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Loop Extender Troubleshooting

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For express power models, do not draw power from a line with dial tone. The loop extender power supply must be fed by no less than 16 AWG wire to work properly.
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Is the power supply grounded? The power supply ground is for dumping surges to ground. Do not attach to frame ground.
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Check the output of the power supply, do you get 116vDC or 155vDC (depending on model)? 116vDC power is for AER800-1p and AER800-2p only; everything else gets 155vDC.
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If you are having trouble, set the DSLAM minimum sync rate to 32kbps and maximum to 24Mbps. Set DSLAM SNR margin (noise margin) to 0 or 1. These settings will help you get a little more distance for testing, but you should return to a normal profile when finished. Sometimes SNR margin and sync rate settings can conspire to prevent synchronization. The bandwidth estimate is based on SNR Margin=6. If your SNR is higher, you will get slower connect speeds. If your SNR is much higher than 10, you may have difficulties in getting connections on long loops. If it is lower than 6, your customer will complain about data errors and resync.
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If you are using the line power extender, check that there are no leakage currents on the line. With no loop extender on the line, current should be essentially zero. With a line powered loop extender, you will read 4-4.2mA. You might read 6-6.2mA if the loop extender has been switched to high power mode.

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