Value Units Service
28.8 kbps Plain Old Telephone System (POTS)
56 kbps Switched 56
56 kbps Switched Multimegabit Data Service (SMDS)
64 kbps Integrated Services Digital Network (ISDN)
64 kbps DS0
128 kbps ISDN Dual Channel
230.4 kbps LocalTalk
640 kbps Asymmetric Digital Subscriber Line (ADSL) Upstream
1 Mbps Cable Modem
1.544 Mbps DS1/T1
2 Mbps IEEE 802.11 wireless (2.4 GHz band)
2 Mbps PCS Wireless
2 Mbps ECP/EPP PC to PC Connection (Parallel Port)
2.048 Mbps E1
3.33 Mbps ATA Hard Drive PIO Mode 0
5.22 Mbps ATA Hard Drive PIO Mode 1
6 Mbps Asymmetric Digital Subscriber Line (ADSL) Downstream
6.312 Mbps DS-2/T2
8.33 Mbps ATA Hard Drive PIO Mode 2
8.448 Mbps E2
10 Mbps 10Base-T Ethernet
11 Mbps IEEE 802.11b wireless (2.4 GHz band)
11.11 Mbps ATA Hard Drive PIO Mode 3
12 Mbps Universal Serial Bus (USB)
16.67 Mbps ATA Hard Drive PIO Mode 4
24 Mbps U-NII Wireless
33 Mbps Ultra DMA Hard Disk 33
34.368 Mbps E3
40 Mbps SCSI-1
40 Mbps IEEE 802.11a wireless (5.6 GHz band)
44.736 Mbps DS3/T3
51.84 Mbps OC-1/STS-1 Synchronous Optical Network (SONET)
64 Mbps 16-bit ISA card (needs 2 clock cycles)
66 Mbps Ultra DMA Hard Disk 66
80 Mbps Fast SCSI
80 Mbps PCMCIA Card (PC Card) 16 bit
100 Mbps 100Base-T Ethernet (Fast Ethernet)
100 Mbps Ultra DMA Hard Disk 100
155.52 Mbps Asynchronous Transfer Mode (ATM)
155.52 Mbps OC-3/STM-1
160 Mbps Fast Wide SCSI
160 Mbps Ultra SCSI
274.176 Mbps DS-4/T4
320 Mbps Wide Ultra SCSI
320 Mbps MicroChannel Card
400 Mbps FireWire (IEEE 1394)
466.56 Mbps OC-9/STM-3
480 Mbps USB 2.0
622.08 Mbps OC-12/STM-4
640 Mbps Wide Ultra2 SCSI
1000 Mbps Gigabit Ethernet
1 Gbps VL Bus
1 Gbps PCI bus at 33 MHz bus speed
1.244 Gbps OC-24/STM-8
1.28 Gbps Ultra160 SCSI
1.28 Gbps Ultra3 SCSI
1.866 Gbps OC-36/STM-12
2 Gbps PCI bus at 66 MHz bus speed
2.1 Gbps AGP 1X port
2.488 Gbps OC-48/STM-16
2.56 Gbps Ultra320 SCSI
3.2 Gbps PCI bus at 100 MHz bus speed
4.2 Gbps PCI bus 64 bit at 66MHz
4.2 Gbps AGP 2X port
4.976 Gbps OC-96/STM-32
8.5 Gbps AGP 4X port
9.953 Gbps OC-192/STM-64
10 Gbps 10G Ethernet (IEEE 802.3ae)
13.271 Gbps OC-255
Legend
kbps kilobits per second. (kilo = thousands)
Mbps Megabits per second. (Mega = millions)
MBps Megabytes per second. (Mega = millions)
Gbps Gigabits per second. (Giga = billions)
   
I make no guarantees this information is correct.  This page exists for my own use and curosity.  I actually didn't even create the majority of information here, it comes from this page; http://www.hawaii.edu/infotech/speeds.html

http://www.buzzsurf.com