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Northern Ireland "mini multiplex" (NIMM)

I have added information to the UK Free TV database to cover the so-called mini-multiplex that will carry three Irish channels, TG4, RTE1 and RTE2 in a very special multiplex from three transmitters in Northern Ireland.

I have added information to the UK Free TV database to cover th
published on UK Free TV

A special service for 80%-90% of households in Northern Ireland will see three Freeview additional channels being available. These will be:

Some homes will be able to receive the services directly from the Saorview transmitters in the RoI (see SAORVIEW - Ireland's free digital television service ), and others will, from the digital switchover date of Wednesday 24th October 2012, have a service provided from three Freeview transmitters in Northern Ireland.

Northern Ireland RTE1 RTE2 TG4 minimux transmitters

However, you will not be able to view these services using a standard-definition Freeview receiver - a Freeview HD box or set will be required. It is not known at this time if the NIMM will carry RTE2 in HD, as per the Saorview service. TG4 and RTE1 are broadcast in standard definition at the moment.

The requirement for a Freeview HD receiver is because the services are being broadcasting in "D-Book Option 11", which uses the DVB-T2 standard ("a new mode, option 11, is being planned for a multiplex in Northern Ireland. Receivers should be able to switch between these automatically", D-Book 7, DTG164 is defined in appendix G as: FFT size 32k, 16QAM modulation, 1/128 guard interval, PP7, FEC 64800). Digital Television - Technical guidance on the availability of TG4 in Northern Ireland after digital switchover says that Option 11 is: DVB-T2 16QAM FEC 1/2.

Update: DVB-T2 16QAM FEC 1/2 provides a bitrate for the multiplex of 12.77Mb/s.

Update: DVB-T2, QPSK modulation, FEC 2/3, 32K carriers, 9.954 Mbit/s.

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Friday, 24 February 2012
Peter Henderson

8:08 PM

I very much doubt Saorview from Clermont Cairn will reach Larne Paul, even with the increase in power on October 24th.

If you're getting a patchy signal from Divis at present then things should be much better (if not perfect) after DSO. I'm not sure about the NIMM from Black Mountain. If what Mike is saying is true i.e re. the technical paramaters then you may be OK. I do know that some of the higher parts of Larne enjoy Freeview from Divis even now, so maybe a replacement aerial may help
Failing all that, the situation with Saorsat should become clearer over the next few months so that might be the better option, if you don't want to bother with the subscription service on Sky.

Scottish TV shouldn't be a problem with either the Stranraer or Portpatrick transmitters, although both are Freeview Lite.

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Peter Henderson's 240 posts GB flag
Saturday, 25 February 2012

11:00 AM

From BBC News - New venture brings RTE and TG4 to NI homes :

The Irish Republic's competition authority has permitted the creation of a new digital television multiplex in Northern Ireland.

It will carry services from south of the border.

The joint venture by RTE (Raidio Teilifis Eireann) and Teilifis na Gaeilge (TG4) would bring programmes from both to around 90% of NI homes.

The authority consulted with broadcasting regulators in the UK and Ireland.

It found that the creation of Multiplex Broadcasting Services N.I. Limited would not substantially lessen competition in the market for the sale of television advertising.

Both the UK and Ireland are working towards the switch off of analogue signals at the end of 2012.

The new multiplex will broadcast in DVB-T2, the same parameters used by Freeview HD.

Unlike standard definition Freeview receivers, these devices can be used on both sides of the border.

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Briantist's 38,910 posts GB flag

11:49 AM

My point Peter Henderson is while Welsh people were looking for ways to receive improved receptiono of Irish TV a mentality existed in our small island which sought to deny Irish people of stronger Irish tv signals.

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U's 98 posts IE flag
The Cush
12:46 PM

According to the Competition Authority press release Ofcom has already issued the Broadcast Licence to the RT/TG4 joint venture company -
The Competition Authority: News & Publications » News Releases » Competition Authority clears joint venture between RT and TG4

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The Cush's 5 posts IE flag

1:19 PM

The Cush: Ofcom don't seem to have listed it yet - Ofcom | Multiplex licensees is where it should be.

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Briantist's 38,910 posts GB flag
Peter Henderson

1:38 PM

From the BBC report:

"The new multiplex will broadcast in DVB-T2, the same parameters used by Freeview HD"

but sadly, not in HD, which is a pity.

Still RTE in SD is better than nothing.

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Peter Henderson's 240 posts GB flag
Peter's: mapP's Freeview map terrainP's terrain plot wavesP's frequency data P's Freeview Detailed Coverage
Dave Lindsay

1:57 PM

Perhaps HD will come later.

Sometimes there are licensing issues with programmes broadcast on certain platforms. Could it be that RT will not be able to broadcast certain content (e.g. particular films) north of the border due to licensing issues and that this will mean that if it supplied it in HD, it would have to be a different HD feed to that in Ireland so as to allow opt outs?

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Dave Lindsay's 5,724 posts GB flag

6:32 PM

Dave Lindsay: Quickly looking at the maths from

Bit Rate Calculation for COFDM Modulation

A=54E6 * (packet length/204) = 54E6 * 1
B=A*Bandwidth= 54E6 * 1 = 54E6
C=B*modulation scheme (16QAM=0.5) = 27
D=C*code rate = 216 * .5 = 13.5E6
E=D*guard interval value = 13.5E6 * (128/129) = 13395349

So the bitrate for the multiplex is 12.77Mbps, which probably explains why the services will be SD and you can't really get more than one HD service in 12.77Mbps.

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Briantist's 38,910 posts GB flag
Sunday, 26 February 2012

1:24 PM

the cush: I've shown my working though.

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Briantist's 38,910 posts GB flag
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