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425 posts

Ultimate Geek

# 201924 10-Sep-2016 07:56
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I'm having some weird issues with my fibre service with the pattern below:

Sunday both internet and phone service stopped working sometime during the afternoon. Note that phone is connected directly to the ONT. In addition I tried a different working phone and a different router and Ethernet cable. This initially showed up as a red error LED on the optical indicator but seemed to change (see below). Both Sunday and Monday were fairly wet and miserable days here.
Tuesday working sometime 1300-1430. Stopped sometime between 2300 – 2350. Tuesday was sunny with little rain.
Wednesday working about 1215. Wednesday had a bit of rain but was also fairly sunny.
Thursday stopped about 0147. Thursday was another very wet day.
Friday working about 1349. Stopped at 2144. Friday was another fairly sunny day.

I've finally gotten through to MyRepublic who have notified Chorus. Presuming it continues a similar pattern and Chorus pay attention, they just have to make sure they come in the morning. I'm assuming they also have access to more stats like attenuation and optical error rates that I don't have access to. (Maybe MyRepublic do but they haven't said anything.) Just in case and also since I don't know that much about fibre I'm wondering out of personal interest if my guess could be right. (I'm not sure if the details will be revealed even after it's fixed.)

I'm thinking a temperature and/or moisture related issue. Maybe water has somehow gotten somewhere it shouldn't (I guess one of the connections/splice points) and is condensing during cold weather and attenuating the signal enough to make problems? Alternatively a classic expansion/contraction problem.

The MyRepublic rep doesn't seem to think it's weather related (I appreciate it's Chorus reps that should know) but the pattern looks a lot like it to me. I know fibre optics are fairly different from metal cables, e.g. their expansion under temperature is a lot less. But I've found suggestion these sort of problems can still arise if there's an improper installation or defective cable.

Could be electronic equipment. I don't think it's the ONT since I've tried heating the area around the ONT on Thursday when it was not working and this didn't help. So Chorus's equipment further afield, but I would have thought this would affect someone else as I know there are at least 3 people with fibre near me (albeit haven't asked if they were having problems).

Another interesting point is the ONT itself seems to have 3 failure modes.

1 optical light shows red, LAN1 port is normal (orange for GbE provided the router is connected). Think this happens after been in state 2 or 3 for while, but it's also changed to 2 or 3 after being in 1.
2 optical is green light, but no light on the LAN1 port. Router also doesn’t detect connection on the WAN port. Tried restarting the router, connecting to a different router or even replacing the Ethernet cable but LAN1 port never lights up except briefly during startup of the ONT.
3 all lights on the ONT indicate a normal connection (optical green & LAN1 port light orange). Router does detect connection on the WAN port but doesn't receive an IP. (Restarts, diff router etc don't help.)

P.S. Initially I did try restarting the ONT, even leaving it off for hours. I've stopped that as it doesn't seem to help and the service comes back without that.


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263 posts

Ultimate Geek

  # 1627051 10-Sep-2016 16:52
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Optic red light means no connection back to the OLT in the Exchange/Cabinet.


Chorus and other LCFs can tell when this is down and how long it has been down for. 


They will normally ask you to restart the ONT, if that does not fix it they will normally send a tech out.


Fibre is generally not impacted by weather/water like copper is.


The 2 main reasons I have found for the optic light to go red is either someone cuts the cable or a tech disconnects it (normally by accident by knocking something or because they think it is unused)

263 posts

Ultimate Geek

  # 1627053 10-Sep-2016 16:54
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It maybe a fault ONT as well, I had one of these go faulty in Tauranga within a week of install. UFF came out and swapped and it has been good since then.


2045 posts

Uber Geek


  # 1630488 14-Sep-2016 20:16
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I've had an intermittent optical outage (red optical LED) and it turned out to be a break in my fibre lead at the cabinet.


My connection is four years old so the tray it uses has been opened and shut many times resulting in the fracture. Some light got through hence the erratic result. The tech saw it immediately with the dB meter.

521 posts

Ultimate Geek

Lifetime subscriber

  # 1630519 14-Sep-2016 20:59
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We had a similar issue last weekend. Our connection died on Friday evening, and the optical light on the ONT had gone red. I had also put it down to weather, because of the storm last week (our aerial lead had been swinging all over the show).


But, on Saturday when the Chorus tech came out to take a look, I drove past and saw him down the street working in the "pit" where the fibre cables are joined. Shortly afterwards the connection was up again. 


Vodafone didn't confirm what the issue was, but it sounds like it was something similar to the above. Our connection was only installed a few months ago.



425 posts

Ultimate Geek

  # 1655973 21-Oct-2016 21:04
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Forgot to update this. I actually got a call about an hour or so after writing the above from Chorus technician saying he would be coming to fix and when. He was about 25 minutes late so he checked I was still available and apologised for it when he came around. He checked ONT inside house, then moved to termination box outside, then went to where it connects further along street and fixed it after about 15 minutes or so. He said there was a loose connection and so very high attenuation 32 (I guess dB) and so some light got through but not enough for a stable connection. I presume it was indeed made worse by temperature or moisture but didn't but to ask that part. I'm not sure if he was aware it worked fine for quite a few hours on several days only to die again at night. (Loose connection is the sort of thing I was expecting which would be affected by temperature or moisture despite being fibre.)


I have to say I was impressed with professionalism of technician and speed of response from Chorus, unlike what I experienced during installation (from Chorus), and what I experience from MyRepublic before I got the fault logged.

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