| The T-1 carrier is the base level carrier in the Americas and parts of Asia. It consists of 24 voice channels, each digitized at a rate of 8kb/s with an 8 bit sample. The resulting 64kb/s datarate when multiplied by 24 is 1.536 Mb/s. The T-1 rate of 1.544 Mb/s includes additional signalling. In Europe, the standard carrier, often called E-1, is 30 channels plus signalling resulting in a rate of 2.048 Mb/s. |