Configuring A Synchronous Wan Port; Synchronous Port Uses - Lucent Technologies PortMaster 4 Configuration Manual

Configuring a Synchronous WAN Port

This chapter describes the steps required to configure a PortMaster 4 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 6-2
See the PortMaster 4 Command Line Reference for more detailed command descriptions and
instructions.
You can also configure the PortMaster 4 using the PMVision application for Microsoft
Windows, UNIX, and other platforms supporting the Java Virtual Machine (JVM).
PMVision replaces the PMconsole interface to ComOS.

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 created. 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). The PortMaster 4 supports any of these connection types using one or
more synchronous ports.
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. The Quad T1 boards on a PortMaster 4 have a built-in channel
service unit/digital service unit (CSU/DSU). For more information, see Chapter 13
"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 dozen field offices with 56Kbps or fractional T1 Frame Relay connections can
connect to a central office using a fractional T1 or T1 Frame Relay connection. The
central office requires only one CSU/DSU and synchronous port on the PortMaster,
instead of 12. For more information, see Chapter 12 "Using Frame Relay."
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