Configuring the FLOW CONTROL Characteristic

Configuring the FLOW CONTROL Characteristic

Introduction

The FLOW CONTROL characteristic allows the access server to start and stop data transfer between the port and the attached device. Flow control prevents data losses due to lack of buffering space.

The FLOW CONTROL characteristic does not apply to data transfer between the access server and a network resource. For a particular session, however, the network resource might manage FLOW CONTROL between the port and the host.

Flow Control Types

The types of FLOW CONTROL that you can configure are:

∙XON/XOFF

∙DSR

∙CTS

∙No Flow Control

∙Flow Control Direction

XON/XOFF

When the access server use XON/XOFF FLOW CONTROL on a port, it sends

∙An XON character to start the data transfer between the port and the attached device

∙An XOFF character to stop the data transfer between the port and the attached device

XON/XOFF is the type of FLOW CONTROL that Digital Equipment Corporation’s terminals, personal computers, printers, and modems use.

When to Use

You must use XON/XOFF FLOW CONTROL when you use:

∙DSR logout (See Specifying DSRLOGOUT in this chapter.)

∙Signal check (See Specifying SIGNAL CHECK in Chapter 10.)

9-10 Configuring Basic Device Characteristics