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bandwidth of the first adjacent channel shall not exceed envimnmentalnoise souKes.
2 dBm.
6.3.4.2 The amount of power from a VDL airborne 6.3.5.3 Inferference immunio perjormance. The receiving
umsmitter under all operating when measured over function shall satisfy the specified error rate with a desired
the 25 bandwidth of the second adjacent channel sipal field strength of not more than 40 mi~r0~0lptesr metre
shdl be less than minus 25 dBm and from thereon it shall (minus 114 dBwlm2) and with undesired VHF DSB-AM or
monotonically decrease at the minimum rate of 5 d~ per W L Mode 2 signal on the adjacent or any other assignable
octave to a maximum value of minus 52 dBm. channel. at least 40 dB higher than the desired signal.
6.3.4.2.1 After 1 January 2002, the amount of power from 6.3.5.3.1 After 1 January 2002, the receiving function of
all new installations of a VDL airborne transmitter under all all new installations of VDL shall satisfy the specified error
operating conditions when measured over the 25 kHz channel rate with a desired signal field strength of not more than 40
bandwidth of the second adjacent channel shall be less than microvolts per metre (minus 114 dEiw/m2j and with an
minus 28 dBm. undesired VHF DSB-AM or VDL Mode 2 signal at least
60 dl3 higher than the desired signal on any assignable channel
6.3.4.2.2 After 1 January 2002, the amount of power from 100 kHz or more away from the assigned channel of the
all new installations of a VDL airborne transmitter under all desired signal.
Annex 10 - Aeronautical TeEecommunications Volume ZZI
Nore.- This level of interjerence immunity perfomunce c) data transmission by the transmitter: and
provides a receiver pe~ormance consistent with the influence
of the VDL RF spectrum mask as speczjied in Volume 111, d) notification services.
Part I, 6.3.4 with an effective isolation transmitter/receiver
isolation of 69 dB. Better transmitter and receiver 6.4.1.1.1 Transmittcr/receiver frequency control. The
performance could result in less isolation required. Guidance mL physical layer shall set or Rceiver
material on the measurement technique is included in lrequency as commanded by the link management entity
Annex 10, Volume Attachment A, section 7.
&ME).
6.3.5.3.2 After 1 January 2005, the receiving function of
all installations of M L shall meet the provisions of 6.3.5.3.1, Note.- The LME is a Link layer entiry specrjied in 6.5.
subject to the conditions of 6.3.5.3.3.
6.4.1.1.2 Data reception by the receiver. Signals received
6.3.5.3.3 Requirements of mandatory compliance of the shall be decoded so that they may be accurately read at the
provisions of 6.3.5.3.2 shall be made on the basis of regional higher layers.
air navigation agreements which specify the airspace of
operation and the implementation timescales. The agreement 6.4.1.1.3 Data ' transmission. The VDL physical layer
shall provide for at least two years' notice of mandatory shall appropriately encode the data received from the data link
compliance of airborne systems. layer and transmit it over the RE channel.
6.3.5.4 INTERFERENCE
IMMUNITY PERFORMANCE
6.3.5.4.1 The receiving function shall satisfy the specified
error rate with a desired field strength of not more than 40
microvolts per metre, and with one or more out-of-band
signals, except for VWF FM broadcast signals, having a total
level at the receiver input of minus 33 dBm.
Note.- In areas where adjacent higher band signal
irrreveference exceeds this specijication, a higher immunity
requirement will apply.
6.3.5.4.2 The receiving fur~ctions hall satisfy the specified
error rate with a desired field strengtk of not more than 40
nlicrovolts per metre, and with one or more VHF FM
broadcast signals having a total level at the receiver input of
minus 5 dBm.
6.4 PHYSICAL LAYER
PROTOCOLS AND SERVICES
6.4.1.1.4 ~otifcation services. The operational
parameters of the equipment shall be monitored at the physical
layer. Signal quality analysis shall be performed on the
demodulator evaluation process and on the receive evaluation
process; this analysis shall be normalized between a scale of 0
and 15, where 0 to 3 is considered poor, 4 to 12 is adequate,
and 13 to 15 is excellent.
Note.- Processes that may be evaluated in the
demodulator include BER, SNR, and timing jitter: Processes
that may be evaluated in the receiver include received signal
level and group delay.
6.4.1.1.4.1 Recommendation.- The sigwl qualify
annlysis should be based on received signal strength.
6.4.2 Mode 1 frames
6.4.2.1 To transmit a sequence of frames, a station shall
insert the bit numbers and flags (as per 6.5.3.3. I), prepend the
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