Figure B-1. Three Virtual Circuits In One Physical Circuit; Figure B-2. Frame Relay Network Using Virtual Circuits - ADTRAN Atlas 550 User Manual

Appendix B. OSI Model and Frame Relay Technology Overview
PVC Physical Connections
B-4
gotiation of the bandwidth parameters during the circuit setup. SVCs are
currently unavailable from most frame relay providers, and ATLAS only
supports PVCs.
Figure B-1 illustrates three PVCs being delivered over one physical circuit.
The frame relay switch within the frame relay provider's circuit makes a
physical connection for each PVC. Each of the PVCs could connect to a dif-
ferent physical location at the other end of the circuit. Figure B-2 illustrates
a frame relay network topology.

Figure B-1. Three Virtual Circuits in One Physical Circuit

A
Virtual circuit X
Virtual circuit Y
Virtual circuit Z
Frame Relay/Router

Figure B-2. Frame Relay Network using Virtual Circuits

ATLAS 550 User Manual
Frame Relay Frame Relay/Router
Network
Frame Relay/Router
B
C
Frame Relay/Router
D
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