Electronics > Repair

Symmetricom NTS-200 Time Server

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uncle_bob:
Hi

One gotcha with an external "fix" for a rollover shows up when a leap second comes along. The firmware *expects* to apply it at the end of December or end of June based on the standards that apply. The problem is, the device no longer is correct when it looks at the date. What it thinks is June is no longer June. In some cases things work ok. In other cases ...errr .... not so much.

Bob

edpalmer42:

--- Quote from: uncle_bob on March 03, 2019, 05:43:23 pm ---Hi

One gotcha with an external "fix" for a rollover shows up when a leap second comes along. The firmware *expects* to apply it at the end of December or end of June based on the standards that apply. The problem is, the device no longer is correct when it looks at the date. What it thinks is June is no longer June. In some cases things work ok. In other cases ...errr .... not so much.

--- End quote ---

If that happens, it can be patched.  No, it isn't an ideal solution, and it likely isn't possible for a closed source device like a Symmetricom server, but it's practical for some situations.

Ed

fira4:

--- Quote from: MonarkeIV on March 03, 2019, 01:13:29 pm ---I know this topic is 120 days past, but I found a notice from Microsemi that apparently it's the Symmetricom TS2100 which has the Decade Rollover Bug. 

http://www.heoldesign.com/IMG/pdf/heol-tech_note_119_en_r02.pdf

In case the link becomes invalid, I'll also attached the notice file.  :popcorn:

--- End quote ---
i have 2 unit  NTS-200 up and running till now, does this type impacted with gps rollover bug?

b0bd:
fira4 or anyone else,

anyone been affected by the GPS rollover bug, in that their NTS-200 now thinks its April of 2000. Took me a while to realize why my local clocks were suddenly an hour off. A couple of other servers that are available on the internet have the same issue.

workaround for now is unplug the antenna and configure ntp servers.

fira4:

--- Quote from: b0bd on December 30, 2019, 07:03:08 pm ---fira4 or anyone else,

anyone been affected by the GPS rollover bug, in that their NTS-200 now thinks its April of 2000. Took me a while to realize why my local clocks were suddenly an hour off. A couple of other servers that are available on the internet have the same issue.

workaround for now is unplug the antenna and configure ntp servers.

--- End quote ---
Yep, its reset to 2000.

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