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Author Topic: 12 days after 80/20 install - help please - possible line fault  (Read 40211 times)

eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #135 on: June 19, 2012, 11:16:49 PM »

After accepting that my router would have to be rebooted every 3 days due to the gradual dropping of SNRM to silly levels without ever recovering, I decided to try one more desperate trick to see if I can stop this issue... I removed the BT Infinity faceplate then removed the box behind it and switched the 2 wires around...

Guess what... I did this yesterday and as I type this my SNRM is at 6.3 - normally it would be around 4.4 or so by now..

From my understanding switching those wires has no bearing whatsoever on anything, but the result is clear here no more dropping SNRM it seems ... I checked the wires before switching them and they were connected properly so can rule out any installation problem. The infinity faceplate is the same as well.

Can anyone explain this at all ?
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asbokid

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #136 on: June 20, 2012, 01:38:59 AM »

Can anyone explain this at all ?

Perhaps explained not by the polarity swap, but by the re-making of the connections?

cheers, a
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Black Sheep

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #137 on: June 20, 2012, 07:33:17 AM »

Concur with Asbo. That's the more likely reason.
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eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #138 on: June 21, 2012, 01:54:30 AM »

SNRM still holding as normal no more drops it seems.
I checked the connection before I remade it andit was as good as can be though.
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burakkucat

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #139 on: June 21, 2012, 02:21:08 AM »

Quote
I checked the connection before I remade it andit was as good as can be though.

A simple query, please -- IDCs or screw terminals?  ???
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eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #140 on: June 21, 2012, 02:32:57 PM »

Screw terminals (I take it they are not good ?)
Would the dropping SNRM suggest that the wire wasnt 100% touching the terminal then ?
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burakkucat

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #141 on: June 21, 2012, 04:32:36 PM »

b*cat nods, not just to the first question but to both of them.

Strange as it may seem, an IDC is a more efficient joint than the classic screw terminal.  :)
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Black Sheep

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #142 on: June 21, 2012, 07:05:30 PM »

b*cat nods, not just to the first question but to both of them.

Strange as it may seem, an IDC is a more efficient joint than the classic screw terminal.  :)

Possibly the first time I may have to disagree with you B*Cat.  :'( ;) ;D

We tend to find more 'HRs' on IDC connections, than anything 'screw fix'. Especially the Krone and BICC strips in the PCP's whereby the 'Jointer' will have formed, split and fed the 100pr cable loosely onto the strips. He will then in rapid succession, work across and down 'podging' (terminating) all the wires on. It only takes the IDC connector tool to be worn, or off-centre to result in a poorly made connection.

The only down side to 'screw fix' IMO, is the elements and onset of verdigris/corrosion. 
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burakkucat

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #143 on: June 21, 2012, 09:29:26 PM »

Possibly the first time I may have to disagree with you B*Cat.  :'( ;) ;D

 :cry2:

Quote
We tend to find more 'HRs' on IDC connections, than anything 'screw fix'. Especially the Krone and BICC strips in the PCP's whereby the 'Jointer' will have formed, split and fed the 100pr cable loosely onto the strips. He will then in rapid succession, work across and down 'podging' (terminating) all the wires on. It only takes the IDC connector tool to be worn, or off-centre to result in a poorly made connection.

Our difference of opinion arises as a result of b*cat accepting the theoretical design principle and B*Sheep having witnessed, first hand, the end result of poor deployment of the method.  :friends:

In theory, a properly made IDC joint is superior. In practice, as we have just been educated, defective usage of the tool can create good looking but poor joints.

Quote

The only down side to 'screw fix' IMO, is the elements and onset of verdigris/corrosion.

The screw head shearing off (unless a torque screwdriver is used), the metallic core being "nicked" when stripping off the insulation, if the wire being terminated is placed under the screw head rather than under a washer the tightening motion can cause microscopic fractures in the wire (all ready to go "ping" and break lose), etc.  :o
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