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The Asymmetric Digital Subscriber Line is your existing telephone line. Asymmetric means that the data transfer speed is not the same in both directions. Typically the downstream is at least four times the upstream speed.
Bell Sympatico currently offers ADSL.
The maximum theoretical throughput of ADSL is 8mbps down, 1mbps up.
ADSL is a distance-sensitive technology: As the connection's length increases, the signal quality decreases and the connection speed goes down. The limit for ADSL service is 18,000 feet.
1Mbit - 4.8KM
3Mbit - 3KM
Your ISP may also turn on interleaving for error correction depending on your lines condition.