SEXX01 PHEB 100345
TO    HONG KONG OBSERVATORY
      JMA, TOKYO
      ALASKA TSUNAMI WARNING CENTER
      CENTRE POLYNESIEN DE PREVENTION DES TSUNAMI
      NAT. MET. OPS. CENTRE, MELBOURNE
      PACIFIC TSUNAMI WARNING CENTER
 
 
-- ANNOUNCEMENT OF MESSAGING CHANGE FROM PTWC--
 
THE PACIFIC TSUNAMI WARNING CENTER WILL SOON
START SENDING EARTHQUAKE OBSERVATORY MESSAGES OVER 
THE AFTN CIRCUIT BY A NEW METHOD.  ONE CONSEQUENCE 
OF THIS CHANGE IS THAT MESSAGES WILL HAVE A
MODIFIED HEADER STRUCTURE.  FIRST, MESSAGES WILL
CONTAIN THE NEW HEADER 'SEXX01 PHEB', INDICATING 
THEY ORIGINATE FROM PTWC.  SECOND,INSTEAD OF THE 
PTWC ADDRESS 'PHEBYMYT', MESSAGES WILL CONTAIN THE 
ORIGINATION ADDRESS 'KWBCYMYX'.  FOR EXAMPLE, WHERE 
BEFORE A MESSAGE MIGHT CONTAIN THE HEADER LINE
 
         051800 PHEBYMYT
 
IN FUTURE THIS LINE WILL BE REPLACED BY TWO LINES
 
         051800 KWBCYMYX
         SEXX01 PHEB 051800
 
APART FROM THESE DIFFERENCES MESSAGES WILL BE IDENTICAL 
IN STRUCTURE TO THOSE YOU CURRENTLY RECEIVE.  FOR A 
SHORT PERIOD PTWC WILL SEND DUPLICATE MESSAGES USING 
BOTH FORMATS, BUT AS SOON AS IT IS CLEAR THAT THE NEW 
METHOD IS WORKING PTWC WILL STOP SENDING MESSAGES WITH 
THE OLDER FORMAT.
 
PLEASE CONTACT PTWC BY EMAIL AT COMMS@PTWC.NOAA.GOV 
IF YOU HAVE QUESTIONS OR CONCERNS ABOUT THIS CHANGE.  
THANK YOU.
STOP