06-04-2012 04:35:00 AM - edited 06-04-2012 04:35:24 AM
I recently got internet only Max Uverse for my internet in my apartment. I've noticed slower speeds esp with uploading compared to what I believe I should be paying for.
I was wondering if people could help me interpret the bitloading graph.
I understand the profile section is red because UV realtime doesn't understand that I have internet only, but help with bandwidth and bitloading would be great!
Thanks so much!
06-04-2012 09:06:46 AM - edited 06-04-2012 09:08:52 AM
It looks like there may be a bridge tap on your line. A bridge tap is an extra length of wire attached to your pair that doesn't terminate anywhere. It is usually left over from a previous customer that used your pair. Bridge taps cause problems with xDSL services.
A bridge tap causes an artifact in the bitloading graph known as a "null". It's a point in the graph where the frequencies can't be used. You actually have two nulls in your graph, one at 2.0 MHz, and another at 4.6 MHz. The 4.6 MHz null is the source of your problems, it is right in the middle of the upload band.
You should call technical support, have them send a premises tech to your house to check the line. He should open a helper ticket with the Installation and Maintenance group (I&M), which are the linesmen, to come find and remove the bridge tap.
06-08-2012 10:57:30 PM
The other place that the bridge tap may be is in the apartment itself. Generally on an internet only install, it's tested for a bridge tap outside at the NID or MPOE (last accessible location for service outside). Unless the tap is outside it would be billable to cut the bridge tap inside the apartment because since it was a self install, this is considered billable work. Usually the tap inside the house is due to the nature of the daisy chain through the apartment. The only other way to avoid this would be to find the last jack in line and plug the modem in there. This will only work though if the line runs through the apartment and does not have different branches.
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