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[heavyrain]

I know you should never switch a modem off at night if on ADSL/FTTC due to sync reasons but what about if you have FTTP and an ONT? Especially if you have one of those elaborate routers connected to it. A saving of maybe £35 a year between the ONT and router?

[Alex Atkin UK]

It shouldn't cause any problems but its not really recommended.

[bogof]

A significant proportion of the issues with electronic devices are induced from thermal cycling and electrical stresses from start up and shut down of devices; ignoring the complex factors around products that are now basically computers, with file systems etc in flash.  So while it should be OK,  and won't cause your network connection to reduce in speed, as there is no dynamic line management like with analogue lines and VDSL; you will likely be exposing yourself to more chances of a dead box one day when you come to turn it on.  If the inconvenience of having to get them swapped isn't an issue, then go for it.

The ONT has to be replaced by Openreach, I'm not sure what there turnaround is like; while a router could be got off the shelf in a pinch from many retailers.  A halfway house if you were trying to keep your kit working / easily repairable might be to leave the ONT on (which is probably much lower power) and turn off just the router.

[tubaman]

Also some devices, such as Youview boxes, power themselves up in the early hours to check for and download updates so that won't work if you've turned off the ONT and/or router.

[Mark07]

No major issues, as other have said you'd likely miss some firmware updates that are pushed overnight, you might find they're pushed as soon as you power up in the morning causing you downtime (depending on provider)

[dee.jay]

No major issues, as other have said you'd likely miss some firmware updates that are pushed overnight, you might find they're pushed as soon as you power up in the morning causing you downtime (depending on provider)

Can attest, ONT firmware is often pushed out very late at night.

[Alex Atkin UK]

Same issue as game consoles in standby mode or off.  For me, I see it as having them be able to update at any time when I'm not using them ultimately will save more money than them updating while fully powered on, with the TV and surround receiver running.

That said I have a NAS/Server running 24/7 anyway, plus the three network switches, CCTV monitors, LED lights (mum can't see so well so needs ambient light all the time to find the main light switches).  So our background power consumption is not exactly low.

I'd also have to turn off the TV, etc, which are even more prone to the PSUs going bad and can be very expensive to replace.  As mentioned above, the thermal stress wear is a bigger concern IMO as depending on the device it can be a far more expensive replacement than anything you saved in power.