B777-200 FLT CREW REPORTS LOSS OF SATCOM; DATALINK AND HF COM WHILE TRANSITING EDMONTON AND ARCTIC FIRS. SITUATION PARTIALLY RESOLVES ITSELF ALLOWING FLT TO CONTINUE TO DES.

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WHILE IN CRUISE; EICAS FOR NO DATALINK AND NO SATVOICE APPEARED. CONDITION CONTINUED FOR APPROX 30 MINS. FOLLOWED FLT MANUAL PROCS FOR INDICATIONS. COMS WERE WITH EDMONTON CTR AND REGULAR POS RPTS WERE BEING MADE ON VHF. AFTER UNSUCCESSFUL ATTEMPTS TO RESTORE DATALINK/SATVOICE WERE ATTEMPTED; CREW INITIATED MULTIPLE ATTEMPTS TO REACH COMPANY USING VARIOUS HF FREQS. EDMONTON CTR ADVISED THAT THEY HAD NO WAY OF PASSING OUR POS TO COMPANY. CREW WAS NOT SUCCESSFUL TRYING TO REACH COMPANY MAINT HF; CREW THEN CONTACTED ARCTIC RADIO AND PROVIDED POS RPT TO BE RELAYED TO COMPANY. INTERMITTENT PROB RESOLVED ITSELF WITHOUT CREW ACTION. CONTACTED COMPANY BY SATVOICE TO ADVISE SIT. COMPANY ADVISED THEY HAD BEEN ATTEMPTING TO REACH US FOR A PERIOD OF TIME AND WERE UNSUCCESSFUL. COMPANY ADVISED THAT THEY HAD ANOTHER ACFT TRYING TO REACH US AS WELL BUT NO XMISSIONS WERE HEARD FROM THAT FLT. ALSO RECEIVED A SELCAL FROM ANCHORAGE CTR SHORTLY AFTER REACHING COMPANY CONVEYING THAT THEY HAD ALSO BEEN TRYING TO REACH US TO PASS ALONG A POSSIBLE SOLUTION TO REMEDY THE NO DATALINK ISSUE. RPTED TO MAINT CTL THE PROB WE EXPERIENCED ONCE DATALINK WAS RESTORED. THEY ADVISE THAT THERE WAS A SIMILAR HISTORY OF THE SAME PROB ON RECORD. SENT NEW WRITE-UP VIA ACARS. CONTINUED FLT WITH ONLY MINOR DISRUPTION OF DATALINK/SATVOICE SYS.