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Date: Mon, 05 Jun 2006 17:32:37 +0100
From: Stewart Bryant <stewart@g3ysx.org.uk>
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Subject: Re: LF: Rb standard
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Andre Kesteloot wrote:

> Stewart Bryant wrote:
>
>> Walter Blanchard wrote:
>>
>>> A number of TAIT T801 frequency standards have just appeared on the 
>>> UK surplus market.
>>> They're ex-cellphone bases and I understand have been ditched in 
>>> favour of GPS-locked standards.
>>
>> It's more likely that they are now getting their clock from the PSTN 
>> network.
>>
>> Stewart G3YSX
>>
> but don't they rely on GPS for geographical location of mobile 
> callers? In that case, would they use two separate time references ?

Andre,

They do not provide the US style exact location service over here.

The only requirement on the EU systems is frequency. All of the 
providers that I have spoken
to get this for free from the PSTN. When the network moves to VoIP via 
metro Ethernet
that, as you can imagine, gives rise to a problem. GPS is unlikely to be 
the solution for
many technical, economic and political reasons.

Now it's possible that they are doing timing measurement, or some 
retiming because
of a network jitter problem.

It's also possible (and more likely) that these Rb systems are a relic 
of their analogue
network (which did use free running oscillators) and which is being  
cleared out
of the base stations to make room for next generation equipment. If that 
is the case,
then there will be a lot of them, but they will all be quite old.

- Stewart G3YSX


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<br>
Andre Kesteloot wrote:<br>
<blockquote cite="mid44842AF4.2090802@verizon.net" type="cite">
  <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
  <title></title>
Stewart Bryant wrote:<br>
  <blockquote cite="mid44832B6D.3000805@g3ysx.org.uk" type="cite">
    <meta content="text/html;charset=ISO-8859-1"
 http-equiv="Content-Type">
    <title></title>
Walter Blanchard wrote:<br>
    <blockquote cite="mid003e01c678db$dc5cad70$0200a8c0@AUG2004"
 type="cite">
      <meta http-equiv="Content-Type" content="text/html; ">
      <meta content="MSHTML 6.00.2900.2838" name="GENERATOR">
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      <div><font face="Tahoma" size="2">A&nbsp;number of TAIT T801 frequency
standards&nbsp;have just appeared on the UK surplus market.</font></div>
      <div><font face="Tahoma" size="2">They're ex-cellphone bases and
I
understand have been ditched in favour of GPS-locked standards.<br>
      </font></div>
    </blockquote>
It's more likely that they are now getting their clock from the PSTN
network.<br>
    <br>
Stewart G3YSX<br>
    <blockquote cite="mid003e01c678db$dc5cad70$0200a8c0@AUG2004"
 type="cite"> </blockquote>
  </blockquote>
but don't they rely on GPS for geographical location of mobile callers?
In that case, would they use two separate time references ?<br>
</blockquote>
Andre,<br>
<br>
They do not provide the US style exact location service over here.<br>
<br>
The only requirement on the EU systems is frequency. All of the
providers that I have spoken<br>
to get this for free from the PSTN. When the network moves to VoIP via
metro Ethernet<br>
that, as you can imagine, gives rise to a problem. GPS is unlikely to
be the solution for <br>
many technical, economic and political reasons.<br>
<br>
Now it's possible that they are doing timing measurement, or some
retiming because<br>
of a network jitter problem.<br>
<br>
It's also possible (and more likely) that these Rb systems are a relic
of their analogue <br>
network (which did use free running oscillators) and which is being&nbsp;
cleared out <br>
of the base stations to make room for next generation equipment. If
that is the case, <br>
then there will be a lot of them, but they will all be quite old. <br>
<br>
- Stewart G3YSX<br>
<br>
<br>
<br>
<br>
</body>
</html>

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