AMC1 ACNS.B.DLS.B1.105 Transport Layer Requirements

• 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.B1.105 Transport Layer Requirements ED Decision 2013/031/R The ATN End System of the data link aircraft equipment should comply with the Transport Protocol Class 4 specified in ICAO Document 9705 (Edition 2), Sub-volume V, section 5.5.2. The data link aircraft equipment should implement Transport Protocol Class 4 parameter settings in accordance with the following table: <table border="1" cellpadding="0" cellspacing="0" width="603"><tr><td valign="top" width="121"><p>Scope</p></td><td valign="top" width="123"><p>Parameter</p></td><td valign="top" width="274"><p>Definition</p></td><td valign="top" width="85"><p>Value</p></td></tr><tr><td valign="top" width="121"><p>Inactivity</p></td><td valign="top" width="123"><p>Inactivity time (I)</p></td><td valign="top" width="274"><p>A bound for the time after which a transport entity will, if it does not receive a Transport Protocol Data Unit (TPDU), initiate the release procedure to terminate the transport connection.</p></td><td valign="top" width="85"><p>360 sec</p></td></tr><tr><td valign="top" width="121"><p>Re-transmission</p></td><td valign="top" width="123"><p>Retransmission time (T1)</p></td><td valign="top" width="274"><p>A bound for the maximum time the transport entity will wait for acknowledgement before re-transmitting a TPDU.</p><p>The retransmission time is adaptive.</p></td><td valign="top" width="85"><p>Initial value 30 sec</p></td></tr><tr><td valign="top" width="121"></td><td valign="top" width="123"><p>Maximum</p><p>Retransmission</p><p>(N)</p></td><td valign="top" width="274"><p>Maximum number of TPDU retransmissions.</p></td><td valign="top" width="85"><p>7</p></td></tr><tr><td valign="top" width="121"><p>Window</p></td><td valign="top" width="123"><p>Window time (W)</p></td><td valign="top" width="274"><p>A bound for the maximum time a transport entity will wait before retransmitting up-to-date window information.</p></td><td valign="top" width="85"><p>120 sec</p></td></tr><tr><td valign="top" width="121"><p>Flow Control</p></td><td valign="top" width="123"><p>Local Acknowledgement delay (Al)</p></td><td valign="top" width="274"><p>A bound for the maximum time which can elapse between the receipt of a TPDU by the local transport entity from the network layer and the transmission of the corresponding acknowledgement.</p></td><td valign="top" width="85"><p>1 sec</p></td></tr></table>