Symbol-technologies MC50 User Manual download pdf (Page 93)

Glossary GL-13

Tolerance Allowable deviation from the nominal bar or space width.

Transmission Control Protocol/Internet Protocol See TCP/IP.

Trivial File Transfer Protocol See TFTP.

TSR See Terminate and Stay Resident.

UPC Universal Product Code. A relatively complex numeric symbology.

Each character consists of two bars and two spaces, each of which

is any of four widths. The standard symbology for retail food

packages in the United States.

UDP User Datagram Protocol. A protocol within the IP protocol suite that

is used in place of TCP when a reliable delivery is not required. For

example, UDP is used for real-time audio and video traffic where

lost packets are simply ignored, because there is no time to

retransmit. If UDP is used and a reliable delivery is required, packet

sequence checking and error notification must be written into the

applications.

Visible Laser Diode (VLD) A solid state device which produces visible laser light.

WAN Wide-Area Network. A radio network that supports data

communication beyond a local area. That is, information can be

sent across a city, state, or even nationwide.

Warm Boot A warm boot restarts the mobile computer by closing all running

programs. All data that is not saved to flash memory is lost.

WEP Wired Equivalent Privacy, is specified by IEEE for encryption and

decryption of RF (wireless) communications.

WEP Encryption (Wired Equivalent Privacy encryption) The conversion of data into a

secret code for transmission over a public network. The original

text, or plaintext, is converted into a coded equivalent called

ciphertext via an encryption algorithm. The ciphertext is decoded

(decrypted) at the receiving end and turned back into plaintext. The

encryption algorithm uses a key, which is a binary number that is

typically from 40 to 128 bits in length. The greater the number of

bits in the key (cipher strength), the more possible key combinations

and the longer it would take to break the code. The data is

encrypted, or “locked,” by combining the bits in the key

mathematically with the data bits. At the receiving end, the key is

used to “unlock” the code and restore the original data.

Wireless Local Area Network (WLAN) See LAN.

Wireless Wide Area Network (WWAN) See WAN.

WNMP (Wireless Network Management Protocol) This is Symbol’s

proprietary MAC layer protocol used for inter access point

communication and other MAC layer communication.

WNMS (renamed to AirBEAM

Manager) See AirBEAM

Manager.

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