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117021-A Rev. A 1-1
Chapter 1
Getting Started
This chapter describes how to access the physical and data link layer (line)
services for the configured WAN circuits on a Bay Networks router.
What’s the Default Configuration?
With the exception of multichannel circuits (MCE1 and MCT1), router software
automatically sets default values for line service parameters when you add a
network circuit.
Line defaults are suitable for most networks; however, you can use the
Configuration Manager tool to customize these settings based on your network
composition and requirements.
See Appendix B for a list of the default line service parameter values for each
circuit type.
Note: In the OSI internetworking model, the physical layer manages the
transmission of bits across the physical media (for example, cable or modem
interface); a physical layer protocol defines the electrical and mechanical
interface. The data link layer defines the procedures for transferring data
accurately and reliably across the physical layer.
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