Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2335

e) the SPI condition (3.1.2.6.10.1.3). 3.1.2.10.5.1.4 Interfaces for variable direct data. A means shall be provided for the Mode A identity code, the SPI condition and, for transponders of Level 2 and above, the aircraft identification to be inserted by the pilot via a variable data interface. Interfaces shall be included to accept the pressure-altitude and on-the-ground coding. Note.— A specific interface design for the variable direct data is not prescribed. 3.1.2.10.5.2 Indirect data Note.— Indirect data are those which pass through the transponder in either direction but which do not affect the surveillance function. Annex 10 — Aeronautical Telecommunications Volume IV 22/11/07 3-68 If origins and/or destinations of indirect data are not within the transponder’s enclosure, interfaces shall be used for the necessary connections. 3.1.2.10.5.2.1 The function of interfaces Note.— Indirect data interfaces for standard transactions serve interrogations which require a reply and the broadcast function. Indirect data interfaces for ELM serve that system and require buffering and protocol circuitry within the transponder. Interface ports can be separate for each direction and for each service or can be combined in any manner. 3.1.2.10.5.2.1.1 Uplink standard length transaction interface. The uplink standard length transaction interface shall transfer all bits of accepted interrogations, (with the possible exception of the AP field), except for UF = 0, 11 or 16. Note.— AP can also be transferred to aid in integrity implementation. 3.1.2.10.5.2.1.2 Downlink standard length transaction interface. A transponder which transmits information originating in a peripheral device shall be able to receive bits or bit patterns for insertion at appropriate locations within the transmission. These locations shall not include those into which bit patterns generated internally by the transponder are inserted, nor the AP field of the reply. A transponder which transmits information using the Comm-B format shall have immediate access to requested data in the sense that the transponder shall respond to an interrogation with data requested by that interrogation. Note.— This requirement may be met in two ways:

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