EDI*Net used a fault-tolerant Tandem NonStop computer with a second synchronized remote disaster NonStop computer over 100 miles apart. Mirrors of each other, and maintaining uptimes over 99.994%, they were each connected to a high speed data links using Tymnet as the connection and translation medium. Tymshare developed a bi-sync modem interface (HSA), a translation module to translate between EBCDIC and ASCII (BBXS), and a highly customized X.25 module (XCOM). EDI*Net used these interfaces on the Tandems. EDI*Net supported & contributed to many EDI standards, with the United Nations' EDIFACT and ANSI X12 dominating. As a store-and-forward service, EDI*Net supported multiple delivery protocols besides X.25 and BiSync, including FTPS, SMTPS and ZModem, and allowed the enveloping structure of supported EDI standards to extend into X.400 and SMTP envelopes.