Allied Telesis AT-9900, RAPIER I, X900-48FE Asynchronous Port Enhancement, Set asyn, Show asyn

52 Asynchronous Port Enhancement Release Note

Asynchronous Port Enhancement

This section describes the enhancement. The modified commands to implement it are described in Command Reference Updates.

Making Asynchronous Ports Respond More Quickly

When an asynchronous port is in ten mode, it bundles together the characters that it receives within a certain time period, instead of passing them one at a time to a higher protocol layer for processing. The time period over which characters are bundled is set by the ten timer.

Bundling reduces the load on the CPU by spreading the character processing overhead across several characters. If a remote terminal session is involved, bundling also reduces the number of packets on the network by sending more characters in each packet. However, bundling reduces terminal responsiveness.

A ten timer value of 100 milliseconds is generally a good compromise between responsiveness and processing overhead. If you need to increase the port’s responsiveness, this enhancement enables you to reduce the length of the ten timer. To do this, use the new tentimervalue parameter in the set asyn command:

set asyn[=port-number] [tentimervalue=20..100] [other optional

parameters]

Unless you are logged in via the port you want to change, also specify the asynchronous port number.

The default tentimervalue value is 100 milliseconds, which is the value it had before this enhancement.

To display a port’s value for the ten timer, use the command:

show asyn=port-number

In the output, check the new Ten timer value field. Note that the Mode field displays Ten if the asynchronous port is a terminal server port in ten mode.

Command Changes

The following table summarises the modified commands:

Command	Change
set asyn	New tentimervalue parameter
show asyn	New Ten timer value field

Software Version 2.8.1 C613-10477-00 REV B