Click on an index letter to navigate through our glossary terms:
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KEY SERVICE UNIT (KSU)
The common equipment that operates key telephone systems. -
KEY TELEPHONE
A telephone that operates on a key system. Normally this phone has all of the lines that are on the system appearing on the set. -
KEY TELEPHONE SYSTEM (KEY SYSTEM)
A system normally served by loop start lines that can appear on all sets and operate without an operator console. -
KILOBYTE
1024 BYTEs (see also)