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267
NOUS40 KWBC 312209
NOAAPORT NOTICE NO. 1134 OCTOBER 31... 1997
PART 1 OF A 2 PART MESSAGE
ATTN NOAAPORT USERS
SUBJECT SCHEDULE FOR MODIFICATIONS TO NOAAPORT
SATELLITE BROADCAST SYSTEM
PREVIOUS E-MAILINGS HAVE PROVIDED ADVANCE INFORMATION ON
THE PROPOSED INTRODUCTION OF THE REED-SOLOMON FORWARD
ERROR CORRECTION CODING SCHEME WITH DETAILS ON THE CODING
PARAMETERS. THE EFDATA MODEL SDR54A DEMODULATOR WHICH IS
AN IMPLEMENTATION OF THE REED-SOLOMON CODING HAS UNDERGONE
PRELIMINARY LABORATORY AND FIELD TESTING WITH GOOD RESULTS.
IT IS NOW PROPOSED TO PROCEED WITH CONVERSION OF THE NOAAPORT
SATELLITE BROADCAST SYSTEM TO THE NEW CODING ON A PHASED
TRANSITION WITH CHANNELS MOVING TO NEW FREQUENCIES AS THE
NEW CODING IS INTRODUCED. THE THREE NOAAPORT CHANNELS
CURRENTLY CARRYING TRAFFIC ALL AT A 1.536 MBPS DATA RATE
ARE IDENTIFIED AS NWSTG GOES EAST AND GOES WEST. THERE IS AN
ADDITIONAL CHANNEL AT A 768 KBPS DATA RATE NOW BEING USED
FOR TEST PURPOSES WHICH WILL IDENTIFIED HEREIN AS SPARE .
THE INITIAL CHANNEL FREQUENCY ALLOCATION DATA FOR ALL
DOWNLINKS IS
NWSTG CARRIER 3994.1250 MHZ IF 1155.875 MHZ
BANDWIDTH 1400 KHZ
GOES-E CARRIER 3995.525 MHZ IF 1154.475 MHZ
BANDWIDTH 1400 KHZ
GOES-W CARRIER 3990.225 MHZ IF 1159.755 MHZ
BANDWIDTH 1400 KHZ
SPARE CARRIER 3991.275 MHZ IF 1158.725 MHZ
BANDWIDTH 700 KHZ
AFTER THE TRANSITION IS COMPLETED THE FINAL FREQUENCY
ALLOCATION DATA FOR ALL DOWNLINKS WILL BE
NWSTG CARRIER 3990.150 MHZ IF 1159.850 MHZ
BANDWIDTH 1550 KHZ
GOES-E CARRIER 3994.050 MHZ IF 1155.950 MHZ
BANDWIDTH 1550 KHZ
GOES-W CARRIER 3991.700 MHZ IF 1158.300 MHZ
BANDWIDTH 1550 KHZ
SPARE CARRIER 3992.875 MHZ IF 1157.125 MHZ
BANDWIDTH 800 KHZ
END
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559
NOUS40 KWBC 312210
NOAAPORT NOTICE NO. 1134 OCTOBER 31... 1997
PART 2 OF A 2 PART MESSAGE
ATTN NOAAPORT USERS
SUBJECT SCHEDULE FOR MODIFICATIONS TO NOAAPORT
SATELLITE BROADCAST SYSTEM
THE TRANSITION TO THE USE OF REED-SOLOMON DEMODULATORS AT
AWIPS SITES WILL BE ACCOMPLISHED IN FOUR PHASES. AT EACH
PHASE TRANSMISSION WILL BE IN PARALLEL ON THE ORIGINAL CARRIER
FREQUENCY FOR RECEPTION USING THE ORIGINAL DEMODULATORS AS
WELL AS A NEW FREQUENCY FOR RECEPTION BY AWIPS SITES WHICH HAVE
BEEN CONVERTED TO THE NEW REED-SOLOMON DEMODULATORS. AT THE
SUCCESSFUL CONCLUSION OF THE PHASE THE TRANSMISSION ON THE
ORIGINAL FREQUENCY WILL BE DISCONTINUED. IF DIFFICULTY IS
EXPERIENCED AT ANY PHASE THE CONVERSION WILL BE PLACED ON
HOLD UNTIL THE PROBLEM CAN BE CORRECTED.
THE FOLLOWING IS THE PROPOSED TRANSITION SCHEDULE
PHASE 1 SPARE CHANNEL WILL BE OPERATED ON REED-SOLOMON
CODING ON 29 OCTOBER 97 AND TESTED UNTIL
4 NOVEMBER 97. IF NO PROBLEMS ARE EXPERIENCED
PROCEED TO PHASE 2. SPARE DATA WITH
NON-REED-SOLOMON CODING WILL NO LONGER BE
AVAILABLE ON THE INITIAL CHANNEL AFTER THIS TIME.
PHASE 2 GOES-W CHANNEL CONVERTED ON 4 NOVEMBER 97 AND
TESTED UNTIL 6 NOVEMBER 97. IF NO PROBLEMS ARE
EXPERIENCED PROCEED TO PHASE 3. GOES-W DATA WITH
NON-REED-SOLOMON CODING WILL NO LONGER BE
AVAILABLE ON THE INITIAL CHANNEL AFTER THIS TIME.
PHASE 3 NWSTG CHANNEL CONVERTED ON 13 NOVEMBER 97 AND
TESTED UNTIL 18 NOVEMBER 97. IF NO PROBLEMS ARE
EXPERIENCED PROCEED TO PHASE 4. NWSTG DATA WITH
NON-REED-SOLOMON CODING WILL NO LONGER BE
AVAILABLE ON THE INITIAL CHANNEL AFTER THIS TIME.
PHASE 4 GOES-E CHANNEL CONVERTED ON 18 NOVEMBER 97 AND
TESTED UNTIL 19 NOVEMBER 97. GOES-E DATA WITH
NON-REED-SOLOMON CODING WILL NO LONGER BE
AVAILABLE ON THE INITIAL CHANNEL AFTER THIS TIME.
END
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