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What (who) is Optical Carrier 12 - definition
EARLY TELEPHONE MULTIPLEXING SYSTEM
12 channel carrier system; 12 channel carrier
common carrier
PROFESSION
Common carriers; Common Carrier; Carrying for hire; Common carriage; Common carrier obligation; Common-carrier; Residual common carrier obligation; Public carrier; Motor carrier (designation)
<communications, company> (Or "phone company") A private
company that offers telecommunications services to the public.
(1995-03-20)
common carrier
PROFESSION
Common carriers; Common Carrier; Carrying for hire; Common carriage; Common carrier obligation; Common-carrier; Residual common carrier obligation; Public carrier; Motor carrier (designation)
¦ noun
1. a person or company undertaking to transport any goods or passengers on regular routes at agreed rates.
2. N. Amer. a company providing public telecommunications facilities.
Wikipedia
12-channel carrier system
In the U.S. telephone network, the 12-channel carrier system was an early frequency-division multiplexing system standard, used to carry multiple telephone calls on a single twisted pair of wires, mostly for short to medium distances. In this system twelve voice channels are multiplexed in a high frequency carrier and passed through a balanced pair trunk line similar to those used for individual voice frequency connections. The original system is obsolete today, but the multiplexing of voice channels in units of 12 or 24 channels in modern digital trunk lines such as T-1 is a legacy of the system.
