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After making the telephone connection, the user should start by sending an ASCII carriage return character.To obtain the date, a user sends an ASCII upper case D followed by an ASCII carriage return character. the date on the Greenwich meridian) as a string YYMMDD followed by a carriage return, where YY is the last two digits of the year in the Gregorian calendar, MM is the number of the month (01-12), and DD is the day of the month (01- 31).
A telephone link with a loop delay of 0.25 - 0.29 s likely has been routed one way by satellite and overland the other way: such a link is uncommon and is not suitable for accurate time transfer.
Software that calls this service directly is also available commercially.
The protocol is an interactive one that uses pure ASCII character strings to give the date (YYMMDD format), time (UTC in hhmmss format) and telephone loop delay.
Other ranges of loop delay could indicate excessive digital buffering of the signals in the telephone link.
Correction for delays in user equipment also must be done if true millisecond time accuracy is desired, or calibrated automatic equipment may be purchased from Leitch Video Limited of Don Mills, Ontario.