Asynchronous transmission
www.fratec.com/wan/NFO_WAN_001.HTML
www.telecom.tbi.net/async1.html
www.awstevenson.demon.co.uk/SYSNOTES/synas.htm
www.nor001.com/ansychronous-tran-mode.htm
www.integritycomputing.com/ppt2/tsld009.htm
www.techfest.com/networking/wan/async.htm