A system in which the telephone has multiple buttons permitting the user to directly select central office phone lines and intercom lines. Key phone systems are most often found in relatively small business environments, typically around 50 telephones.
Designed primarily for small and medium businesses requiring from two to 130 multi-functional telephone sets and/or line combinations. The system resides on the customer's premises and can operate either on its own or in conjunction with a Private Branch Exchange (PBX). (See Private Branch Exchange.)
A multi-linetelephone terminal; lines are usually accessed by push-button and may be central office lines, foreign exchange lines, private lines, and so forth.
Key telephone systems are (usually small) multi-line private telephone network that allows each key telephone station to select one of several telephone lines, place a line on hold, and call via an intercom circuit between key telephones. Key systems contain a central key service unit (KSU) that coordinates status lights and lines to key telephones ("Key Sets").Newer KTS systems typically use only 4 wires to connect the electronic KSU to each electronic key telephone set, and are often called "skinny wire" key systems. Modern electronic key systems are small microprocessor controlled switching systems and have some of the same advanced call processing features such as call hold, busy status, multi-line conference, abbreviated dialing, and station-to-station intercom that are available in a larger PBX.
A multiline telephone system offering a limited range of features; key systems are popular among smaller businesses as their main telephone system. They are also found in large businesses as a form of extension to their big primary phone system. Key systems are characterized by manual selection of outgoing lines, their small size, and relatively low price.
A system that allows multiple telephones to share multiple pre-determined telephone lines. This is different from a collection of multi-lined telephones in the same environment. Avaya Partner ACS is an example of a Key system.
A key system or key telephone system is a multiline telephone system typically used in small office environments.
