<p> TABLE I-9 – Line-of-sight annual attenuation statistics at optical wavelengths+</p><p>Path number ______RX polatisation (L/C/U) _ RX polarisation tilt angle  (degrees) _ _ _  _ _ Transmit station t RX integration time (s) _ _ _ _ TX site name ______(1) RX max. measureable fade depth (dB) _ _ . _ TX country _ _ TX latitude (–90..+90) (degrees) _ _ _  _ _ _ _ Measurement: Experiment No. _ _ _ TX longitude (0..360) (degrees) E _ _ _  _ _ _ _ Data sampling interval (s) _ _ _ _  _ _ _ TX altitude amsl hgt (m) _ _ _ _ Calibration interval (days) _ _ _  _ _ TX height above ground ht (m) _ _ _ Data resolution (dB) _ _  _ _ _ TX power (dBm) _ _ _  _ Rain gauge (RG) type ______2 TX optical aperture ATX (m ) _  _ _ RG resolution (mm/h) _ _ _  _ _ _ TX horizontal beam divergence angle h (mrad) _ _ _ RG integration time (s) _ _ _ _ TX vertical beam divergence angle v (mrad) _ _ . _ _ RG location relative to receiver ______TX polatisation (L/C/U) _ Snow gauge (SG) type ______TX polarisation tilt angle t (degrees) _ _ _  _ _TX wavelength SG resolution (mm/h) _ _ _  _ _ _  (nm) _ _ _ _ SG integration time (s) _ _ _ _ Receive station SG location relative to receiver ______RX site name ______(1) Visibility Sensor (VS) type ______</p><p>RX country _ _ VS resolution (m) _ _ _  _ _ _  RX latitude (–90..+90) (degrees) ______VS integration time (s) _ _ _ _  _  RX longitude (0..360) (degrees) E ______VS location relative to receiver ______RX altitude amsl hgt (m) _ _ _ _ RX height above ground h (m) _ _ _ Path length l (km) _ _ _ _  _ _ t (2) 2 Environment _ _ RX optical aperture ARX (m ) _  _ _ RX horizontal beam divergence angle h (mrad) _ _  _ _ _ Start date (yyyy.mm.dd) _ _ _ _  _ _  _ _</p><p>RX vertical beam divergence angle v (mrad) _ _  _ _ End date (yyyy.mm.dd) _ _ _ _  _ _  _ _ Duration d (days) (3) _ _ _ _  _ _ _</p><p>Table: (4) Optical attenuation (dB) and atmospheric conditions exceeded for percentage of time (average year) 0.001 0.002 0.003 0.005 0.01 0.02 0.03 0.05 Percentage of time (%) 0.1 0.2 0.3 0.5 1 2 3 5 10 20 30 50 60 70 80 90 ------Attenuation (all factors) ------Attenuation (fog only) ------Attenuation (snow only) ------Attenuation (rain only) ------Visibility (m) ------Snow rate (rainfall equivalent) (mm/h) ------Rain rate (mm/h) ------References:</p><p>Comments:</p><p>+ In addition to the tables provided in this document the submitter is requested to provide the data files according to the instructions available on ITU-R SG 3 Web page: Study Group 3 databanks - DBSG3.</p><p>D:\DOCS\2018-04-12\08B1DA2A5ABD3E064B0F103C22113331.DOC - 2 - 3M/123(Annex 11)-E</p><p>(1) Use ISO 3166-1 alpha-2 country codes. (2) See Annex 3 for types of environment.</p><p>(3) Duration is the total time of valid measurements for this dataset, expressed as a real number (e.g. 339.888 days). The ratio of duration to the period identified by the start and the end dates of this dataset is the availability (e.g. start=2001/1/1, end=2001/12/31, duration= 339.888 days corresponds to 93.12 % availability).</p><p>(4) Submissions should comply with the acceptance criteria specified in Rec. ITU-R P.311.</p><p>D:\DOCS\2018-04-12\08B1DA2A5ABD3E064B0F103C22113331.DOC </p>