Tuesday, March 24th, 2020 (7:44 am) - Score 10,160

Yesterday was an important day for broadband ISPs in the United Kingdom because it was the first working Monday after the mass closure of schools, which has concentrated the demands of both home (remote) working and family internet traffic on to residential connectivity. But as expected the day was busy, albeit uneventful.

Over the past few weeks we’ve all heard the often scaremongering TV and newspaper reports, which have claimed that broadband in the UK would be “unable to cope” with the change in internet traffic as more people suddenly find themselves stuck at home. We’ve already explained – repeatedly – why such an interpretation, which fails to understand both the nature of the traffic change itself and how ISPs actually manage it, is so misleading (here).

Since then a number of major video streaming providers (e.g. Netflix, YouTube, Apple TV, Amazon and Disney+) have implemented measures to reduce the video quality of their streams. But in reality the impact on data traffic from this adjustment is likely to be limited because most ISPs already cache popular video content closer to their end-users (CDN – Content Delivery Network), which saves their external links from being put under real strain.

Nevertheless we decided to keep a close eye on traffic passing over the London Internet Exchange (LINX) yesterday. We were expecting the combined impact of home working and school closures to push the level of daytime internet traffic a bit above last Monday, albeit not excessively so since the weather was fairly stable (i.e. children could enjoy the garden a bit more, where available).

As expected the 23rd March saw a modest increase in usage over Monday last week. For example, LINX’s primary LON1 switches recorded a peak of 3.86Tbps (Terabits per second) at 6pm on 16th March, which compares with 4.17Tbps at 5pm on 23rd March. Noticeable but we have seen a similar peak last Tuesday.

NOTE: LINX does NOT provide a complete overview of internet traffic flow from all of the ISPs (e.g. LINX does NOT provide a complete overview of internet traffic flow from all of the ISPs (e.g. BT ’s network alone recently saw a peak of 17.5Tbps) but they do offer a useful indication for how such networks are behaving.

We also asked a few of our readers to conduct some broadband speedtests during the day across the four largest ISPs (BT, TalkTalk, Sky Broadband and Virgin Media) but noticed no real deviation from their normal line performance, although this was far too anecdotal to draw any solid conclusions.

Thankfully it looks like Andrew at Thinkbroadband read my mind and conducted a much wider analysis to look at average broadband ISP speeds (all packages and connection types) – those conducted via TBB’s speed tester – over the past few months. The result helps to reinforce what we’ve been saying for awhile now, which is that fixed broadband ISPs in the UK are perfectly able to adapt.

The next event to watch will be today’s Disney+ launch, although we suspect that the major ISPs will have already worked with them to optimist their CDNs and so, once again, the impact shouldn’t be too big. Likewise we often see that the use of one video streaming service tends to replace, at least in part, the use of another (i.e. people choosing to watch Disney+ when they might normally binge YouTube or Netflix etc.).

At this point it’s worth reminding readers that consumer consumption of data is constantly rising and providers are always upgrading their networks to keep pace, often while planning several years in advance for future demand. For example, the average monthly data volumes per household on fixed broadband connections jumped from 240GB (GigaBytes) in 2018 to 315GB in 2019.

Most networks are built to cope with significant peaks (surges) in usage that can go many times above their normal levels and thus people really need not worrying about broadband ISPs running into too much difficulty. Admittedly some ISPs might have been more lax with their upgrades and localised congestion issues can still occur (usually experience as mildly slower speeds), but that’s true even in normal times.

Broadly speaking what we’re seeing falls into the ‘busy.. but still business as usual’ category. A far bigger threat to ISPs is the impact of COVID-19 on staffing, which has already hit the ability of some providers to handle new sales, provide effective customer support and send out engineers. Delays should be expected and please only contact your provider if it’s truly urgent.

Now it looks like some of the mass media have switched their attention to mobile networks. The FT (paywall) reported yesterday that “a surge of up to 50% in the number of phone calls being made over mobile and landline networks has put Britain’s telephone system under significant strain,” which they said has resulted in issues of call quality, dropped calls and a major outage last week (we think they meant this, which was not attributed by the operators to the impact of the Coronavirus).

Quite why the FT also singled out “landline networks” above we do not know as the way they’re setup should not really cause the same sort of problems as mobile networks may experience. Indeed we’ve yet to see any evidence or mass complaints about such things (i.e. nothing above the normal level of gripes, usually focused on copper line quality etc.).

However, mobile network infrastructure is fundamentally different from fixed lines and we have, in the recent past, seen examples where major unexpected events (e.g. terrorist attacks in a busy city centre) have temporarily overwhelmed localised cells with a massive surge in new requests (calls, data connections, texts etc.).

Realistically it can be difficult to prepare mobile infrastructure for such things at every single location but they do improve with each new generation of technology. On the bright side as more people work from home then the mobile burden should ease as some traffic will switch to WiFi etc.