London Transport (uk.transport.london) Discussion of all forms of transport in London.

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Old August 1st 19, 10:57 AM posted to uk.transport.london
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Default 4G on the tube

In message , at 11:45:24 on Thu, 1 Aug
2019, Someone Somewhere remarked:

The money to put the 4G on the tube is coming from the much-delayed
Emergency Network project. There isn't any money to install 5G, and
it's far too late to start changing the Emergency Network spec to
include 5G.

That's the kind of thing which makes large government IT projects
even later and more over budget than they already are.


And even more out of date.


It's less out of date than Airwave.

Combined base stations and aerial arrays are already available and they
should have been using those even if they aren't turning on the 5G bit
now.


Even with all this talk of Chinese manufacturers being banned?

This is particularly true as 5G is far better at dealing with high
densities of users which a tube station / train is a rather good
example of.


Are you suggesting the same leaky feeder that might be delivering 4G on
the Tube, could one day be re-purposed to also deliver 5G? In which
case, what's wrong with pressing on installing it.
--
Roland Perry

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Old August 1st 19, 09:43 PM posted to uk.transport.london
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Default 4G on the tube

On Thu 01/08/2019 20:22, wrote:
On Thu, 1 Aug 2019 17:55:41 +0100
MissRiaElaine wrote:
On Thu 01/08/2019 07:08, Roland Perry wrote:
In message , at 19:20:32 on Wed, 31 Jul
2019,
remarked:

It's also going to be a total waste of time and money. Tetra just
worked, why change it..?

I think the problem is it's proprietary, and rather old. Replacing worn

Not that old in radio terms. Plod was still using motorola analogue
trunking
systems only 15 years ago - I used to listen to them on a scanner.
Tetra is
a lot newer than DAB!

The equipment's old, not the technology (although most would agree it's
no-longer-fit-for-purpose old.


The push for ever-more-complicated "digital" stuff is to me totally
unnecessary. Call me old school, but I've always believed in the "If it
ain't broke, don't fix it" philosophy. In my last job before I retired
we used Band 3 MPT1327 trunked radios. They performed far better than
any digital systems I've seen.


To be fair, trunking radios are computer controlled by out of band
digital signals, only the actual speech is analogue.


Indeed, although they're not out of band, they're on a (usually)
dedicated control channel. You can hear them very clearly (and
loudly..!) on a scanner.

The audio quality is infinitely better, as it is uncompressed. Ok, so
probably not the best choice for a situation where encryption is
required, but for systems such as a large transport fleet they're ideal.



  #36   Report Post  
Old August 2nd 19, 06:00 PM posted to uk.transport.london
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Default 4G on the tube

On Thu, 1 Aug 2019 22:43:28 +0100
MissRiaElaine wrote:
On Thu 01/08/2019 20:22, wrote:
On Thu, 1 Aug 2019 17:55:41 +0100
MissRiaElaine wrote:
On Thu 01/08/2019 07:08, Roland Perry wrote:
In message , at 19:20:32 on Wed, 31 Jul
2019,
remarked:

It's also going to be a total waste of time and money. Tetra just
worked, why change it..?

I think the problem is it's proprietary, and rather old. Replacing worn

Not that old in radio terms. Plod was still using motorola analogue
trunking
systems only 15 years ago - I used to listen to them on a scanner.
Tetra is
a lot newer than DAB!

The equipment's old, not the technology (although most would agree it's
no-longer-fit-for-purpose old.

The push for ever-more-complicated "digital" stuff is to me totally
unnecessary. Call me old school, but I've always believed in the "If it
ain't broke, don't fix it" philosophy. In my last job before I retired
we used Band 3 MPT1327 trunked radios. They performed far better than
any digital systems I've seen.


To be fair, trunking radios are computer controlled by out of band
digital signals, only the actual speech is analogue.


Indeed, although they're not out of band, they're on a (usually)
dedicated control channel. You can hear them very clearly (and
loudly..!) on a scanner.

The audio quality is infinitely better, as it is uncompressed. Ok, so
probably not the best choice for a situation where encryption is
required, but for systems such as a large transport fleet they're ideal.


True. Other advantages of analogue audio is you can tell when there's
channel clash (though this shouldn't happen with a trunked system),
interference and when the other person is about to go out of range. With a
digital system all you get is silence and feck knows what the problem is.

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