710
NOUS71 KNCF 031721
ADANCF
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SUBJECT: AWIPS SATELLITE BROADCAST NETWORK CUTOVER FROM
SN-IV TO GE-4 SPACECRAFT
GE AMERICOM IS PREPARING TO TRANSFER ALL C-BAND
TRANSMISSIONS FROM THE OLD SPACENET-IV SATELLITE TO THE NEW
GE-4 SATELLITE. APPROXIMATELY TWO WEEKS AGO, GEA MOVED ALL
OF THEIR KU-BAND SERVICE TO THE NEW SATELLITE WITHOUT ANY
PROBLEMS, AND THE NEW SATELLITE CONTINUES TO BE STABLE.
THE AWIPS SBN IS ONLY ONE OF MANY USERS ON THE C-BAND
TRANSPONDERS.
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GEA WILL PERFORM THE CUTOVER OF THE TRANSPONDER FOR ALL
FOUR AWIPS SBN CHANNELS ON 04 JANUARY 2000 SOMETIME BETWEEN
0500Z AND 0900Z. THE ACTUAL TRANSPONDER CUTOVER WILL
AFFECT THE AWIPS BROADCAST FOR 30 TO 120 SECONDS. DURING
THIS PERIOD, SOME GARBLING OF AWIPS DATA COULD OCCUR.
GOES-E, GOES-W, AND NON-GOES PRODUCT CHANNELS DATA DROPOUTS
MAY BE SEEN ON PRODUCTS TRANSMITTED DURING THE CUTOVER.
ANY NWSTG PRODUCTS THAT ARE GARBLED DURING THE CUTOVER WILL
BE AUTOMATICALLY RETRANSMITTED, SO NO DATA LOSS SHOULD
OCCUR.
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IF GEA ENCOUNTERS A PROBLEM DURING THE CUTOVER, THEY WILL
REVERT BACK TO SN-IV UNTIL THE PROBLEM IS CLEARED. DYNCORP
(FORMERLY GTE) ENGINEERS WILL BE AT THE AWIPS MASTER GROUND
STATION DURING THE PROCESS. BOTH DYNCORP AND NCF ENGINEERS
WILL BE MONITORING UPLINK AND DOWNLINK OPERATIONS
THROUGHOUT THE CUTOVER. THE NCF WILL TRANSMIT AN ADMIN
MESSAGE VIA THE WAN AND SBN IF ANY PROBLEMS OCCUR. A FINAL
MESSAGE WILL BE SENT WHEN THE CUTOVER HAS BEEN SUCCESSFULLY
COMPLETED.
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