To use the glossary, simply click below on the first letter of the term of interest:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

J

JPEG

Joint Photographic Experts Group. An ISO video compression standard for storage and transmission of a wide variety of still graphics image formats. Currently used by digital cameras and is commomly used for graphics on the Internet.

In telecommunications and videoconferencing, JPEG may be used in conjunction with fully compliant ITU-T codecs and includes both lossy and lossless modes. Note that so-called "motion JPEG" is a proprietary method of motion video transmission, and is not a standard.

K

Kbps (Kb/s)

Kilobits (thousands of bits) per second. One kilobit contains 1,024 bits ( 2 ¹⁰ bits)

KBps (KB/s)

KiloBytes (thousands of bytes or octets) per second. One kilobyte contains 1,024 bytes ( 2 ¹⁰ bytes)

Key

A sequence of symbols applied to data in order to provide encryption. Sometimes referred to as the "seed".

KG

Key Generator. A device external to a codec or other telecommunications equipment for maintaining the security of classified communications using encryption techniques. Provides much better security than DES and is generally used only by the military, NASA, NATO and some military contractors.

KHz

KiloHertz, (analog), thousands of cycles per second.

Ku-band

A microwave frequency band. When used for satellite links, the frequencies assigned are:

• uplink (to the satellite): 14.0-14.5 GHz
• downlink (from the satellite): 11.7-12.2 GHz

Ku-band is susceptible to rainfall attenuation, often noted by DBS customers as blocking.

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