[TCUG] Re: Use of fibre-optic, IP addressable UTC

  • From: "Welsh, Paul" <Paul.Welsh@xxxxxxxxxx>
  • To: <tcug@xxxxxxxxxxxxx>
  • Date: Tue, 8 Jul 2008 08:20:07 +0100

Just as background for those who are not so ancient, the comm's loss
isolate was built in in the days when it was hard to keep 300 Baud lines
up and reasonably reliable. =20
BT used average signal strength meters to claim the lines were working
(moving coil galvo's no less), failing to understand that we had gone
digital - just. =20

Because of the way intermittent drop out's can cause odd effects on the
road so to speak, it is still relevant.

PW

=20


-----Original Message-----
From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx] On
Behalf Of Douglas Cook
Sent: 07 July 2008 15:05
To: 'tcug@xxxxxxxxxxxxx'
Subject: [TCUG] Re: Use of fibre-optic, IP addressable UTC

The loss of comms for a "few seconds" causes the UTC system to isolate
and
drop back into local control.
This is the problem we have with our comms system. The blue in station
has a
protocol where any loss of comms for 3 consecutive seconds causes it to
isolate that site.=20

The problem is it seems the wireless comms system we have purchased
cannot
achieve reliable comms with out these three second drops. Some of our
sites
currently isolate 10 times during the morning peak which is pretty un
workable.  I have been told by our comms supplier that the threes
seconds
drop out are a characteristic of wireless comms and must be accepted!

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