AMC1 ACNS.B.DLS.B1.110 Session Layer Requirement

• ED Decision 2013/031/R found in: GM Remote Aerodrome Air Traffic Services (ED 2019/004/R) Issue 2 (Jul 2020)

AMC1 ACNS.B.DLS.B1.110 Session Layer Requirement ED Decision 2013/031/R (a) The ATN End System of the data link aircraft equipment should support a Session Protocol as specified in ICAO Doc 9705 (Edition 2), Sub-Volume IV, section 4.4 including the ISO/IEC 8327 Technical Corrigendum 1 (2002), listed in the following table. <table border="1" cellpadding="0" cellspacing="0" width="567"><tr><td valign="top" width="142"><p>Value (Hex)</p></td><td valign="top" width="161"><p>Abbreviation</p></td><td valign="top" width="265"><p>Full SPDU Name</p></td></tr><tr><td valign="top" width="142"><p>E8</p></td><td valign="top" width="161"><p>SCN</p></td><td valign="top" width="265"><p>Short Connect</p></td></tr><tr><td valign="top" width="142"><p>F0</p></td><td valign="top" width="161"><p>SAC</p></td><td valign="top" width="265"><p>Short Accept</p></td></tr><tr><td valign="top" width="142"><p>D8</p></td><td valign="top" width="161"><p>SACC</p></td><td valign="top" width="265"><p>Short Accept Continue</p></td></tr><tr><td valign="top" width="142"><p>E0-E3</p></td><td valign="top" width="161"><p>SRF</p></td><td valign="top" width="265"><p>Short Refuse</p><p>E0: TC retained, transient refusal<br/> E1: TC retained, persistent refusal<br/> E2: TC released, transient refusal<br/> E3: TC released, persistent refusal</p></td></tr><tr><td valign="top" width="142"><p>A0</p></td><td valign="top" width="161"><p>SRFC</p></td><td valign="top" width="265"><p>Short Refuse Continue</p></td></tr></table> (b) The ATN End System Session Protocol of the data link system should make use of the value ‘E3’ to encode the Short Refuse (SRF) SPDU.