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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

3^rd 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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