Lucent Technologies PortMaster, Configuration Manual

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6-1
Configuring a Synchronous WAN Port
6
This chapter describes the steps required to configure a PortMaster synchronous Wide
Area Network (WAN) port.
This chapter discusses the following topics:
• “Synchronous Port Uses” on page 6-1
• “Configuring WAN Port Settings” on page 6-4
See the PortMaster Command Line Reference for more detailed command descriptions and
instructions.
Synchronous Port Uses
Synchronous WAN ports are used for high-speed dedicated connections between two
remote local area networks (LANs). Once a connection is established between two
remote sites, a wide area network (WAN) is achieved. Synchronous WAN connections
can be achieved through the use of dedicated leased lines, Frame Relay connections,
switched 56Kbps lines, or ISDN lines. Connection rates can range from 9600bps to
2.048Mbps (E1). PortMaster products support any of these connection types using one
or more synchronous ports.
All WAN port connections are similar and are represented in Figure 6-1 on page 6-3.
For most applications, a dedicated line connects two PortMaster routers, each located on
a separate remote network
The following examples describe various uses for synchronous ports.
Routing over Leased Lines. A synchronous port can be used to connect to
synchronous leased lines from 9600bps to T1 (1.544Mbps) or E1 (2.048Mbps) for
continuous operation. A digital service unit/channel service unit (DSU/CSU) must be
attached to the WAN port on the PortMaster. For more information, see Chapter 19,
“Using Synchronous Leased Lines.”
Routing over Frame Relay. Frame Relay provides connectivity using a packet-
switched network. Its two advantages over a leased line network are lower cost and the
ability to have multiple permanent virtual circuits (PVCs) come into a single physical
port. It is especially popular for hub-and-spoke network arrangements. For example, a