So I have a customer who has VDSL from Kiwilink. It is just a standard VDSL connection with POTS. Customer is less than 200m from the cabinet and gets very good sync rates (52/10 on 8b) The house was re-cabled (by me) about 2 years ago with Cat 6 - including to the demarc. 2-pair underground lead comes to the ETP and is joined directly to the Cat 6 that goes to the patch panel upstairs. In the panel is a VDSL splitter and a dedicated jack for the modem to be plugged in to. Modem is a Zyxel P870 and is the main router for the network. Nothing special about the network. There is an unmanaged 24-port GigE switch, couple of WAP's and an asterisk server. There are a couple of IP phones and then about 5 computers (laptops and desktops) and a handful of smart phones.

Fault is the connection is dropping every couple of days. They don' get the net back until the modem is reset.

I have replaces the modem once. Changed the splitter for another one. Changed line cords. used different pairs in the cat 6 feeder cable.

Now we have finally got Chorus to come and have a look as it was the only thing not ruled out. I had already used a dynatel on the line though and got what I thought were good results.

So Mr. Chorus (a fault man who I know to be very good at what he does) came and used his dynatel and got very good results on the pair to the cabinet (right up to 90dB of longitudinal balance).

He then suspected the power level was too high as the customer is so close. Rang the data guys and they informed him that DLM is off and settings were being done manually (I knew this as this is what Kiwilink had told us Chorus were doing to monitor it). So the data guys turned DLM back on  hoping it would adjust things to suit the line and are monitoring the line for 7 days as of Friday. Cutomer text me this afternoon saying that it dropped out again today. Oh and they had manually set it to use the 17a profile so gets a sync rate of around 61/11 with around 5dB of attenuation.

I am just totally out of ideas to fix this. It is fairly important his connection stays up as VoIP is his main means of communication. Obviously we have fail over to cell in place but it just shouldn't be an issue.

Can anyone think of anything???!

One last thought I had was bringing the modem out of the panel and terminating the DSL right at the demarc then sending ethernet up to the patch panel. I just don't think it would make that much of a difference considering it is Cat 6 cable.