Masterclock GPSPCI Spécifications télécharger pdf (Page 41)

Appendix D

GPS Synchronization HOW-TO

1. Install the cards and connect the cables

2. Load the kernel modules: for GPS m/jointfilesconvert/486857/bgclock.o and clock card hslclock.o

3. Make sure that the modules for the GPS and the clock card are loaded and fully

functional:

• Check the ﬁle /var/log/messages to see if the modules are loaded properly

• For the clock card: use the script dump hslclock.sh to see if the clock is

counting

• For the GPS card: use the program m/jointfilesconvert/486857/bgstatus to see if the antenna is properly

connected and if the c ard is synchronized

4. Verify that the xinetd server is properly installed and put the conﬁguration for

hs daemon into /etc/xinetd.d/hs daemon Make sure you set the correct path to

the program hs daemon . This must be done on ALL computers in the system. You

might need root privileges to do this.

5. Make sure the clock is in the ”Read time” mode. Run the command:

clock_test 1 3

6. Make sure that the PPS thread is disabled. Run the command:

clock_test 1 1 4

7. Try to reset the clock manually:

• Open a window with dump hslclock

• In another window run these 2 commands, one after the other:

clock_test 1 1

clock_test 1 2

• See if the clock resets after these 2 commands

This test has to be made at all sites that need to be synchronized.

8. Open a terminal window for each of the computers in the system and a terminal

window for each of the maste r computers in the system.

1 2 ... 36 37 38 39 40 41 42 43 44

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Masterclock GPSPCI Spécifications Page 41