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NOUS40 KWBC 121503
NOAAPORT NOTICE NO. 1118 SEPTEMBER 12... 1997
SUBJECT IMPENDING CHANGES IN NOAAPORT SATELLITE BROADCAST
SYSTEM
THIS IS AN UPDATE ON THE STATUS OF CERTAIN CHANGES TO BE MADE
IN THE NOAAPORT SATELLITE BROADCAST SYSTEM. PREVIOUS
E-MAILINGS HAVE PROVIDED ADVANCE INFORMATION ON THE PROPOSED
INTRODUCTION OF THE REED-SOLOMON FORWARD ERROR CORRECTION
CODING SCHEME AND THE CAPABILITY FOR DATA PRODUCT
RETRANSMISSION. BOTH OF THESE FEATURES WILL BE INTRODUCED
BUT THEIR SCHEDULED RELEASE DATE HAS BEEN DELAYED.
THE ORIGINAL SCHEDULE FOR CONVERSION TO THE REED-SOLOMON
CODING SCHEME CALLED FOR A TRANSITION DURING
SEPTEMBER 1997. DELAYS HAVE BEEN ENCOUNTERED HOWEVER
IN THE MANUFACTURE OF THE REPLACEMENT DEMODULATOR /EFDATA
MODEL SDR54A/ REQUIRED TO MODIFY THE RECEIVING SYSTEMS.
TO ALLOW SUFFICIENT TIME FOR TESTING OF THE PRODUCTION MODELS
OF THE DEMODULATOR AND TO AVOID INTERFERING WITH OTHER
AWIPS TEST ACTIVITIES IT HAS BEEN DECIDED TO DEFER THE
TRANSITION TO THE REED-SOLOMON CODING UNTIL LATE
NOVEMBER 1997 WITH THE EXACT SCHEDULE TO BE ANNOUNCED
LATER.
THE NOAAPORT BROADCAST SYSTEM REFERENCE DOCUMENTATION
IS BEING UPDATED TO PROVIDE TECHNICAL DETAILS ON THE
REED-SOLOMON CODING AND ALL OTHER CHANGES WHICH
HAVE BEEN MADE IN THE SYSTEM DESIGN AND WHEN PUBLISHED
MAY BE DOWNLOADED FROM THE NOAAPORT WEB SITE ON THE
INTERNET. THE ORIGINAL DOCUMENTATION IS STILL AVAILABLE
ON THE PRESENT ADDRESS FOR THE WEB SITE AT
HTTP //WWW.NNIC.NOAA.GOV/NOAAPORT/HTML/NOAAPORT.HTML
NOTE HOWEVER THAT THIS INTERNET ADDRESS WILL BE CHANGED
IN THE NEAR FUTURE AND THE NEW ADDRESS WILL BE POSTED AT THE
PRESENT SITE AND ALSO PROVIDED IN A FUTURE MAILING. THE
NEW WEB SITE WILL BE ESTABLISHED COINCIDENT WITH THE REVISED
REFERENCE DOCUMENTATION.
THE AWIPS SOFTWARE RELEASE 2.1 WILL MAKE IT POSSIBLE FOR
AWIPS FIELD SITES TO REQUEST RETRANSMISSION OF MISSING
SATELLITE BROADCAST NETWORK /SBN/ DATA PRODUCTS FROM THE
AWIPS NETWORK CONTROL FACILITY /NCF/ AND TO RECEIVE THE
RETRANSMITTED PRODUCTS VIA THE SBN. REQUESTS FOR
RETRANSMISSION WILL BE SENT FROM THE FIELD SITES OVER THE
AWIPS WIDE AREA NETWORK /WAN/. WHILE NRS USERS WILL NOT BE
ABLE TO REQUEST RETRANSMISSION OF PRODUCTS THEY SHOULD
BE AWARE OF THIS NEW FEATURE BECAUSE IT WILL OCCASIONALLY
RESULT IN DUPLICATED PRODUCTS BEING RECEIVED.
RELEASE 2.1 HAS ALREADY BEEN INSTALLED IN SOME OF THE
AWIPS FIELD SITES BUT WILL NOT FUNCTION UNTIL A COMPANION
SOFTWARE UPGRADE IS MADE IN THE NCF. THE NCF UPGRADE
ORIGINALLY SCHEDULED FOR INSTALLATION IN AUGUST HAS NOW
BEEN DEFERRED TO LATE SEPTEMBER WITH THE TRANSITION TO
FULL OPERATION TO FOLLOW. A FURTHER MAILING ON
THIS WILL BE PROVIDED WHEN A FIRM SCHEDULE FOR THE
TRANSITION BECOMES AVAILABLE.
END
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