They launched in 2008 - but their facilities were spec-ed quite a long time before they launched, and given that they were working to a tight budget I can understand the decision to be SD...
Having an SD island in a sea of HD infrastructure might have made sense on someones's spreadsheet, but a wider view often exposes other costs and considerations, such as extra 'glue' and operational complications
At that point it was an SD island in a sea of non-news radio infrastructure on-sitee though. When BBC Arabic and Persian's TV facilities were built there was no other significant TV infrastructure - either SD or HD - on that site (BBC News - both TV and Radio - was still based at TV Centre and would continue to be for 5 years)
The BBC Arabic and Persian facilities were built in Peel (then Egton) before any serious decisions about the TV kit to be installed in NBH for TV News had been decided or procurement processes started ISTR (to avoid chosing systems earlier than was sensible for BBC TV News who were moving from
TVC far later), so there were no procurement deals for HD gear already in place. (There was a deal for talkback - as the BBC had decided to go for a single platform on the site for TV and Radio by that point)
It was clear that the output platforms for BBC Arabic and Persian were going to be SD for a significant period (BBC Persian was difficult enough to broadcast in SD because of jamming attempts by the Iranian govt) and they launched with a tight (government supervised) budget which at that point had to be demonstrably independent of BBC News (as they were operated by BBC World Service which wasn't licence fee funded at the time). In 2006/7 it was definitely still possible to buy SD gear, and SD gear was cheaper...
At the time Arabic and Persian were commissioned - BBC News at TV Centre was entirely SD and remained so for a number of years - so there was no SD-HD glue needed initially - again keeping initial costs down.
By the time the main HD NBH build had started, a relatively small amount of SD/HD integration glue for Arabic and Persian wasn't going to be particularly show stopping, and would be a tiny part of the NBH build costs (replicating TV Centre functionality - which had to include SD compatible gear for the regions too)...
As for operational complications - any decently integrated, virtualised, routing systems shouldn't introduce much in the way of those. If you route an SD source to an SD OS on BNCS you get it routed clean, if you route an SD source to an HD destination it automatically routes through an assignable or dedicated up converter, and vice versa via a downconverter (it's just like 4:3 and 16:9 sources and destinations used to be handled when you had both aspect ratios knocking around).
SD and HD media on editing and MAM systems co-exist fine, and on-the-fly exports aren't a huge issue either. Design your routing and production systems effectively and you mitigate operational issues.
Last edited by noggin on 8 August 2018 9:52am - 2 times in total