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Chapter 1. Introduction
1-2
ATLAS
_800
PLUS
User Manual 61200226L1-1
The modules include the following:
• Quad Nx 56/64 Module
• Quad T1/PRI Module
• Octal Basic Rate ISDN Module
• T3 Module
• Async-232 Module
• Modem-16 Module
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 connections within the frame
relay network and combining those into a single physical connection at each loca-
tion results in lower cost. Frame relay providers 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.
Figure 1-1. Point-to-Point Circuit
Router
Router
Router
Router
PBX
PBX
PBX
PBX
Frac T1
Frac T1
Frac T1
ATLAS 800
PLUS