Full fibre with homehub2

[WSH]

What are the PON and LOS lights on the ONT doing during these hub reboots?

[stevenprigg78]

No idea it’s in my meter cupboard not near the hub so I’ve not checked.

can the ONT cause the hub to reboot?

a brand new hub?

[pddco]

@stevenprigg78 .. That’s fine then.. I’d no idea of the setup, so was just thinking if you had, with having an ONT to power as well, that you may have used a double socket or extension lead that you hadn’t used before. In which case there was a slight possibility that may have been poor connections in the wiring to the socket or internal to the extension lead that may be causing an intermittent power supply issue. Which could trigger the hub restarting. But as it’s been working fine for years, and presumably the ONT is in a socket that’s proven fine, then no problem. Just thought I’d check. 

[iniltous]

You ask can the ONT cause the router to reboot , that’s easy to simulate, while everything is stable and ‘working’ , turn the power off to the ONT and observe the router , does it look sync , feeling more adventurous , unplug the optical cable at the ONT  (the green plug ) and again observe the router …obviously reconnect the power and optical cable after you have finished ‘testing’ .

You seem a little dismissive of the ONT potentially being the issue , but it’s not the ONT ‘per se’ but the lights on the ONT illustrate what’s going on with the PON (the passive optical network) one thing for certain if the PON has problems the router status is irrelevant , the router can’t stay connected if the PON is ‘down’ 

[chrisjp]

"No idea it’s in my meter cupboard not near the hub so I’ve not checked"

So can I suggest that you DO check what the lights on the ONT show when you have an outage or a hub reboot, especially if it's just a matter of opening your meter cupboard door and looking?
That way, the community might be able to offer you better advice.

[stevenprigg78]

I can yes, however if somebody categorically knows whether the fibre modem can cause / prompt a hub reboot it allows me to debug the situation from tge other end

- yes -> could likely be a fibre issue since the whole setup has been done for years before the fibre upgrade

- no -> it’s def a hub issue, somehow 

[stevenprigg78]

It’s not easy to simulate if the ONT can cause the hub to reboot.

why would you think it’s just pulling the Ethernet or pulling the fibre that can do it.

id expect there probably a whole host of ip related commands that can be sent to reboot the HH2

purely the fact that BT can remotely reboot the hub kinda backs up that line of thinking 

in wondering if the fibre is unstable enough that maybe a significant loss of SNR equivalent or bad/lost packets can cause the fibre modem to panic reboot the hub.

i wouldn’t imagine this can be easily checked by just yanking connectors out 

[iniltous]

1…It’s very easy to power off the ONT to imitate the ONT and headend losing sync , you obviously then can go and check the router to see what the hub lights are doing to demonstrate that the PON going down affects the router .
2… I never mentioned pulling the Ethernet as that’s not part of the PON , unplugging the fibre serves the same purpose as powering off the ONT , but more accurately mimics ( for example ) a break in the fibre back to the headend, in both examples the point was to demonstrate that the router will be affected by issues with the passive optical network (PON) which your previous comments seemed to doubt .
3…Yes the hub can be rebooted remotely with the appropriate command from the ISP , but why would anyone from BT be doing that , and there isn’t really any conceivable fault that would consistently replicate that command anyway , if that is that what you think is happening, checking the ONT will prove or disprove that , as any fault indications on the ONT , that’s the LOS light coming on of the PON light flashing would not occur if your router were simply being remotely reset either deliberately or by some weird non PON related issue .
4…This is exactly why you were asked to observe the ONT when problems are happening.
5…See No.1.

[WSH]

@stevenprigg78 

So, what did the Openreach engineer say?

[stevenprigg78]

Connected his meter and said “well it’s working isn’t it”

didn’t seem interested in my neighbour’s trouble either.

just wanted to get back in his van to say he’d attended.

the definition of a “tick box exercise “

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