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burst-to-burst frequency uncertainty of 230 Hz and maximum
channel rate accuracy deviation of 4.4.5.1.
4.3.4.3.2 CHAWL RATE OF 8.4 KBITS/S
4.3.4.3.2.1 Franze lock. The probability of failing to
achievc frame lock on the first unique word shall be less than
one in lo3 at an Es/No of 4.1 dB in a Gaussian channel,
including conditions of 4.3.3 a) and b), and with a maximum
burst-to-burst frequency uncertainty of a30 Hz and maximum
channel rate accuracy deviation of 4.4.5.1.
4.3.4.3.2.2 Fnlsc frum.e lock. The probability of false
frame lock shall be less than one in 104 lor an E,/No of 4.1 dB
in a Gaussian channel, including conditions of 4.3.3 a) and b),
and with a maximum burst-to-burst frequency uncertainty ol'
430 Hz and maximum channel rate accuracy deviation of
4.4.5.1.
4.3.4.3.2.3 Reacq~~isitiounf frurne lock. Upon the loss of
frame lock, it shall be acquired within 0.5 seconds at an Es/NO
of 4.1 dB, in 90 pcr cent of all cases, in a Gaussian channel,
including conditions of 4.3.3 a) and b), and with a maximum
burst-to-burst frequency uncertainty of 230 Hz and maximum
channel rate accuracy deviation of 4.4.5.1.
4.3.4.4 C CHANNEL GES
DEMODULATOR ACQUISITION
4.3.4.4.1 Channel rate of 21.0 kbits/s. In a Gaussian
channel,, and under the conditions of 4.3.3 a) and b), with a
hcquency offset of k600 Hz, and a clock frequency offset of
*0.5 Hz, the probability of failing to achieve frame lock on the
first unique word shall be less than 1 in lo3 at an Es/No of
1.7 dB. The probability of false frame lock shall be less than
1 in 1 0 b t an Es/No of 1.7 dB. Should frame lock be lost, it
shall be reacquired within 3.0 seconds, for 99 per cent of the
time, at an E,/No of 1.7 dB.
4.3.4.4.1 bis Clznrzrzel rute of 8.4 kbits/s. In a Gaussian
channel, and under the conditions of 4.3.3 a) and b), with a
hcquency ofi'sel of k600 Hz, and a clock frequency offset of
~ 0 . 5Hz , the probability of failing to achieve frame lock on the
first unique word shall be less than 1 in lo3 at an Es/No of
4.4 dB. The probability of false frame lock shall be less than
I in lo4 at an Es/No of 4.4 dB. Should frame lock be lost, it
shall be reacquired within 0.5 seconds, 90 per cent of the time,
at an E,/No of 4.4 dB.
1/11/01
No. 76
Part I Annex 10 - Aer~nautical Telecommunications
4.3.4.4.2 Other C channel rates. The probability of the 4.4.2.2.2 F o m t idcntifiel: This field shall consist of the 4
GES demodulator failing to achieve frame lack within 0.75 bits: 0001. Other values for this field are reserved for future USE.
seconds of the start of C channel transmission shall be less
than one in 10'. 4.4.2.2.3 Superframe boundary marker: This field shall
consist of 12 bits.
4.3.4.4.3 Recornmendation.- The GES 'denzodulator
should achieve C channel frame lock as soon as possible after - 4 bits to indicate the start of a new superframe
the start of C channel transmission. 1 11 1 for frame 0 in a superframe of 8 seconds
0000 for all remaining frames in the superframe
- 4 bits to indicate frame of superframe
4.4 CHANNEL FORMAT TYPES
AND RATES
0000,0001,0010,001 1 at 0.6 kbitsls
0000,0001 ,...., 01 11 at 1.2 kbitsls
0000,0001 ....., 11 11 at: 2.4 kbits/s and above
- 4 bits which repeat the previous 4 bits.
4.4.1 General
4.4.2.2.4 Durnmyfield. For chmnel rates above 2.4 kbitsfs
4.4.1.1 Aircrqfr system-timing- re- ference point. The this be:
reference timing point -for signals generated and received by
the AES shall be at the antenna. 16 bits for 4.8 kbits/s
178 bits for 10.5 kbitsfs
4.4.1.2 Channel rates. The channel rates as applicable to
The dummy field shall consist of the sequence 0001 repeated
the system capability levels defined in 4.1.3 shall be as shown
until the required number of bits is obtained.
in Table 4-9.
4.4.1.3 Signal units (SUs). All information to be
transmitted over the P, R, T and sub-band C channels shall be
in the format: of signal units. For the P, T and sub-band C
channel each signal unit shall consist of 96 bits. For the R
channel each signal unit shall consist of 152 bits. The signal
unit formats shall be as specified in Appendix 2.
4.4.1.3.1 Cyclic redundancy ciieck (CRC). The last two
bytes of each SU shall form a CRC of the SU. Any received
SU which fails the CRC shall be discarded.
4.4.1.3.2 Signal quality estimation. The AES shall make
infomation such as P channel degradation/loss and C channel
bit error rate available to the AES management functions and
GES management functions as appropriate.
4.4.2 P channel
4.4.2.1 Channel rate accuracy. The channel rate crror
　
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