Editing Digital Signal 1 (section)

{{Short description|T-carrier signal by Bell Labs}}
{{About|the communications protocol|an introduction to digital networks|T-carrier}}
{{Use dmy dates|date=July 2020}}

'''Digital Signal 1''' ('''DS1''', sometimes '''DS-1''') is a [[T-carrier]] signaling scheme devised by [[Bell Labs]].<ref name=brettglass>{{cite magazine |title=How Bell Ran in Digital Communications |date=September 1996 |url=http://www.byte.com/art/9609/sec10/art6.htm |archive-url=https://web.archive.org/web/20080905000701/http://www.byte.com/art/9609/sec10/art6.htm |archive-date=2008-09-05 |publisher=[[Byte (magazine)|Byte]] |author=Brett Glass}}</ref> DS1 is the primary digital telephone standard used in the [[United States]], [[Canada]] and [[Japan]] and is able to transmit up to 24 [[Time-division multiplexing|multiplexed]] voice and data calls over telephone lines. [[E-carrier]] is used in place of T-carrier outside the United States, Canada, Japan, and South Korea. DS1 is the logical bit pattern used over a physical [[T-carrier|T1]] line; in practice, the terms ''DS1'' and ''T1'' are often used interchangeably.{{efn|The "DS" refers to the rate and format of the ''signal'', while the "T" designation refers to the ''equipment'' providing the signals. In practice, "DS" and "T" are used synonymously; hence '''DS1''' is '''T1''' and vice versa.}}