[time-nuts] Symmetricom TruTime XL-DC date error
Russell Rezaian
rrezaian at motorola.com
Thu May 12 18:07:43 UTC 2011
Hi Pete,
I have a few of these boxes with various different firmware versions.
Some of the older boxes do have known issues with GPS week rollover
and I have seen things labeled on these boxes as Y2K fixes too.
For your particular box there is one setting I think MIGHT make a
difference for you.
Keypad function 68, or serial function F68 called "Year Entry" is
intended for GPS epoch management.
The interesting thing is that depending on you firmware version how
you set that parameter can have some unusual effects. On some
machins you need to set it to an incorrect number to force the epoch
calculations to work.
For most of my systems with new firmware setting the number correctly
works properly as expected.
For the NTS-100 systems, which are derived from the XL-DC, you
sometimes need to set the year to 1996 to get the correct year out of
the clock. I believe this is also true for some XL-DC firmware
versions.
On the serial port try typing "F68" and sending a CR. It should
reply with the current setting.
To set it, send "F68" a space, and then the year, followed by a CR.
Example "F68 2011" followed by CR.
Try checking how this is set now. If it shows the correct year, try
setting it back to 1996.
If neither of those work, you may be able to find an alternate value
that convinces the system to give you the correct value.
You should still be able to find the manual and GPS rollover
bulletins for these on the net. If not, copies can probably be found
in peoples archives.
--
Russell
At 10:46 AM -0700 2011/05/12, Peter Loron wrote:
>Hello, group. I've got a Symmetricom TruTime XL-DC, which appears to
>be working ok now that I have the proper antenna. However, it thinks
>the date is 2031.
>
>Is this a known firmware issue for these boxes?
>
>Thanks.
>
>-Pete
>
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