Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 1815

5. ATN router access to end-systems may be made via other intermediate systems. AIR To/from end-systems (see Notes 4 and 5) ATN router DTE GROUND To/from end-systems (see Notes 4 and 5) ISO 8208 Packet layer protocol ATN router DTE SSE interface (5.2.3.2.1) SSE alternative interface (5.2.3.2.2) ISO 8208 interface (5.2.3.1) ISO 8208 interface (5.2.3.1) SNME alternative interface (5.2.8.2) A D L P DCE (5.2.4) DCE (5.2.4) G D L P Mode S specific services entity (SSE) Mode S specific services entity (SSE) Reformatting process (5.2.5.2) Reformatting process (5.2.5.2) Mode S subnetwork management entity (SNME) Mode S subnetwork management entity (SNME) Mode S packet layer protocol ADCE (5.2.6) GDCE (5.2.6) (5.2.8) (5.2.8) (5.2.7.2) (5.2.7.1) Frame processing (5.2.2 and 5.2.7) TRANSPONDER Mode S SVC frames and Mode S specific frames Frame processing (5.2.2 and 5.2.7) INTERROGATOR (5.2.3.4) (see Note 3) (5.2.3.3) Mode S link protocol Annex 10 — Aeronautical Communications Volume III 22/11/07 I-5-6 Note.— Each Comm-A segment (MA field) received by the ADLP is accompanied by the first 32 bits of the interrogation that delivered the segment (3.1.2.10.5.2.1.1 of Annex 10, Volume IV). Within these 32 bits is the 16-bit special designator (SD) field (3.1.2.6.1.4 of Annex 10, Volume IV). 5.2.2.1.1.1 SD field. When the designator identification (DI) field (bits 14-16) has a code value of 1 or 7, the special designator (SD) field (bits 17-32) of each Comm-A interrogation shall be used to obtain the interrogator identifier subfield (IIS, bits 17-20) and the linked Comm-A subfield (LAS, bits 30-32). The action to be taken shall depend on the value of LAS. The contents of LAS and IIS shall be retained and shall be associated with the Comm-A message segment for use in assembling the frame as indicated below. All fields other than the LAS field shall be as defined in 3.1.2 of Annex 10, Volume IV. Note.— The SD field structure is shown in Figure 5-1*. 5.2.2.1.1.2 LAS coding. The 3-bit LAS subfield shall be coded as follows: LAS MEANING single segment linked, 1st segment linked, 2nd but not final segment linked, 3rd but not final segment linked, 4th and final segment linked, 2nd and final segment linked, 3rd and final segment unassigned 5.2.2.1.1.3 Single segment SLM frame. If LAS = 0, the data in the MA field shall be considered a complete frame and shall be made available for further processing. 5.2.2.1.1.4 Multiple segment SLM frame. The ADLP shall accept and assemble linked 56-bit Comm-A segments associated with all sixteen possible interrogator identifier (II) codes. Correct linking of Comm-A segments shall be achieved by requiring that all Comm-A segments have the same value of IIS. If LAS = 1 through 6, the frame shall consist of two to four Comm-A segments as specified in the following paragraphs. 5.2.2.1.1.4.1 Initial segment. If LAS = 1, the MA field shall be assembled as the initial segment of an SLM frame. The initial segment shall be stored until all segments of the frame have been received or the frame is cancelled. 5.2.2.1.1.4.2 Intermediate segment. If LAS = 2 or 3, the MA field shall be assembled in numerical order as an intermediate segment of the SLM frame. It shall be associated with previous segments containing the same value of IIS. 5.2.2.1.1.4.3 Final segment. If LAS = 4, 5 or 6, the MA field shall be assembled as the final segment of the SLM frame. It shall be associated with previous segments containing the same value of IIS. 5.2.2.1.1.4.4 Frame completion. The frame shall be considered complete and shall be made available for further processing as soon as all segments of the frame have been received. 5.2.2.1.1.4.5 Frame cancellation. An incomplete SLM frame shall be cancelled if one or more of the following conditions apply: * All figures and tables are located at the end of this chapter. Part I Annex 10 — Aeronautical Communications I-5-7 22/11/07

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