My ISP has many SPF (single points of failure
First start with terms FTTC FTTH (FTTP also) Check the wikipedia page.
About 26hrs ago (exactly at 02:01) the following services of my ISP died all together in sync
VOIP (phone voice) XDSL GSM LTE+. I noticed the warning my router gave & the gateway going red and dead. No calls were possible, since the GSM networks also died for me.
How? FTTC we have FTTC small expensive boxes (1.30m 40cm 1.20m) besides the streets. Mine dropped itself hard along with wireless servers in my area. Why? Neglected maintanance. Result catastropic drop of ALL services for 2+hours!
I went into comms survival mode (with my tranceivers) Those were fine of course. Why is there no second route to the servers when my main FTTC box fails? Greed & logistics.
The ISP never told me what happened. A friend inside gave me some data. As a monopolist th ISP has too much technical power over us. There's a FTTH project running, which will at least drop the FTTC network boxes besides the roads. However that project should have been FTTH only. Instead they made a terrible mix of FTTH & FTTC. The mix was made with corruption in the background because the FTTC network is cheaper. Also when they put you on the FTTH network they still deliver absimal XDSL speeds.
The provider has also made a mistake of putting the network FTTH above ground. So every time someone slams the telephone poles down that Network also goes down with all your communications. That means you will have no VoIP no Data, which means a total cut off from what could be a lifeline, when it comes down to the VoIP service, for which the phone providers on my continent still have to give 48 volts of DC power to the phone lines for a whole week after power utility has been cut off. They are forced to do so by Law of the Land.
https://en.wikipedia.org/wiki/Fiber_to_the_x