Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2104

c) interworking function. 11.3.4.3.1 HFSND FUNCTION The HFSND function shall perform the HFSND protocol between each pair of HFDL aircraft station subsystems and HFDL ground station subsystems by exchanging HFNPDUs. It shall perform the HFSND protocol aircraft function in the HFDL aircraft station subsystem and the HFSND protocol ground function in the HFDL ground station subsystem. 11.3.4.3.2 SUBNETWORK ACCESS FUNCTION The subnetwork access function shall perform the ISO 8208 protocol between the HFDL aircraft station subsystem or HFDL ground station subsystem and the attached routers by exchanging ISO 8208 packets. It shall perform the ISO 8208 DCE function in the HFDL aircraft station subsystem and the HFDL ground station subsystem. 11.3.4.3.3 INTERWORKING FUNCTION The interworking function shall provide the necessary harmonization functions between the HFSND, the subnetwork access and the connectivity notification functions. 11.4 GROUND MANAGEMENT SUBSYSTEM Note.— Details on the ground management subsystem functions and interfaces are contained in the Manual on HF Data Link (Doc 9741). 11.4.1 Management functions The ground management subsystem shall perform the functions necessary to establish and maintain communications channels between the HFDL ground and aircraft station subsystems. 11.4.2 Management/control information exchange The ground management subsystem shall interface with the ground station subsystem in order to exchange control information required for frequency management, system table management, log status management, channel management, and quality of service (QOS) data collection. Part I Annex 10 — Aeronautical Communications I-11-11 22/11/07 TABLES FOR CHAPTER 11 Table 11-1. Transfer delays Direction Priority Delay To-aircraft 7 through 14 45 s Transit delay From-aircraft 7 through 14 60 s To-aircraft 11 through 14 7 through 10 90 s 120 s Transfer delay (95 percentile) From-aircraft 11 through 14 7 through 10 150 s 250 s Table 11-2. Value of M and information data rate M Information data rate (bits per second) 300 or 600 1 200 1 800 Note.— When M equals the value 2, the data rate may be 300 or 600 bits per second as determined by the channel coding rate. The value of M may change from one data transmission to another depending on the data rate selected. The channel coding rate is described in the Manual on HF Data Link (Doc 9741). Table 11-3. HF signal-in-space conditions Data rate (bits per second) Number of channel paths Multipath spread (milliseconds) Fading bandwidth (Hz) per CCIR Report 5492 Frequency offset (Hz) Signal to noise ratio (dB) in a 3 kHz bandwidth MPDU size (octets) 1 200 1 fixed – – 1 800 2 fading 1 200 2 fading 11.5 2 fading 2 fading Annex 10 — Aeronautical Communications Volume III 22/11/07 I-11-12 Table 11-3a. HF signal-in-space conditions Data rate (bits per second) Number of channel paths Multipath spread (milliseconds) Fading bandwidth (Hz) per CCIR Report 5492 Frequency offset (Hz) Signal to noise ratio (dB) in a 3 kHz bandwidth MPDU size (octets) 1 200 2 fading 1 200 2 fading 11.5 Part I Annex 10 — Aeronautical Communications I-11-13 22/11/07 FIGURE FOR CHAPTER 11 Figure 11-1. Required spectrum limits (in terms of peak power) for HFDL aircraft and ground station transmitters ___________________ HFDL assigned frequency 1 400 Hz 1.5 kHz 4.5 kHz 4.5 kHz 7.5 kHz 7.5 kHz 1.5 kHz SSB carrier (reference) frequency -30 dB -38 dB  

Source: https://magyarkozlony.hu/hivatalos-lapok/bfd0d67db9f223889f627fd618725b03526630e2/dokumentumok/d5234fd7275da04023366ab8a434989962a31bdf/letoltes