Leased line speeds


ISDN       128 Kbps    typical using two 64 kbps B-channels, or 144 kbps when also using the D-channel
IDSL       144 Kbps    35,000 ft from CO, no dialtone
HDSL      1.54 Mbps    requires 2 lines to CO
T-1       1.54 Mbps    24 DS0 lines, $1200 to $200/mo
SDSL       2.3 Mbps    22,000 ft from CO, no dialtone
ADSL         8 Mbps    18,000 ft from CO, 800 Kbps upload
T-3     43.232 Mbps    28 T1s
VDSL        52 Mbps    4,000 ft from CO, 16 Mbps upload
OC-3       155 Mbps    100 T1s
OC-12      622 Mbps    4 OC3s
OC-48      2.5 Gbps    4 OC12s
OC-192     9.6 Gbps    4 OC48s



Also see...
http://en.wikipedia.org/wiki/Digital_Subscriber_Line