Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4458

c) more than 6 seconds have elapsed since the start of the group. 3.2.2.3.5 All the traffic blocks in the TIS traffic data message group (1 to n) shall form the display for the current time. A new group shall then be initiated by the receipt of another TIS traffic data uplink “first” segment message. TIS traffic data uplink messages of type “intermediate” or “final” shall be ignored if a new group has not been initiated by receipt of a “first” segment. 3.2.2.4 TIS ESTABLISHMENT/DISCONNECTION PROTOCOLS The processing required to establish/disconnect TIS with Mode S ground interrogators when coverage boundaries are crossed shall be based upon information contained in the capability registers within the aircraft’s Mode S transponder as well as two specific TIS uplink messages. Number of traffic aircraft Structure of group First First First and final First and final First, 1 intermediate, and final First, 1 intermediate, and final First, 2 intermediates, and final First, 2 intermediates, and final etc. First, intermediates, and final 2007/70/II. szám Part I Annex 10 — Aeronautical Telecommunications 5-137 28/11/02 No. 77 3.2.2.4.1 Mode S capability report Transponder register 1016 within the Mode S transponder shall contain bits that indicate the level of the aircraft with respect to Mode S functions. This register shall be read by each Mode S ground interrogator that acquires the aircraft. Bit 25 of this register shall be set to “ONE” if the aircraft carries any MSP data link services (i.e. TIS). Note.— This bit merely indicates the presence of MSP data link services on board the aircraft — it does NOT indicate whether any of these services are in use by the aircrew at a given time. 3.2.2.4.2 MSP capability report Transponder registers 1D16 to 1F16 within the Mode S transponder contain bits which indicate the dynamic state of certain MSP data services on board the aircraft (where defined in applications, e.g. TIS). These registers shall be read by each Mode S ground interrogator that acquires the aircraft if the Mode S capability report indicates that the aircraft carries MSP data link services. Bit 2 of the MSP capability report register 1D16 shall be set to “ONE” if TIS support is desired; otherwise, the bit shall be set to “ZERO”. Setting and resetting this bit shall be done in conjunction with the generation of TIS “service connect requests” (TSCR) and “service disconnect requests” (TSDR) downlink messages as specified in section 4 for downlink broadcast identifier 0216. 3.2.2.4.3 Keep-alive timer In the absence of TIS traffic data messages, TIS keep-alive messages shall be uplinked by the Mode S ground interrogator. The TIS airborne processor shall keep a timer that measures the time interval between TIS uplink messages received. The timer shall be reset each time a TIS uplink message is received. If this “keep-alive” timer reaches 60 seconds (the “keep-alive” time parameter for TIS), the TIS ground-to-air service shall be declared to have failed and TIS support is no longer available from the Mode S ground interrogator. Note.— The data link service processing for TIS must receive periodic uplink messages from the Mode S ground interrogator in order to ensure that the ground-to-air link is maintained and that the ground TIS support is continuing. 3.2.2.4.4 TIS principal interrogator identifier (II) code protocol Each TIS uplink message shall be accompanied by a 4-bit interrogator identifier (II) code that identifies which Mode S ground interrogator (or interrogators cluster) generated it. At any given moment, only one Mode S ground interrogator shall be declared as the “principal interrogator” (PI). In areas having overlapping Mode S coverage by interrogators with different II codes, an “alternate interrogator” (AI) shall also be declared. The TIS protocol for handling II codes shall be as defined below. Note.— II codes are assigned to Mode S interrogators in such a way that interrogators with overlapping surveillance coverage that are not clustered cannot have identical II codes. 3.2.2.4.5 TIS display generation If TIS messages are received from more than one interrogator at a time, only those TIS messages from the interrogator currently declared as the PI shall be displayed to the pilot. TIS messages from interrogators other than the PI shall be discarded, except for the AI processing described below. 3.2.2.4.6 Alternate interrogator (AI) identification The II code of the most recently received TIS message not from the PI shall be retained as the AI. In the case that no TIS messages have been received from interrogators other than the PI (as described below), no current AI shall be defined. The AI definition shall be initialized to the “none state” when TIS is enabled (TSCR) or disabled (TSDR) by the pilot. 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume III 5-138 28/11/02 No. 77 3.2.2.4.7 Principal interrogator (PI) identification The II code of the first Mode S ground interrogator to respond to the TSCR downlink message with a TIS uplink message becomes the PI. The PI shall be retained until either:

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