The DSLAM compresses the data so that it can be encoded into the available bandwidth. I don't know any details about the compression, but I know a little about the bandwidth.
DSLAMs where I am are fed with multiple T1s. The DSLAM in my neighborhood serves up to 144 customers with 4 T1s or 6.176Mbps. They can take up to a DS3, or 28 T1s. A single DS3 fed DSLAM can handle up to 5000 lines.
Google leads me to believe each 27 to 36Mbps cable internet channel can serve up to 1000 cable modems.
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Depending on your definition of "good," it can be argued that there hasn't been one in any lifetime.
It sounds like you understand T1 just fine.
The DSLAM compresses the data so that it can be encoded into the available bandwidth. I don't know any details about the compression, but I know a little about the bandwidth.
DSLAMs where I am are fed with multiple T1s. The DSLAM in my neighborhood serves up to 144 customers with 4 T1s or 6.176Mbps. They can take up to a DS3, or 28 T1s. A single DS3 fed DSLAM can handle up to 5000 lines.
Google leads me to believe each 27 to 36Mbps cable internet channel can serve up to 1000 cable modems.