Ping Rickety C (latency issue)...

[Ivan Vegvary]

You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?
Is it all a fake?
Thought you might know.
Thank you.

 

[Jasen Betts]

On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:

You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.

--
Jasen.

 

[Phil Hobbs]

On 2020-07-30 09:43, Jasen Betts wrote:

On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.

I used to be in the satellite voice business, long ago. There\'s an
easily audible difference in latency between terrestrial, one-hop, and
two-hop paths. Subjectively it\'s roughly an apparent 10 IQ points per
hop.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Jeff Liebermann]

On Thu, 30 Jul 2020 10:27:27 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-30 09:43, Jasen Betts wrote:
On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.


I used to be in the satellite voice business, long ago. There\'s an
easily audible difference in latency between terrestrial, one-hop, and
two-hop paths. Subjectively it\'s roughly an apparent 10 IQ points per
hop.

Cheers

Phil Hobbs

These days, most such links use terrestrial fiber through undersea
cables. Satellites are reserved for communications that does not need
to be real time. The observed delay is transit time transmission
delay, but mostly video and audio compression/decompression delays.
The worst is high quality video, which takes quite a bit of time to do
the compression and decompression. The associated audio has to stay
lip synced to the video, so it is intentionally delayed so that you
don\'t hear the correspondent talking several seconds before you see
his mouth move. Ocassionally, someone forgets this detail, and hear
the voice long before the video. Any loss in IQ during this process
seems to be temporary.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[server]

On Thu, 30 Jul 2020 10:27:27 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-30 09:43, Jasen Betts wrote:
On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.


I used to be in the satellite voice business, long ago. There\'s an
easily audible difference in latency between terrestrial, one-hop, and
two-hop paths. Subjectively it\'s roughly an apparent 10 IQ points per
hop.

Cheers

Phil Hobbs

The usual coast-to-coast phone call seems fine to me.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[Phil Hobbs]

On 2020-07-30 12:46, jlarkin@highlandsniptechnology.com wrote:

On Thu, 30 Jul 2020 10:27:27 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-30 09:43, Jasen Betts wrote:
On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.


I used to be in the satellite voice business, long ago. There\'s an
easily audible difference in latency between terrestrial, one-hop, and
two-hop paths. Subjectively it\'s roughly an apparent 10 IQ points per
hop.

Cheers

Phil Hobbs

The usual coast-to-coast phone call seems fine to me.



It isn\'t satellite anymore AFAICT.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Clifford Heath]

On 31/7/20 12:27 am, Phil Hobbs wrote:

On 2020-07-30 09:43, Jasen Betts wrote:
On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the
world the correspondent stands dumb for 2-3 seconds. After that the
conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.


I used to be in the satellite voice business, long ago.  There\'s an
easily audible difference in latency between terrestrial, one-hop, and
two-hop paths.  Subjectively it\'s roughly an apparent 10 IQ points per
hop.

At one point I had to do some software development using telnet from
Australia to the USA... via two geosynchronous hops. A 2-second echo
sure helps develop accurate typing technique. It\'s amazing how much work
you can get done in 2 seconds without seeing any response on the screen.

I was horrified that the smart developers at Sun seemed to think that
RPC was a sensible paradigm for distributed computing, instead of
asynchronous messaging. Still am horrified really.

Clifford Heath

 

[Robert Baer]

Jeff Liebermann wrote:

On Thu, 30 Jul 2020 10:27:27 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-30 09:43, Jasen Betts wrote:
On 2020-07-30, Ivan Vegvary <ivanvegvary@gmail.com> wrote:
You mentioned latency in another thread.
Question?
On TV news stateside anchor starts with \"Hello Bill\". Across the world the correspondent stands dumb for 2-3 seconds. After that the conversation ensues with no latency.
How is that possible?

Satelites in geosynchronous orbit, it\'s a lot further to any place on
earth by space than it is by fibre.

There used to be geosynchronoius satellites used for phone calls too.


I used to be in the satellite voice business, long ago. There\'s an
easily audible difference in latency between terrestrial, one-hop, and
two-hop paths. Subjectively it\'s roughly an apparent 10 IQ points per
hop.

Cheers

Phil Hobbs

These days, most such links use terrestrial fiber through undersea
cables. Satellites are reserved for communications that does not need
to be real time. The observed delay is transit time transmission
delay, but mostly video and audio compression/decompression delays.
The worst is high quality video, which takes quite a bit of time to do
the compression and decompression. The associated audio has to stay
lip synced to the video, so it is intentionally delayed so that you
don\'t hear the correspondent talking several seconds before you see
his mouth move. Ocassionally, someone forgets this detail, and hear
the voice long before the video. Any loss in IQ during this process
seems to be temporary.

CNN, which is supposed to be professional, has poor IQ delays like
that on occasion.