On Thu, 02 May 2019 00:29:32 -0400, Keith Wallace said:
> Good stuff, never had an issue with rollovers, software was upgradable.
Did the vendor ever ship an actual software upgrade?
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I'd like to give a plug for Symetricom products like the Time Provider 1100. I
used these in my previous life at a half dozen sites.
They function as ntp servers and peer with each other over a network. In
addition (and most important to me) they provided BITS clocks to our optical
gear and
On May 2, 2019, at 00:41, Alejandro Acosta
wrote:
>
> As other have commented before, it looks you need an outdoor antenna,
> however, reading the specs it says:
>
>
>
> “The built in high sensitivity GPS receiver is able to lock multiple
> satellites from within multiple buildings or
For those wondering what a GPS certification letter for the rollover bug looks
like, here’s Garmin’s. Note the phrase “for many years, Garmin has anticipated
and prepared for this event...”:
Garmin GPS Week Number Rollover Statement
What is the GPS Week Number Rollover (WNRO)?
The GPS system
I’m talking about _my_ GPS server. I have no idea what you’ve cobbled up :)
-mel
> On May 1, 2019, at 8:41 PM, Gary E. Miller wrote:
>
> Yo Mel!
>
> On Thu, 2 May 2019 03:35:31 +
> Mel Beckman wrote:
>
>> I can tell you how the GPS server behaves when it loses it signal: it
>> stops
Gary, Gary, Gary,
You don’t need a $30,000 GPS simulator to verify if a GPS product in your
inventory has the rollover bug. You simply ask the supplier to certify that
they don’t have the rollover bug. They use their _$100,000_ GPS simulator If
needed, but usually it’s done with a trivial code
Yo Mel!
On Thu, 2 May 2019 03:35:31 +
Mel Beckman wrote:
> I can tell you how the GPS server behaves when it loses it signal: it
> stops giving out verified time and lapses into Stratum-“goners” mode.
I happen to have a few GPS in my lab that do not agree with your
statement. I'll spare
Yo Mel!
On Thu, 2 May 2019 03:30:03 +
Mel Beckman wrote:
> I’m also an FAA licensed A mechanic, and have worked for airlines
> in fleet maintenance. Air carriers have extremely thorough systems
> reviews, by law, through the Airworthiness Directive program, which
> started identifying 2019
I can tell you how the GPS server behaves when it loses it signal: it stops
giving out verified time and lapses into Stratum-“goners” mode. But today’s RTP
chips don’t start losing seconds-per-day when they are free running. Typically
they might lose ten seconds per week on cheap systems.
Yo Gary!
Not only did I not sleep through it, I was one of the engineers who verified
that every GPS clock source in a very large aviation support network didn’t
have have this bug.
I’m also an FAA licensed A mechanic, and have worked for airlines in fleet
maintenance. Air carriers have
On 5/1/19 7:54 PM, Mel Beckman wrote:
> Harlan,
>
> Why? The GPS NTP Server is Stratum-1. If it fails computer clocks will
> freewheel for hours or days before losing significant time, during which
> period you can simply order a replacement unit. If that isn’t fast enough,
> buy two $300
Yo Mel!
On Thu, 2 May 2019 02:54:25 +
Mel Beckman wrote:
> Why? The GPS NTP Server is Stratum-1. If it fails computer clocks
> will freewheel for hours or days before losing significant time,
> during which period you can simply order a replacement unit. If that
> isn’t fast enough, buy
Harlan,
Why? The GPS NTP Server is Stratum-1. If it fails computer clocks will
freewheel for hours or days before losing significant time, during which period
you can simply order a replacement unit. If that isn’t fast enough, buy two
$300 boxes. The “consensus” issue is moot, since a GPS
Hi Keith,
On 5/1/19 6:17 PM, Keith Medcalf wrote:
>
>> If your network is air gapped from the Internet then sure. If it's
>> not, you can run NTP against a reasonably reliable set of time
>> sources (not random picks from Pool) and be able to say, "my log
>> timestamps are accurate to +/- 10
On 5/1/19 5:55 PM, William Herrin wrote:
> On Wed, May 1, 2019 at 5:48 PM Keith Medcalf wrote:
>
>> If you have one such installation, then you really do not care about the
>> "accuracy" of the time. However if you have multiple such installations
>> then you want them all to have the same
> On May 1, 2019, at 9:45 PM, Harlan Stenn wrote:
>
>
>
> On 5/1/19 5:39 PM, William Herrin wrote:
>> On Wed, May 1, 2019 at 12:23 PM Mehmet Akcin wrote:
>>
>>> I am trying to buy a GPS based NTP server like this one
>>>
>>> https://timemachinescorp.com/product/gps-time-server-tm1000a/
>>>
On 5/1/19 4:28 PM, Mel Beckman wrote:
> Harlan and Mehmet,
>
> I can expand on one important reason that James only alluded to with his
> “Kepping the Auditors happy” comment.
>
> Passing NTP through a firewall and then using that as a critical time
> reference source represents a huge
On 5/1/19 4:53 PM, Mel Beckman wrote:
> Ask,
>
> But with a small compact server like the DC-powered TimeMachines Inc unit,
> which costs something like $300, you simply put the server where the
> visibility is and connect back to the nearest Ethernet port in your network,
> up to 300’
On 5/1/19 5:39 PM, William Herrin wrote:
> On Wed, May 1, 2019 at 12:23 PM Mehmet Akcin wrote:
>
>> I am trying to buy a GPS based NTP server like this one
>>
>> https://timemachinescorp.com/product/gps-time-server-tm1000a/
>>
>> but I will be placing this inside a data center, do these need
On Wed, May 1, 2019, at 19:19, Brandon Martin wrote:
> I've seen things like this when there's a sudden power loss across a
> small site e.g. a remote PoP. Think a loss of utility power and UPS
> fails to transfer for some unanticipated reason.
Or in our case, a Canada Goose lands on the
Stephen,
LOL. That’s not a real problem with today’s microprocessors. The TM1000A, for
example:
“...is capable of serving 135+ synchronizations per second.
That provides support for over 120,000+ devices updating
every 15 minutes on the network.”
As for ARP traffic deluges, if that’s
One word of caution when using a low-priced NTP appliance: your network
activity could overwhelm the TCP/IP stack of the poor thing, especially
if you want to sync your entire shop to it. In the case of the networks
I set up, I set up a VLAN specific to the NTP appliance and to the two
servers
>If your network is air gapped from the Internet then sure. If it's
>not, you can run NTP against a reasonably reliable set of time
>sources (not random picks from Pool) and be able to say, "my log
>timestamps are accurate to +/- 10 milliseconds so it must be you who
>is farked up." While my
On Wed, May 1, 2019 at 9:56 PM William Herrin wrote:
> On Wed, May 1, 2019 at 5:48 PM Keith Medcalf wrote:
>
>> If you have one such installation, then you really do not care about the
>> "accuracy" of the time. However if you have multiple such installations
>> then you want them all to have
On Wed, May 1, 2019 at 5:48 PM Keith Medcalf wrote:
> If you have one such installation, then you really do not care about the
> "accuracy" of the time. However if you have multiple such installations
> then you want them all to have the same time (if you will be comparing logs
> between them,
On Wednesday, 1 May, 2019 15:36, Harlan Stenn wrote:
>So I gotta ask, just as a reality check:
>- Why do folks want to have one or more NTP server masters that have
>at least 1 refclock on them in a data center, instead of having their
>data center NTP server masters that only get time over
Once upon a time, William Herrin said:
> You sure you need a GPS NTP server? You understand that if you do, you need
> two for reliability right
That'd be 3 - a man with 2 clocks never know what time it is! :)
--
Chris Adams
On Wed, May 1, 2019 at 12:23 PM Mehmet Akcin wrote:
> I am trying to buy a GPS based NTP server like this one
>
> https://timemachinescorp.com/product/gps-time-server-tm1000a/
>
> but I will be placing this inside a data center, do these need an actual
> view of a sky to be able to get signal or
On 5/1/2019 6:12 PM, Mike Hammett wrote:
Anyone know of a solution that doesn't require an external antenna, is
NEBS compliant, and has T1-type outputs for me to hook into my
Metaswitch gear?
You forgot 'world peace' in there too. :)
--
Brielle Bruns
The Summit Open Source Development
Anyone know of a solution that doesn't require an external antenna, is NEBS
compliant, and has T1-type outputs for me to hook into my Metaswitch gear?
-
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
Midwest-IX
http://www.midwest-ix.com
- Original Message
> On May 1, 2019, at 16:53, Mel Beckman wrote:
>
> It’s hard to consider messing with signal converters and pricey
> remotely-powered active antennas when you can solve the problem for $300. :)
As I said, it really depends on your requirements and expectations. :-)
For my “normal” use
Ask,
But with a small compact server like the DC-powered TimeMachines Inc unit,
which costs something like $300, you simply put the server where the visibility
is and connect back to the nearest Ethernet port in your network, up to 300’
away, or virtually any distance with fiber transceivers.
> On May 1, 2019, at 12:22, Mehmet Akcin wrote:
>
> I am trying to buy a GPS based NTP server like this one
>
> https://timemachinescorp.com/product/gps-time-server-tm1000a/
>
> but I will be placing this inside a data center, do these need an actual view
> of a sky to be able to get
Harlan and Mehmet,
I can expand on one important reason that James only alluded to with his
“Kepping the Auditors happy” comment.
Passing NTP through a firewall and then using that as a critical time reference
source represents a huge security risk. Here’s one detailed explanation of that
On 5/1/2019 4:17 PM, Brandon Martin wrote:
> On 5/1/19 7:03 PM, Harald Koch wrote:
>> Properly deployed NTP should calibrate the local hardware clocks to
>> prevent drift even during connectivity outages. (I'm talking both the
>> low resolution hardware clocks used for timing across power
On 5/1/19 7:03 PM, Harald Koch wrote:
Properly deployed NTP should calibrate the local hardware clocks to prevent
drift even during connectivity outages. (I'm talking both the low resolution
hardware clocks used for timing across power cycles and reboots, and the
oscillators used while the OS
On Wed, May 1, 2019, at 18:46, Brandon Martin wrote:
> Think about what might happen if you lost time sync as a result of the
> incident causing said connectivity outage. Depending on your time
> sources available, you might see rapid drift or, worst case, lose your
> time reference entirely
On Wed, May 01, 2019 at 02:35:58PM -0700, Harlan Stenn wrote:
> - Why do folks want to have one or more NTP server masters that have at
> least 1 refclock on them in a data center, instead of having their data
> center NTP server masters that only get time over the internet?
Answers to that
On 5/1/19 5:35 PM, Harlan Stenn wrote:
- Why do folks want to have one or more NTP server masters that have at
least 1 refclock on them in a data center, instead of having their data
center NTP server masters that only get time over the internet?
It can be extremely useful to have known-good
Hello,
As other have commented before, it looks you need an outdoor antenna,
however, reading the specs it says:
"The built in high sensitivity GPS receiver is able to lock multiple
satellites from within multiple buildings or from a window location*,
eliminating the requirement that an
Accurate timing is also often required for telco gear.
-
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
Midwest-IX
http://www.midwest-ix.com
- Original Message -
From: "Harlan Stenn"
To: nanog@nanog.org
Sent: Wednesday, May 1, 2019 4:35:58 PM
On 5/1/19 2:59 PM, Andreas Ott wrote:
> On Wed, May 01, 2019 at 02:35:58PM -0700, Harlan Stenn wrote:
>> - Why do folks want to have one or more NTP server masters that have at
>> least 1 refclock on them in a data center, instead of having their data
>> center NTP server masters that only get
On 30/04/2019 23:50, Mehmet Akcin wrote:
> 7018
Looking at https://peeringdb.com/net/674
o Raj K.
o Bryan G.
is listed as contact 'Role' => 'Policy' (same role as the peering@).
Have you mayhaps tried contacting those 2 people, yet?
(the roundabout way could be contacting the listed 'Role'
On Wed, May 01, 2019 at 02:35:58PM -0700, Harlan Stenn wrote:
> - Why do folks want to have one or more NTP server masters that have at
> least 1 refclock on them in a data center, instead of having their data
> center NTP server masters that only get time over the internet?
I had that discussion
Perhaps using a rubidium source instead of GPS ? The actual time can be
obtained thru NTP, all you actually need is a precision source to keep time
accurate thereafter.
Rubens
On Wed, May 1, 2019 at 4:24 PM Mehmet Akcin wrote:
> hey there Nanog,
>
> I am trying to buy a GPS based NTP server
So I gotta ask, just as a reality check:
- Why do folks want to have one or more NTP server masters that have at
least 1 refclock on them in a data center, instead of having their data
center NTP server masters that only get time over the internet?
- What % of data center operators provide time
Kinda sucks all the good 'backup' methods of time keeping are dwindling.
I've got a WWVB clock as well that I'd love to get hooked into my main
NTP server, but I worry they're going to finally kill that off in the
next year or so.
LORAN C clocks still have potential to work well too...
I looked before at who had spectrum allocations in the frequencies my boxes
supported. I then used Cell Mapper to figure out what technology was deployed
on that frequency. IIRC, both US Cellular and Verizon had basic CDMA running in
my area on those channels. Sprint was running LTE and 1x
On 5/1/2019 2:50 PM, Andreas Ott wrote:
If you can't get a good spot for an antenna, you could be on the lookout
for a CDMA NTP clock.
CDMA service is about to be retired in several places, please check
in your area before you install a "new" CDMA based time server.
Mehmet,
I use the TimeMachines unit a lot. Usually we deploy these near any outside
window, typically putting the box in the ceiling and the running the GPS
antenna on its 20’ cable (or whatever it is) down to the window glass. Test
different windows first before committing. Then use any of
I had inquired with Frontier about installing a GPS antenna and they said they
don't allow antennas of any kind attached to the building anymore. I didn't
pursue that any further. I didn't think to check what the signal strength was
inside.
-
Mike Hammett
Intelligent Computing
Hi,
On Wed, May 01, 2019 at 02:01:44PM -0600, Brielle Bruns wrote:
> If you can't get a good spot for an antenna, you could be on the lookout
> for a CDMA NTP clock.
CDMA service is about to be retired in several places, please check
in your area before you install a "new" CDMA based time
If you can't get a good spot for an antenna, you could be on the lookout
for a CDMA NTP clock.
https://endruntechnologies.com/products/ntp-time-servers
We've got one as a backup to our SyncServer S200. Doesn't need an
outdoor antenna as long as you can get a cellular signal in the DC.
thank you guys, looks like GPS based NTP is the way to go.
On Wed, May 1, 2019 at 3:36 PM Bryan Fields wrote:
> On 5/1/19 3:22 PM, Mehmet Akcin wrote:
> > hey there Nanog,
> >
> > I am trying to buy a GPS based NTP server like this one
> >
> >
On 5/1/19 3:22 PM, Mehmet Akcin wrote:
> hey there Nanog,
>
> I am trying to buy a GPS based NTP server like this one
>
> https://timemachinescorp.com/product/gps-time-server-tm1000a/
>
> but I will be placing this inside a data center, do these need an actual
> view of a sky to be able to get
Dear Mehmet,
On Wed, May 01, 2019 at 03:22:57PM -0400, Mehmet Akcin wrote:
> I am trying to buy a GPS based NTP server like this one
>
> https://timemachinescorp.com/product/gps-time-server-tm1000a/
>
> but I will be placing this inside a data center, do these need an
> actual view of a sky to
hey there Nanog,
I am trying to buy a GPS based NTP server like this one
https://timemachinescorp.com/product/gps-time-server-tm1000a/
but I will be placing this inside a data center, do these need an actual
view of a sky to be able to get signal or will they work fine inside a data
center
VeEx VePAL isn't a bad unit. Touchscreen with flip screen protector, fairly
rugged, rechargable battery, test results can be saved to USB I believe, fairly
quick to boot up. I have the ADSL2+ version, but I think they make a VDSL
version. It has no VOM functions though, so I separately use a
lhc> How much did it cost? :-)
valdis> I'm willing to guess US$6digits/mo. 5 digits if you qualified for
valdis> the quantity discount. :)
We used to charge $2500 install and $2500/month for a T1 with agreement
to not share or resell. It was something like double that if you wanted
to resell? We
On Tue, 30 Apr 2019 22:12:12 -0700, Large Hadron Collider said:
> How much did it cost? :-)
I'm willing to guess US$6digits/mo. 5 digits if you qualified for
the quantity discount. :)
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Description: PGP signature
We've got an EXFO Colt-250 and an EXFO CableSHARK P3. They're 10 - 15 years
old, but as far as I know they work. Practically, what am I missing out on by
not getting a newer tester?
I'd like the CableSHARK's features in a smaller unit, but it seems like we're
looking at a minimum of $2k to
https://ifnetwork.biz/regional-map
-
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
Midwest-IX
http://www.midwest-ix.com
- Original Message -
From: "Jason Lixfeld"
To: "NANOG"
Sent: Wednesday, May 1, 2019 8:42:56 AM
Subject: Optical routes from
Hi,
Looking for someone who might have routes (lit or dark) from Detroit, MI to
Columbus, OH preferably using a straight’ish shot from Toledo to Columbus.
Most routes I’ve seen from the larger providers tend to run Toledo - Lima -
Columbus or Toledo - Cleveland - Columbus, so I’m hoping a
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