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Copper Line Tests: Difference between revisions
→More info on Loop and resistance faults: clean up
(→More info on Loop and resistance faults: clean up) |
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*Available on TT ADSL lines (as Issue TAM Test)
{{CPbox|#Click on the line you want to run the test on
#You
[[File:Coppertest.png|none|frame|Copper test Button on a BT ADSL line]] [[File:TTIssueTAMTest.png|none|frame|TAM Test on a TT ADSL line]]
*With a BT line, simply press the button.▼
*With a TT line, select the test, and the test will be carried out, then after a few minutes go back and select 'Get Last Completed TAM Test Result' to view the results▼
}}
▲With a BT line, simply press the button.
▲With a TT line, select the test, and the test will be carried out, then after a few minutes go back and select 'Get Last Completed TAM Test Result' to view the results
==What does it do?==
Sometimes the line test will (cryptically) suggest that a fault needs to be reported to the phone line provider, e.g., it will say Report to OR (OpenReach), for example:
BT Test CopperLineTest:Fail Line test failed report fault to OR.
fail Line test failed report fault to OR. T023:FAULT - Battery Contact
In this case, report the fault to your phone line provider, if this is BT Retail, then you can report online: https://www.bt.com/faults if the phone line is provided by AAISP then contact Support.
The copper line could come back with other outcomes, such as:
*'''DIS fault''' The test cannot get a capacitance reading of your line. You probably have no dial tone. It's broken somewhere, somehow!
*'''LOOP fault''' The 2 wires that make up the line are in contact with each other and are causing a loop.
*'''Battery Contact fault''' The line is in contact with another line, perhaps due to water, or bad insulation
*'''Earth Contact fault''' The line is going to earth. The line may be damaged and wire touching earth somewhere
*'''Rectified Loop fault''' a one way loop - check internal wiring before going further.
**Some further info here: https://groups.google.com/forum/#!topic/uk.telecom/QdsxWT3QcvQ and see the notes below:
*'''High Resistance DIS fault''' Both lines have high resistance - some connection problem along the line.
If you get a Copper line test error, try the test again with all equipment unplugged, and the NTE5 faceplate removed as the fault could be caused by local wiring or equipment.
==More info on Loop and resistance faults==
Loop fault is a symmetric low DC resistance between A/B wires in the pair. Rectified loop fault is an asymmetric low DC resistance between A/B, as-if there's a diode shorting the fault.
At DC, the line should appear as an open circuit (infinite resistance).
A loop test (among other things) applies a known DC voltage to the line, and measures the current flow - it should see 0 mA current flow with phones all on hook. It then reverses the DC voltage, and expects to see 0 mA again.
If it sees current flow when it applies voltage, you have a loop fault. If the current is different depending on whether A or B is +ve relative to the other, you have a rectified loop fault.
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