BBC Mux dead in South West Region

The poor buggers in Plymouth have lost everything (including IT and
probably
inter-regional phones), presumably as it's all part of the Managed
Broadcast
Network.

Good to see they have all their eggs in one basket. No doubt the main and
reserve still have
numerous single points of failure.

DMac / Paul Radcliffe wrote:
.....lost everything (including IT and probably inter-regional phones),....
No doubt the main and reserve still have numerous single points of failure....

Presumably the ATM service is resilient around the core, but a little
less so toward he edges. Plymouth, I guess is an edge.

What exactly was lost though? Presumably BBC1 and BBC2 analogue
sustained themselves by RBS off Mendip, a previous poster suggested
this wasn't very good, so a D-SAT feed was used instead. Possibly
BBC1 South-West D-SAT stayed up due to equipment at TC understanding
that the back-haul was down? What happened to DTT though, I'd guess
that no mux incoming means that there's no transport stream to
drop-and-insert into, thus no possibility of taking and analogue output
from a D-SAT receiver, and re-coding it into the DTT, at least for
BBC1?



Rgds/

TedJrr wrote:
DMac / Paul Radcliffe wrote:
.....lost everything (including IT and probably inter-regional phones),....
No doubt the main and reserve still have numerous single points of failure....

Presumably the ATM service is resilient around the core, but a little
less so toward he edges. Plymouth, I guess is an edge.

What exactly was lost though? Presumably BBC1 and BBC2 analogue
sustained themselves by RBS off Mendip, a previous poster suggested
this wasn't very good, so a D-SAT feed was used instead. Possibly
BBC1 South-West D-SAT stayed up due to equipment at TC understanding
that the back-haul was down? What happened to DTT though, I'd guess
that no mux incoming means that there's no transport stream to
drop-and-insert into, thus no possibility of taking and analogue output
from a D-SAT receiver, and re-coding it into the DTT, at least for
BBC1?

What you describe, is, what I gather from various forum and Usenet
postings, what occurred.

In view of the DTT failure, I wonder how feasible it would be for the
local code/mux kit to generate a 'dummy' TS, so that at least the local
BBC 1 stream could be 'dropped in' ?

Mark Carver wrote:
TedJrr wrote:
DMac / Paul Radcliffe wrote:
.....lost everything (including IT and probably inter-regional phones),....
No doubt the main and reserve still have numerous single points of failure....
Presumably the ATM service is resilient around the core, but a little
less so toward he edges. Plymouth, I guess is an edge.

What exactly was lost though? Presumably BBC1 and BBC2 analogue
sustained themselves by RBS off Mendip, a previous poster suggested
this wasn't very good, so a D-SAT feed was used instead. Possibly
BBC1 South-West D-SAT stayed up due to equipment at TC understanding
that the back-haul was down? What happened to DTT though, I'd guess
that no mux incoming means that there's no transport stream to
drop-and-insert into, thus no possibility of taking and analogue output
from a D-SAT receiver, and re-coding it into the DTT, at least for
BBC1?

What you describe, is, what I gather from various forum and Usenet
postings, what occurred.

In view of the DTT failure, I wonder how feasible it would be for the
local code/mux kit to generate a 'dummy' TS, so that at least the local
BBC 1 stream could be 'dropped in' ?

Many years ago it was quite common for faults at local studios to loose
or badly corrupt all output the the TX's. Like now, studio "engineers"
were few and far between, were not on call and were reluctant to turn
out in the early hours.
At that time the "Post Office" was quite amenable to a request to bypass
the studio centre. The studios really used to hate that.....

Perhaps BT would.....? No surely not nowerdays...??

FDJ

Mark Carver wrote:
TedJrr wrote:
DMac / Paul Radcliffe wrote:
.....lost everything (including IT and probably inter-regional phones),....
No doubt the main and reserve still have numerous single points of failure....
Presumably the ATM service is resilient around the core, but a little
less so toward he edges. Plymouth, I guess is an edge.

What exactly was lost though? Presumably BBC1 and BBC2 analogue
sustained themselves by RBS off Mendip, a previous poster suggested
this wasn't very good, so a D-SAT feed was used instead. Possibly
BBC1 South-West D-SAT stayed up due to equipment at TC understanding
that the back-haul was down? What happened to DTT though, I'd guess
that no mux incoming means that there's no transport stream to
drop-and-insert into, thus no possibility of taking and analogue output
from a D-SAT receiver, and re-coding it into the DTT, at least for
BBC1?

What you describe, is, what I gather from various forum and Usenet
postings, what occurred.

In view of the DTT failure, I wonder how feasible it would be for the
local code/mux kit to generate a 'dummy' TS, so that at least the local
BBC 1 stream could be 'dropped in' ?


AIUI one (of the 2 supplied as normal) path of the Energis ATM was under
repair when the hedge the fibre was laid on got cut. And so, of course,
was the fibre.

Then a PSU on the working path went down, and it's backup was also
faulty. Time was then required to isolate the fault and get spares out.

Something of a very rare event, I think!

A few years ago some work was carried out to try the idea of a DTT "RBS"
by using DSAT components to assemble a mux at the main SIPSI site. It
was feasible, but very expensive to set up at all the main SIPSI
transmitters.

And as it's impossible to squeeze money from the BBC mandarins for
better monitoring, DTT RBS didn't stand a chance.

On Tue, 12 Sep 2006 13:54:15 +0100, Dickie Mint
wrote:

A few years ago some work was carried out to try the idea of a DTT "RBS"
by using DSAT components to assemble a mux at the main SIPSI site. It
was feasible, but very expensive to set up at all the main SIPSI
transmitters.

It should be possible to transmit a complete backup mux on some
far-off satellite somewhere, then just squirt in the required local
SI/PID-type values according to the local transmitter? ISTR that
something similar was done in the days of ONdigital, although of
course their muxes were national.

--

Zero Tolerance wrote:

It should be possible to transmit a complete backup mux on some
far-off satellite somewhere, then just squirt in the required local
SI/PID-type values according to the local transmitter? ISTR that
something similar was done in the days of ONdigital, although of
course their muxes were national.


That is possible, it's how channel 4 is distributed after all, but can
you see the bean counters accepting it? A whole mux worth that can't be
viewed?