T1

   A 1.544M (in the USA and Japan) or 2.048M (elsewhere) bps bandwidth, data communications facility available in many versions, including: formatted Accunet, which is a formatted T1 offering that requires compliance with both AT&T DSX-1 hardware and DS1 software standards; and unformatted, which only requires compliance with the DSX-1 standard. (The formatted version provides less usable bandwidth.