In article , Steve Terry
scribeth thus
"Rupert Moss-Eccardt" wrote in message
...
Steve Terry wrote:
"Rupert wrote in message
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Steve Terry wrote:
"tony wrote in message
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In , Steve Terry
scribeth thus
"Roy wrote in message
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On 22 Sep, 11:55, wrote:
"Roy wrote in message



On 22/09/10 11:24, Recliner wrote:
snip

Well done. How about the actual operational needs.
To pick a simple example. Tetra works on the TGV, GSM doesn't


GSM could, GSM is now possible on airliners using cells on the aircraft
linked up to satellite or down to ground stations, and GSM is regularly
used on sea going Ferries using similar systems.

A more practical example is when i was in Hong Kong in 2002 i was using
GSM all over their MTR underground railway.
Obviously if the public have GSM down there, so did the staff and any
emergency services.

Tetra is a badly conceived and applied standard that should never have
existed and only does because of the vast amounts of money and
bureaucracy dedicated to it.

But quite why?..

Dolphin has proved it to be a commercial failure.

Dolphin was never planned properly, never worked as it should have done,
and no one understood it and what it could and couldn't do;!;..

Steve Terry

--
Tony Sayer

"tony sayer" wrote in message
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In article , Steve Terry
scribeth thus
"Rupert Moss-Eccardt" wrote in message
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Steve Terry wrote:
"Rupert wrote in message
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Steve Terry wrote:
"tony wrote in message
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In , Steve Terry
scribeth thus
"Roy wrote in message
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On 22 Sep, 11:55, wrote:
"Roy wrote in message



On 22/09/10 11:24, Recliner wrote:
snip

Tetra is a badly conceived and applied standard that should never have
existed and only does because of the vast amounts of money and
bureaucracy dedicated to it.

But quite why?..


Clearly Politics, the Home Office wanted a system that was entirely
independent of publicly available networks.
No matter how badly conceived or developed, with no limit on cost.
With whatever the disadvantage to the public, or even creating unknown
health issues.
(What **** thought it a good idea to multiplex Tetra at only 17.6Hz?!
a frequency known to cause visual epilepsy )

Not having a entirely independent system not being something that
worried the Scandinavians meant they got a very practical digital system,
(900MHz GSM Pro) years earlier for about one hundredth the price of Tetra.

GSM Pro of course offers closed secure PTT groups and normal
international phone calls, to all emergency services and commercial users.

In the USA PTT over cellular is fast becoming popular for closed
commercial and emergency services groups.
http://en.wikipedia.org/wiki/Push_to_talk
(Maybe cos Tetra with its vested interests doesn't exist there?)

Only Orange offered a hardly advertised PTT over GSM here,
and that was only to business users, such limited offering was
destined to fail.

Why almost non existent offerings from the UK GSM networks?
IMHO it must have been Gov pressure not to affect Tetra
and Dolphin sales and the vast army of bureaucrats it supports

Steve Terry
--
"I would like to plead for my right to investigate natural phenomena
without having guns pointed at me.
I also ask for the right to be wrong without being hanged for it."
- Wilhelm Reich, November 1947

Steve Terry wrote:
"tony wrote in message
...
In , Steve Terry
scribeth thus
"Rupert wrote in message
...
Steve Terry wrote:
"Rupert wrote in message
...
Steve Terry wrote:
"tony wrote in message
...
In , Steve Terry
scribeth thus
"Roy wrote in message
...
On 22 Sep, 11:55, wrote:
"Roy wrote in message



On 22/09/10 11:24, Recliner wrote:
snip

Tetra is a badly conceived and applied standard that should never have
existed and only does because of the vast amounts of money and
bureaucracy dedicated to it.

But quite why?..


Clearly Politics, the Home Office wanted a system that was entirely
independent of publicly available networks.
No matter how badly conceived or developed, with no limit on cost.
With whatever the disadvantage to the public, or even creating unknown
health issues.
(What **** thought it a good idea to multiplex Tetra at only 17.6Hz?!
a frequency known to cause visual epilepsy )

Your first incorrect assumption was that the Home Office had any real
input into Tetra. Wrong department. Try again.

Not having a entirely independent system not being something that
worried the Scandinavians meant they got a very practical digital system,
(900MHz GSM Pro) years earlier for about one hundredth the price of Tetra.

When do you think GSM Pro became a "standard". When do you think Tetra did?

GSM Pro of course offers closed secure PTT groups and normal
international phone calls, to all emergency services and commercial users.

In the USA PTT over cellular is fast becoming popular for closed
commercial and emergency services groups.
http://en.wikipedia.org/wiki/Push_to_talk
(Maybe cos Tetra with its vested interests doesn't exist there?)

There are still issues. Perhaps you should read stuff around the DHS
problems with there not being a single standard for all agencies.

Only Orange offered a hardly advertised PTT over GSM here,
and that was only to business users, such limited offering was
destined to fail.

Why almost non existent offerings from the UK GSM networks?
IMHO it must have been Gov pressure not to affect Tetra
and Dolphin sales and the vast army of bureaucrats it supports


The PTT over GSM has well-known shortcomings. Call setup time is too
long, talk groups are too small. But please don't let facts get in the
way of a good rant.

Rather than parading your ignorance repeatedly, why not look some stuff
up and make a reasoned argument?

Tetra is a badly conceived and applied standard that should never have
existed and only does because of the vast amounts of money and
bureaucracy dedicated to it.

But quite why?..


Clearly Politics, the Home Office wanted a system that was entirely
independent of publicly available networks.

Thats not a bad reason at all. I've seen the public mobile nets jam up
rather badly over the years and fail 'tho not that often..

No matter how badly conceived or developed, with no limit on cost.
With whatever the disadvantage to the public, or even creating unknown
health issues.
(What **** thought it a good idea to multiplex Tetra at only 17.6Hz?!
a frequency known to cause visual epilepsy )

Yes, and has it or does it?..


Not having a entirely independent system not being something that
worried the Scandinavians meant they got a very practical digital system,
(900MHz GSM Pro) years earlier for about one hundredth the price of Tetra.

GSM Pro of course offers closed secure PTT groups and normal
international phone calls, to all emergency services and commercial users.

In the USA PTT over cellular is fast becoming popular for closed
commercial and emergency services groups.
http://en.wikipedia.org/wiki/Push_to_talk
(Maybe cos Tetra with its vested interests doesn't exist there?)


It doesn't seem to be used much or at all in the UK. I believe that its
problematical..

Only Orange offered a hardly advertised PTT over GSM here,
and that was only to business users, such limited offering was
destined to fail.

Why almost non existent offerings from the UK GSM networks?
IMHO it must have been Gov pressure not to affect Tetra
and Dolphin sales and the vast army of bureaucrats it supports


Are there really a vast number that supports it?, last I heard there
weren't that many working on it anyway!..
Steve Terry

--
Tony Sayer