Key system: Difference between revisions
Created page with "A key system is a type of telephone system designed to care for the communication needs of small to medium sized businesses. They offer many more user features than a normal single line telephone set, such as placing a line on hold, multi-line support. intercom service, attended transfer, etc. Unlike standard single-line telephones, which use a single wire pair to connect to a Central Office, key telephones require three wire pairs for each line. The ''talk pair'' is fo..." |
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A key system is a type of telephone system designed to | A '''key system''' is a type of telephone system designed to address the communication needs of small to medium sized businesses. They offer many more user features than a normal single line telephone set, such as placing a line on hold, multi-line support. intercom service, attended transfer, etc. | ||
Unlike standard single-line telephones, which use a single wire pair to connect to a Central Office, key telephones require three wire pairs for each line. The ''talk pair'' is for the voice circuit, the ''A-lead'' supervises the talk pair, and the ''lamp pair''powers the small incandescent lamp under the translucent key button at the front of the telephone. All three wire pairs connect to the the Key Service Unit (KSU) which interfaces between the key system and the outside telephone lines. | Unlike standard single-line telephones, which use a single wire pair to connect to a [[Central Office]], key telephones require three wire pairs for each line. The ''talk pair'' is for the voice circuit, the ''A-lead'' supervises the talk pair, and the ''lamp pair'' powers the small incandescent lamp under the translucent key button at the front of the telephone. All three wire pairs connect to the the Key Service Unit (KSU) which interfaces between the key system and the outside telephone lines. | ||
Latest revision as of 09:28, 12 April 2025
A key system is a type of telephone system designed to address the communication needs of small to medium sized businesses. They offer many more user features than a normal single line telephone set, such as placing a line on hold, multi-line support. intercom service, attended transfer, etc.
Unlike standard single-line telephones, which use a single wire pair to connect to a Central Office, key telephones require three wire pairs for each line. The talk pair is for the voice circuit, the A-lead supervises the talk pair, and the lamp pair powers the small incandescent lamp under the translucent key button at the front of the telephone. All three wire pairs connect to the the Key Service Unit (KSU) which interfaces between the key system and the outside telephone lines.