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

(Network speed is mesured in 1000 units, memory and storage space in 1024 units)