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Standard ECMA-312
Private Integrated Services Network (PISN) - Profile Standard for the Use of PSS1 (QSIG) in Air Traffic Services Networks

3rd edition (June 2003)

The latest edition of this Ecma Standard is available here.

You can download the previous replaced "historical" editions of this Ecma Standard, free of charge:

File name Content
ECMA-312 1st edition Acrobat (r) PDF file
ECMA-312 2nd edition Acrobat (r) PDF file

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