Symmetricom XLi IEEE 1588 User Manual

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This function is available through the command line interface only. It is not available from the keypad. 

Use function F9 to record the exact time the XLi receives a request from the user.

Enter the command "F9<CR>" to prepare the XLi for the user's request. At the desired moment, send 
the request to the XLi by entering an upper case "T". The XLi saves the current time-of-day, accurate to 
within 1

μS, to a buffer, and then outputs it to the command line interface. The XLi continues to provide 

the time-of-day each time it receives a "T" until F9 is cancelled. To cancel F9, enter Ctrl-C on your 
keyboard. The command line disregards all input other than SHIFT-T and Ctrl-C. 

The time-of-day output is only available on the network or serial port used to give the F9 command.

F9’s factory set output string is as follows:

<SOH>DDD:HH:MM:SS.mmmQ<CR><LF>

where:

The time quality character,  "Q",  is one of the following characters: 

For example, to prepare Time on Request, enter:

<SOH>

=  ASCII Start-of-Heading character

<CR>

=  ASCII Carriage Return character 

<LF>

=  ASCII Line Feed character 

YYYY

= year

DDD

= day-of-year.

HH

= hours.

MM

= minutes.

SS

= seconds.

mmm

= milliseconds.

:

= colon 

separator.

Q

=  time quality character (see the following table)

SPACE =  Time error is less than time quality flag 1's threshold

.

=  Time error has exceeded time quality flag 1's threshold

*

=  Time error has exceeded time quality flag 2's threshold

#

=  Time error has exceeded time quality flag 3's threshold

?

=  Time error has exceeded time quality flag 4's threshold, or a reference source is unavailable