Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 1923

b) with a likelihood of 0.9, it shall consider the channel unoccupied if the signal level is attenuated to below –92 dBm for at least 1.5 milliseconds. Note.— The maximum link throughput available to all users is highly sensitive to the RF channel sense delay (from the time when the channel actually changes state until a station detects and acts on that change) and RF channel seizure delay (from the time when a station decides to transmit until the transmitter is sufficiently ramped up to lock out other stations). Accordingly, it is imperative that all efforts are made to reduce those times as the state-of-the-art advances. 6.4.3.2.2 Channel idle to busy detection. With a likelihood of at least 0.9, a station shall consider the channel occupied within 1 millisecond after on-channel power rises to at least –90 dBm. 6.4.3.2.3 Recommendation.— The detection of an occupied channel should occur within 0.5 milliseconds. Note.— A higher probability of false alarm is acceptable on the idle to busy detection than the busy to idle detection because of the effects of the two different errors. 6.4.3.3 MODE 2 RECEIVER/TRANSMITTER INTERACTION 6.4.3.3.1 Receiver to transmitter turnaround time. A station shall transmit the training sequence such that the centre of the first symbol of the unique word will be transmitted within 1.25 milliseconds after the result of an access attempt is successful (see Figure 6-3). The total frequency change during the transmission of the unique word shall be less than 10 Hz. After transmission of the unique word, the phase acceleration shall be less than 500 Hz per second. 6.4.3.3.2 Transmitter to receiver turnaround time. The transmitter power shall be –20 dBc within 2.5 symbol periods of the middle of the final symbol of the burst. The transmitter power leakage when the transmitter is in the “off” state shall be less than –83 dBm. A station shall be capable of receiving and demodulating with nominal performance, an incoming signal within 1.5 milliseconds after transmission of the final information symbol. Note.— Reference DO-160D section 21, category H for antenna radiated signals. Part I Annex 10 — Aeronautical Communications I-6-13 22/11/07 6.4.3.4 MODE 2 PHYSICAL LAYER SYSTEM PARAMETERS 6.4.3.4.1 The physical layer shall implement the system parameters as defined in Table 6-4. 6.4.3.4.1.1 Parameter P1 (minimum transmission length). Parameter P1 defines the minimum transmission length that a receiver shall be capable of demodulating without degradation of BER. 6.4.4 Mode 3 specific physical layer Note.— The Mode 3 specific physical layer specification includes a description of Mode 3 management (M) burst and handoff check message (H) burst uplink, M burst downlink, voice/data (V/D) burst, and bit scrambling. 6.4.4.1 Management (M) burst and handoff check message (H) burst uplink. The M uplink burst (as contained in the Manual on VDL Mode 3 Technical Specifications) shall consist of three segments, the training sequence followed by the system data and the transmitter ramp down. The H uplink burst (as contained in the Manual on VDL Mode 3 Technical Specifications) shall consist of three segments, the training sequence followed by the handoff check message and the transmitter ramp down. 6.4.4.1.1 Training sequence. Uplink M burst and H burst training sequences shall consist of two components as follows:

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