Welcome

Welcome to the csn1.info website. This site contains a description of the CSN.1 (Concrete Syntax Notation 1) language widely used by ETSI and 3GPP for the encoding of 2G/3G messages.

The information here reported are taken from official documents and integrated by the long experience made by Dafocus in the encoding/decoding field.
Dafocus , which is sponsoring this site, is the maker of Encodix , a market leader encoding/decoding generation tool, which has a complete support of the CSN.1 language.

Index:

Introduction - basic concepts of CSN.1
Core rules - the Bx rules of CSN.1
Advanced rules - the Ax rules of CSN.1
Other rules - other even more advanced rules
CSN.1 vs ASN.1 - CSN.1 compared to ASN.1
Pitfalls - Common problems related to CSN.1