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Introduction 45
OnSite 2800 Series User Manual 4 • Serial port configuration
Introduction
This chapter provides an overview of the serial port and describes the tasks involved in its configuration
through the OnSite router, it includes the following sections:
• Serial port configuration task list
• Configuration tasks
• Examples
The V.35 standard is recommended for speeds up to 48 kbps, although in practice it is used successfully at 4
Mbps. The X.21 standard is recommended for data interfaces transmitting at rates up to 2 Mbps and is used
primarily in Europe and Japan.
The synchronous serial interface supports full-duplex operation and allows interconnection to various serial
network interface cards or equipment.
The OnSite device supports the Frame Relay protocol on the synchronous serial interface. Frame Relay is an
example of a packet-switched technology. Packet-switched networks enable end stations to dynamically share
the network medium and the available bandwidth. Variable-length packets are used for more efficient and flex-
ible transfers. These packets are then switched between the various network segments until the destination is
reached. Statistical multiplexing techniques control network access in a packet-switched network. The advan-
tage of this technique is that it provides more flexibility and more efficient use of bandwidth.
Serial port configuration task list
Perform the tasks in the following sections to configure a synchronous serial interface:
• Disabling an interface (see page 45)
• Enabling an interface (see page 46)
• Configuring the serial encapsulation type (see page 47)
• Entering Frame Relay mode (see page 48)
• Configuring the LMI type (see page 48)
• Configuring the keep-alive interval (see page 49)
• Entering Frame Relay PVC configuration mode (see page 49)
• Configuring the PVC encapsulation type (see page 50)
• Binding the Frame Relay PVC to IP interface (see page 50)
• Disabling a Frame Relay PVC (see page 52)
• Displaying Frame Relay information (see page 54)
Disabling an interface
Before you replace a compact serial cable or attach your OnSite to other serial equipment, use the
shutdown
command to disable the serial interfaces. This prevents anomalies and hardware faults. When you shut down
an interface, it has the state CLOSED in the
show port serial command display.