DS1/T1. “Early 60s – Bell Labs digitized voice into a 64 kbps stream and multiplexed 24 elements in a channel resulting in 1.544 Mbps, or DS1/T1. European systems modified the approach and multiplexed 30 elements for a line rate of 2.048 Mbps, or E1. Not suitable for residences because they require new wire installations and frequent repeaters and corrupt adjacent 2X pairs.” (John F. Clark, “TEL 355: Communication and Information Systems in Organizations - Asymmetric Digital Subscriber Line - ADSL, Powerpoint presentation, School of Journalism and Telecommunications, University of Kentucky, Lexington, Kentucky, 2008, slide 6) |
