Quick Reference Guide

358 Glossary

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• LowerThresholdNon-critical

• LowerThresholdCritical

• LowerThresholdFatal

time-out

A specified period of system inactivity that must occur before an energy

conservation feature is activated.

tpi

Abbreviation for tracks per inch.

TQFP

Abbreviation for thin quad flat pack.

TSR

Abbreviation for terminate-and-stay-resident. A TSR program runs in the

background. Most TSR programs implement a pre-defined key combination

(sometimes referred to as a hot key) that allows you to activate the TSR program's

interface while running another program. When you finish using the TSR

program, you can return to the other application program and leave the TSR

program resident in memory for later use. TSR programs can sometimes cause

memory conflicts. When troubleshooting, rule out the possibility of such a

conflict by rebooting your system without starting any TSR programs.

TSOP

Abbreviation for thin small outline package. A very thin, plastic, rectangular

surface mount chip package with gull-wing pins on its two short sides.

UART

Acronym for universal asynchronous receiver transmitter, the electronic circuit that

makes up the serial port.

UDP

Abbreviation for user datagram protocol.

Abbreviation for Underwriters Laboratories.