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Home > Quick Reference
Maximum Dedicated Bandwidths*
How fast is fast? This chart puts into perspective line speeds used in Internet backbones, LANs, and WANs.

13.21 Gbps OC-255
10 Gbps OC-192
4.976 Gbps OC-96
2.488 Gbps OC-48, STS-48
1.866 Gbps OC-36
1.244 Gbps OC-24
933.12 Mbps OC-18
622.08 Mbps OC-12, STS-12
466.56 Mbps OC-9
155.52 Mbps OC-3, STS-3
100 Mbps CDDI, FDDI, Fast Ethernet, Category 5 cable
51.84 Mbps OC-1, STS-1
44.736 Mbps T-3, DS-3 North America
34.368 Mbps E-3 Europe
20 Mbps Category 4 cable
16 Mbps Fast Token Ring LANs
10 Mbps Thin Ethernet, category 3 cable, cable modem
8.448 Mbps E-2 Europe
6.312 Mbps T-2, DS-2 North America
6.144 Mbps Standard ADSL downstream
4 Mbps Token Ring LANs
3.152 Mbps DS-1c
2.048 Mbps E-1, DS-1 Europe
1.544 Mbps ADSL, T-1, DS-1 North America
128 Kbps ISDN
64 Kbps DS-0, pulse code modulation
56 Kbps 56flex, U.S. Robotics x2 modems,
33.6 Kbps 56flex, x2 modem communications rate
28.8 Kbps V.34, Rockwell V.Fast Class modems
20 Kbps Level 1 cable, minimum cable data speed
14.4 Kbps V.32bis modem, V.17 fax
9600 bps modem speed circa early 1990s
2400 bps modem speed circa 1980s

Units of Measurement

bit= smallest unit of digital information, i.e. ones & zeros
byte= a set of bits
bps= bits per second
Kbps= kilobits per second =1000 bits per second
Mbps = Million bits per second =1,000,000 bits per second
Gbps = Gigabits per second = 1,000,000,000 (one billion) bits per second
Tbps = Terabits per second = 1,000,000,000,000 (one trillion) bits per second

*Editor's note: individual components in the bandwidth measurement chart have not been separated by Open Systems Interconnect (OSI) protocol layer or media.



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