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Overview of T1/E1 WAN Applications T1/E1 WAN Configuration Guide

Overview of T1/E1 WAN Applications

Wide area networks (WANs) provide the mechanism for connecting remote sites together and connecting

your local network to the Internet through a connection to an ISP. WANs use a variety of physical

transports; T1/E1 connections are a common means of transport.T1 circuits are generally used in domestic

applications, while E1 circuits are widely deployed internationally. T1/E1 circuits are a relatively

inexpensive investment because they allow remote sites to share corporate resources at other locations and

thus eliminate the need for redundant equipment at multiple locations. For example, a corporation with

many small branch offices can consolidate their Internet access through a single interface and avoid paying

for Internet connectivity at each small office. Not only does this provide a cost savings, but it also gives the

corporation’s IT department more control over Internet usage and protection at each of the branch offices.

Many companies have centralized databases that must be used by employees at remote locations. Creating

a WAN connection between the centralized database and the remote location allows the remote users full

access to the resources.

Configuring T1/E1 WAN applications includes six steps:

1. Configure the physical interfaces (Ethernet and WAN interfaces)

2. Configure the L2 protocol(s)

3. Cross-connect the physical and virtual (L2) interfaces

4. Create access lists and policies (including NAT parameters)

5. Apply the policies to interfaces

6. Configure the routing information (static routes, OSPF, RIP, etc.)

These configuration steps are explained on the following pages. Each step includes a brief discussion of

available settings, but does not elaborate on parameters that are normally left in the default state. In

addition, each step provides a sample command listing for a generic configuration. Specific example

configurations (with configuration scripts) are provided at the end of this document. For detailed

information regarding WAN configuration parameters, refer to the documentation provided on your

ADTRAN OS System Documentation CD.

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ADTRAN E1 Manual de usuario Pagina 2