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Time sync for Domain and Phone system

Posted on 2010-11-19
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Last Modified: 2012-06-27
I have a Windows 2003 server acting as a DC. I have a mixed network of Windows XP and WIndows 7 Pro computers. I also have a Nortel BCM 400 Phone system. I need the network and phone system to keep precise time. Please advise the best way to do this.. I am not having any luck with the systems keeping go time.
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Question by:Goraps
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Expert Comment

by:XyPlan
ID: 34174090
On the Active Domain Controller you can force it to Sync with an external time source.

For example from a command prompt on the DC


net time "/setsntp:uk.pool.ntp.org"

Not sure of the Nortel BCM 400 but either sync that with the DC or use the same external time source.

if you have a domain logon script, you can sync with the domain time by including the following command (assuming its a batch file)

net time /set
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Author Comment

by:Goraps
ID: 34174176
Using that command will configure server to always go out to that server and sync time?  I am in Toronto Canada.
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Accepted Solution

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Chris Dent earned 2000 total points
ID: 34174326

You can replace uk with ca and you'll get a Canadian pool instead. It won't make much difference in the scheme of things.

I would use this command rather than net time:

w32tm /config /manualpeerlist:ca.pool.ntp.org

You only need configure that on the Domain Controller holding the PDC Emulator role (the current DC if you only have one). Time will be synchronising internally, it's required for AD domains.

Inside this KB Article you will find instructions on how to enable the NTP server portion of your Domain Controller:

http://support.microsoft.com/kb/816042

Refer to "Let me fix it myself" point 3. Once you've done that you can use your DC as a time-source for your Telephone System if they're both on the same network (and it lets you).

Chris
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Author Comment

by:Goraps
ID: 34196633
Chris-Dent,

 I have followed these steps... How can I test that it is working?
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Expert Comment

by:Chris Dent
ID: 34196736

The non-intrusive way would be to check the event logs for messages from Windows Time.

A more intrusive approach involved changing the time on your DC by a couple of minutes (no more than a couple, i.e. 2, and definitely no more than 5). Then run:

w32tm /resync

Verify that time corrects itself.

You can, in theory, do the same on your phone system. It should pick up the change from your DC.

Chris
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Author Comment

by:Goraps
ID: 34196773
I checked the event log first and I am getting this Error.

 TIME ERROR
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Expert Comment

by:Chris Dent
ID: 34196817

You missed a g off the end of the name :)

ca.pool.ntp.org

Chris
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Author Comment

by:Goraps
ID: 34196922
Ok that fixed the server end of things.... My server time is just under one min faster than my Clients / Phone system.
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Expert Comment

by:Chris Dent
ID: 34196976

On one of your clients run:

w32tm /resync /rediscover

By default it should pick up time from the server (PDC Emulator role holder).

The test above should give immediate results. But don't be too troubled if it takes a little while for the rest, NTP isn't instant, the client has to pull time, the server doesn't push.

Chris
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Author Comment

by:Goraps
ID: 34197027
Ran the command and got this error from Client:

 Client time error after running command
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Expert Comment

by:Chris Dent
ID: 34197068

Just to be sure, you're running this on one of the domain members? Not the server itself?

If so, would you try:

w32tm /query /source

Chris
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Author Comment

by:Goraps
ID: 34197083
This is one a WIn 7 workstation on the same domain.
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Expert Comment

by:Chris Dent
ID: 34197149
Just checking :)

Please can you run:

w32tm /config /syncfromflags:domhier /update
w32tm /resync /rediscover

If in doubt about the time source you can always run "w32tm /query /source".

Chris
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Author Comment

by:Goraps
ID: 34197630
Here is the screen shot from commands issued:
Source points to the proper internal DC.

 Commnads
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Expert Comment

by:Chris Dent
ID: 34197942

That looks much better :)

Chris
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Author Comment

by:Goraps
ID: 34198100
Do I have to do this on all workstations in the office?
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Expert Comment

by:Chris Dent
ID: 34198304

No, you might just give it some time, the option we set above is the default for domain members.

If you find they're not synchronising we do something to make them run it from a central location.

Chris
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Author Comment

by:Goraps
ID: 34198415
Ok thanks.. i have a mix bag of win7 / winxp workstations.

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Author Comment

by:Goraps
ID: 34198490
Is there a website that links to ca.pool.ntp.org ? I want to get a visual. We are on a cell phone service by Rogers and people are now asking why the Cell phone network is off by 30 or so seconds.
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Expert Comment

by:Chris Dent
ID: 34198595

hmm.. it's basically a network of volunteer organisations, this is the source:

http://support.ntp.org/bin/view/Servers/NTPPoolServers

If you want a greater degree of accuracy you might look for an OpenAccess Stratum-1 server from this list:

http://support.ntp.org/bin/view/Servers/StratumOneTimeServers

Stratum refers to the time-source (behind the server), Stratum-1 systems are typically directly connected to non-networked time sources (Stratum-0 time sources, such as Atomic Clocks). Stratum-2 take time from Stratum-1 over the network (Internet).

Chris
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