T-W

Tag identification (TID)memory

Consists of information about the tag itself, such as tag ID.

Tag-talks-first (TTF)

When an active tag sends out the signal first.

Thermal transfer

A printing method that requires RFID labels and a printing ribbon. The ribbon is a wax- and/or resin-coated plastic strip that comes in rolls. The coating is transferred by a printhead onto a label, creating the printed information.

Time in beam

See Dwell time.

Time-division multiplexing

A process based on readers sending signals on the same frequency in assigned time slots or operating for a certain time interval when other readers are turned off.

Ultra-high frequency (UHF)

860 MHz to 960 MHz, which is the frequency at which passive UHF tags operate. Active tags usually operate around 433 MHz.

User memory

Provides a space for user-defined data.

Variable isolation approach

The process of isolating a problem by effectively documenting the business process and recording the entire system, component by component.

Voltage standing wave ratio (VSWR)

Allows you to tune an antenna properly for whatever resonant frequency you are looking to read across. You can also compare the performance across the antenna.

Wipe-on label applicator

A label applicator that works as follows: As the item approaches the applicator, a sensor detects the item and triggers the applicator to issue a label. This label is then "wiped on" the item, and a foam roller helps to press down the label to ensure its hold.

Write-once read-many (WORM)

A tag's data or number can be written by the user.