The information from this page comes from many sources. Having worked as a Tier 1 technical support agent for two years under SBC (now AT&T) I learned a lot about the DSL network. Some of this information comes from training. A large amount of this information comes from the excellent help of many techs at Most of these techs are field technicians for SBC, but many work for other companies as well. Some of this information I learned from asking questions, helping out others, and watching the field techs help people out. Below is a list of links showing where much of this information comes from.
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