
114078 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 circuits on a Bay Networks router.
This guide assumes that someone has already added the network interfaces to the
router configuration file by configuring a circuit on the hardware connectors and
enabling bridging/routing services. See Configuring Routers for information
about these tasks.
What’s the Default?
With the exception of multichannel circuits (MCE1 and MCT1), the router
software automatically sets default values for the line service parameters when
you add a network interface. See Appendix B for a list of the default line service
parameter values for each circuit type.
Line defaults are suitable for many networks; however, you can use the
Configuration Manager to customize these settings based on your network
composition and requirements. Chapters 3 through 6 provide information about
editing the protocol-specific line parameters.
Note: In the OSI internetworking model, the physical layer manages the
transmission of bits across the physical media (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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