What about Modular DOCSIS 3.0 deployments with external timing sources
between the QAM and CMTS
A CMTS DS payload is formatted as an MPEG TS (it even has PIDs;
however, no PCR). This in turn establishes cadence for associated
downstream devices (eg. they sync to whatever is within allowable
On Jan 21, 2011 6:49 PM, Pete Carah p...@altadena.net wrote:
On 01/21/2011 04:29 PM, Lamar Owen wrote:
On Friday, January 21, 2011 04:23:52 pm Michael Holstein wrote:
Aren't CDMA BTS clocked off GPS?
Yep; and many of the aftermarket GPS receivers commonly used for the
disciplined clock for
- Original Message -
From: Gary Buhrmaster gary.buhrmas...@gmail.com
Most of the brand name GPS NTP solutions have a clock
with is more than stable enough to survive without GPS
lock for 45 minutes(*). Some of the more expensive units with
temperature controlled oscillators have
Sex
On Jan 21, 2011 12:32 PM, Robert E. Seastrom r...@seastrom.com wrote:
It is unclear from this NOTAM whether this is an intentional
perturbation of the satellite signals vs. a terrestrial transmitter
(my money is on the latter), but it illustrates why one might want
geographically
On Fri, 21 Jan 2011, Gary E. Miller wrote:
For non pilots, RAIM is an indicator that the GPS has a redundant
solution that matches the barometrically measured altitude.
I know this is off topic, but I don't like to let incorrect information
float around uncorrected.
RAIM never uses any
On 1/21/11 2:26 PM, Robert E. Seastrom wrote:
Michael Holstein michael.holst...@csuohio.edu writes:
I'd be curious to see what effects (if any) those who use
GPS-disciplined NTP references in Southeastern Georgia see from this
experiment.
Aren't CDMA BTS clocked off GPS?
NTP
It is unclear from this NOTAM whether this is an intentional
perturbation of the satellite signals vs. a terrestrial transmitter
(my money is on the latter), but it illustrates why one might want
geographically dispersed time sources on one's network, as well as why
the current trend towards
As I understand it, they're trying to get the WAAS sat back online and
working properly after it went on walkabout some time ago. It's currently in
a nonstandard orbit while they work on it. I suppose it's just pure
speculation that they'd only be working on the WAAS service since the NOTAM
On Fri, Jan 21, 2011 at 12:35:32PM -0500, Jack Carrozzo wrote:
As I understand it, they're trying to get the WAAS sat back online and
working properly after it went on walkabout some time ago. It's currently in
a nonstandard orbit while they work on it. I suppose it's just pure
speculation
On 1/21/2011 9:31 AM, Robert E. Seastrom wrote:
It is unclear from this NOTAM whether this is an intentional
perturbation of the satellite signals vs. a terrestrial transmitter
(my money is on the latter)
I'm not sure how you'd get increasing radius with altitude from anything
but a jammer
On Fri, Jan 21, 2011 at 12:36 PM, Majdi S. Abbas m...@latt.net wrote:
Nahh, that was the western WAAS sat, IIRC.
This is...Something Else Entirely.
Ahh, my mistake.
Sitting in the back now,
-Jack Carrozzo
-
From: Jack Carrozzo [mailto:j...@crepinc.com]
Sent: Friday, January 21, 2011 10:40 AM
To: Majdi S. Abbas
Cc: Robert E. Seastrom; nanog@nanog.org
Subject: Re: anyone running GPS clocks in Southeastern Georgia?
On Fri, Jan 21, 2011 at 12:36 PM, Majdi S. Abbas m...@latt.net wrote:
Nahh
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Yo All!
On Fri, 21 Jan 2011, Matthew Kaufman wrote:
I'm not sure how you'd get increasing radius with altitude from anything but a
jammer near sea level.
Agreed.
One of these tests was recently run in Utah and we saw the effects
in Central
On Jan 21, 2011, at 10:27 AM, Gary E. Miller wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Yo All!
On Fri, 21 Jan 2011, Matthew Kaufman wrote:
I'm not sure how you'd get increasing radius with altitude from anything but
a
jammer near sea level.
Agreed.
One of these
Matlock, Kenneth L matlo...@exempla.org writes:
Probably related to:
http://www.engadget.com/2011/01/20/faa-warns-of-ongoing-gps-issues-in-so
utheastern-us-due-to-defens/
Sounds like they're doing 'tests' on GPS near SE Georgia.
Yes, very likely related considering that the map from the
I'd be curious to see what effects (if any) those who use
GPS-disciplined NTP references in Southeastern Georgia see from this
experiment.
Aren't CDMA BTS clocked off GPS?
NTP isn't going to be the only ripple.
Regards,
Michael Holstein
Cleveland State University
NTP isn't going to be the only ripple.
Most of the brand name GPS NTP solutions have a clock
with is more than stable enough to survive without GPS
lock for 45 minutes(*). Some of the more expensive units with
temperature controlled oscillators have hold times in the
many weeks. My guess is
On Jan 21, 2011, at 4:23 PM, Michael Holstein wrote:
I'd be curious to see what effects (if any) those who use
GPS-disciplined NTP references in Southeastern Georgia see from this
experiment.
Aren't CDMA BTS clocked off GPS?
NTP isn't going to be the only ripple.
Regards,
On Jan 21, 2011, at 4:45 PM, Gary Buhrmaster wrote:
NTP isn't going to be the only ripple.
Most of the brand name GPS NTP solutions have a clock
with is more than stable enough to survive without GPS
lock for 45 minutes(*). Some of the more expensive units with
temperature controlled
Michael Holstein michael.holst...@csuohio.edu writes:
I'd be curious to see what effects (if any) those who use
GPS-disciplined NTP references in Southeastern Georgia see from this
experiment.
Aren't CDMA BTS clocked off GPS?
NTP isn't going to be the only ripple.
Sure, and there are
Gary Buhrmaster gary.buhrmas...@gmail.com writes:
NTP isn't going to be the only ripple.
Most of the brand name GPS NTP solutions have a clock
with is more than stable enough to survive without GPS
lock for 45 minutes(*). Some of the more expensive units with
temperature controlled
On Fri, Jan 21, 2011 at 5:26 PM, Robert E. Seastrom r...@seastrom.com wrote:
Sure, and there are GPS-steered Rb clocks in telco-land too as well as
a ton of stuff I don't know about yet until everyone else here chimes
in; it's just that NTP is highly visible to NANOGers.
What about Modular
On 1/21/11 2:26 PM, Robert E. Seastrom wrote:
Michael Holstein michael.holst...@csuohio.edu writes:
I'd be curious to see what effects (if any) those who use
GPS-disciplined NTP references in Southeastern Georgia see from this
experiment.
Aren't CDMA BTS clocked off GPS?
NTP isn't
On Jan 21, 2011, at 1:45 PM, Gary Buhrmaster wrote:
NTP isn't going to be the only ripple.
Most of the brand name GPS NTP solutions have a clock
with is more than stable enough to survive without GPS
lock for 45 minutes(*). Some of the more expensive units with
temperature controlled
Joel Jaeggli joe...@bogus.com writes:
Sure, and there are GPS-steered Rb clocks in telco-land too as well as
a ton of stuff I don't know about yet until everyone else here chimes
in; it's just that NTP is highly visible to NANOGers.
if your high quality stratum one time source isn't capable
On Friday, January 21, 2011 04:23:52 pm Michael Holstein wrote:
Aren't CDMA BTS clocked off GPS?
Yep; and many of the aftermarket GPS receivers commonly used for the
disciplined clock for NTP originally came from that service (Agilent/HP Z3801
and Z3816, for instance).
On 01/21/2011 04:29 PM, Lamar Owen wrote:
On Friday, January 21, 2011 04:23:52 pm Michael Holstein wrote:
Aren't CDMA BTS clocked off GPS?
Yep; and many of the aftermarket GPS receivers commonly used for the
disciplined clock for NTP originally came from that service (Agilent/HP Z3801
and
On Fri, 21 Jan 2011, Robert E. Seastrom wrote:
Firstly (idle curiosity) - does anyone have further publicly
divulgable details on what's apparently a terrestrial jammer test or
maybe an operational exercise involving the Bermuda Triangle and
making planes and ships disappear...
My first
28 matches
Mail list logo
