
PBX
PBX
Frac T1
Frac T1
Frac T1
POWER
REMOTE
ERROR
TEST
OK
TEST
ONLINE
STATUS
ERROR
TEST
OK
CRAFT
ACO
ALARM
ALARM
1
2
NETWORK
1
2
3
4
MODULES
SYSTEM
ETHERNET
ATLAS 550
ATLAS 550 using
an external router.
TSU 100e
TSU 100e
TSU 100e