Hmmmm seems search engines are getting worse rather than better... Unlike many standards bodies ETSI at http://www.etsi.org are kind enough to allow free downloads of thier standards documents. Just go there, click "Standards on line" then type GSM in the query box and select the "Standard Type and Document N¡" search option and the site will list all of the GSM specs, and you can grab the ones you need...... Regrds, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mike Cornelius Internet: mike@bytethis.com.au Byte This Interactive Phone: +61 2 9310-2157 PO Box 1342 Strawberry Hills FAX: +61 2 9319-3948 NSW 2012 Australia URL: http://www.bytethis.com.au ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Alan Aldaba Sent: Saturday, December 11, 1999 2:03 PM To: PICLIST@MITVMA.MIT.EDU Subject: GSM [OT] Hi everyone, Sorry for bothering you, but i really need data on GSM, specially on error detection and correction. I've done some web searches but I seem to go nowhere...Links would be gratefully appreciated. Thanks in advance, Alan