Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4616

f) 0 shall be transmitted in each of the 13 bits of the AC field if altitude information is not available or if the altitude has been determined invalid. 3.1.2.6.6 COMM-B ALTITUDE REPLY, DOWNLINK FORMAT 20 This reply shall be generated in response to an interrogation UF 4 or 20 with an RR field value greater than 15. The format of this reply shall consist of these fields: 3.1.2.6.6.1 MB: Message, Comm-B. This 56-bit (33-88) downlink field shall be used to transmit data link messages to the ground. 3.1.2.6.7 SURVEILLANCE IDENTITY REPLY, DOWNLINK FORMAT 5 This reply shall be generated in response to an interrogation UF 5 or 21 with an RR field value less than 16. The format of this reply shall consist of these fields: 3.1.2.6.7.1 ID: Identity (Mode A code). This 13-bit (20-32) field shall contain aircraft identity code, in accordance with the pattern for Mode A replies in 3.1.1.6. Starting with bit 20, the sequence shall be C1, A1, C2, A2, C4, A4, ZERO, B1, D1, B2, D2, B4, D4. DF FS DR UM AC MB AP Field Reference DF downlink format 3.1.2.3.2.1.2 FS flight status 3.1.2.6.5.1 DR downlink request 3.1.2.6.5.2 UM utility message 3.1.2.6.5.3 AC altitude code 3.1.2.6.5.4 MB message, Comm-B 3.1.2.6.6.1 AP address/parity 3.1.2.3.2.1.3 DF FS DR UM ID AP Field Reference DF downlink format 3.1.2.3.2.1.2 FS flight status 3.1.2.6.5.1 DR downlink request 3.1.2.6.5.2 UM utility message 3.1.2.6.5.3 ID identity 3.1.2.6.7.1 AP address/parity 3.1.2.3.2.1.3 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume IV 28/11/02 3-36 3.1.2.6.8 COMM-B IDENTITY REPLY, DOWNLINK FORMAT 21 This reply shall be generated in response to an interrogation UF 5 or 21 with an RR field value greater than 15. The format of this reply shall consist of these fields: 3.1.2.6.9 LOCKOUT PROTOCOLS 3.1.2.6.9.1 Multisite all-call lockout Note.— The multisite lockout protocol prevents transponder acquisition from being denied one ground station by lockout commands from an adjacent ground station that has overlapping coverage. 3.1.2.6.9.1.1 The multisite lockout command shall be transmitted in the SD field (3.1.2.6.1.4.1). A lockout command for an II code shall be transmitted in an SD with DI = 1 or DI = 7. An II lockout command shall be indicated by LOS code equals 1 and the presence of a non-zero interrogator identifier in the IIS subfield of SD. A lockout command for an SI code shall be transmitted in an SD with DI = 3. SI lockout shall be indicated by LSS equals 1 and the presence of a non-zero interrogator identifier in the SIS subfield of SD. After a transponder has accepted an interrogation containing a multisite lockout command, that transponder shall commence to lock out (i.e. not accept) any Mode S-only all-call interrogation which includes the identifier of the interrogator that commanded the lockout. The lockout shall persist for an interval TL (3.1.2.10.3.9) after the last acceptance of an interrogation containing the multisite lockout command. Multisite lockout shall not prevent acceptance of a Mode S-only all-call interrogation containing PR codes 8 to 12. If a lockout command (LOS = 1) is received together with IIS = 0, it shall be interpreted as a non-selective all-call lockout (3.1.2.6.9.2). Note 1.— Fifteen interrogators can send independent multisite II lockout commands. In addition, 63 interrogators can send independent SI lockout commands. Each of these lockout commands must be timed separately. Note 2.— Multisite lockout (which only uses non-zero II codes) does not affect the response of the transponder to Mode S-only all-call interrogations containing II equals 0 or to Mode A/C/S all-call interrogations. 3.1.2.6.9.2 Non-selective all-call lockout Note 1.— In cases where the multisite lockout protocol for II codes is not required (e.g. there is no overlapping coverage or there is ground station coordination via ground-to-ground communications) the non-selective lockout protocol may be used. On acceptance of an interrogation containing code 1 in the PC field, a transponder shall commence to lock out (i.e. not accept) two types of all-call interrogations:

Source: https://magyarkozlony.hu/hivatalos-lapok/4c6310a937d14bac566ee9c9d944896656c292dd/dokumentumok/5a6ac3c6db12e692ae41096677ad5f072d2cc9f3/letoltes