T-carrier

T-carrier
   A digital communications service from a common carrier for voice or data transmission.
   The four-level, time-division multiplexing specification for the U.S. telephone system allows the bit stream of the smaller carriers to be multiplexed into the larger ones.
   The following are the four service levels:
   • T1
   Provides 24 channels of 64Kbps, giving a total bandwidth of 1.544Mbps.
   When a T1 service is made available in single 64Kbps increments, it is known as fractional T1.
   • T2
   The equivalent of 4 T1 services, T2 offers 96 channels of 64Kbps, for a total bandwidth of 6.3Mbps.
   • T3
   The equivalent of 28 T1 circuits, T3 offers 672 channels of 64Kbps, for a total bandwidth of 44.736Mbps. T3 is available commercially, but is not often used for LANs.
   • T4
   The equivalent of 168 T1 circuits, T4 provides 4,032 channels of 64Kbps, for a total bandwidth of 274.176Mbps.
   See also T1; T2; T3; T4.
   

Dictionary of networking . 2014.

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