List of interface bit rates
This is a list of device bandwidths: the channel capacity (or, more informally, bandwidth) of some computer devices employing methods of data transport is listed by bit/s, kilobit/s (kbit/s), megabit/s (Mbit/s), or gigabit/s (Gbit/s) as appropriate and also MB/s or megabytes per second. They are listed in order from lowest bandwidth to highest.
Whether to use bit/s or byte/s (B/s) is a matter of debate. The most commonly cited measurement is bolded. In general, parallel interfaces are quoted in byte/s (B/s), serial in bit/s.
Many of these figures are theoretical maxima, and various real-world considerations will generally keep the actual effective throughput much lower. See Measuring network throughput. The actual throughput achievable on Ethernet networks, for example (especially when heavily loaded), is a subject of hot debate.
Note: All of the bandwidth values listed in this article are true metric quantities, i.e. a kilobit = 1000 bits, NOT 1024 bits; also, a kilobyte = 1000 bytes.[1]
| CONNECTION | BITS | BYTES |
|---|---|---|
| TTY (V.18) | 45 bit/s | 6 cps |
| TTY (V.18) | 50 bit/s | 6.71 cps |
| Note: [2] | ||
| Modem 110 baud | 110 bit/s | 13.75 B/s |
| Modem 300 baud (V.21) | 300 bit/s | 30 B/s |
| Modem Bell 103 (Bell 103) | 300 bit/s | 30 B/s |
| Modem 1200 (V.22) | 1 200 bit/s | 120 B/s |
| Modem Bell 212A (Bell 212A) | 1 200 bit/s | 120 B/s |
| Modem 2400 (V.22bis) | 2 400 bit/s | 240 B/s |
| Modem 9600 (V.32) | 9 600 bit/s | 960 B/s |
| Modem 14.4k (V.32bis) | 14.4 kbit/s | 1.44 kB/s |
| Modem 16.8k (ZyXEL) | 16.8 kbit/s | 1.68 kB/s |
| Modem 19.2k (V.32terbo) | 19.2 kbit/s | 1.92 kB/s |
| Modem 28.8k (V.34) | 28.8 kbit/s | 2.88 kB/s |
| Modem 33.6k (V.34plus/V.34bis) | 33.6 kbit/s | 3.36 kB/s |
| Modem 56k[3] (V.90) (upstream) | 33.6 kbit/s | 3.36 kB/s |
| Modem 56k[3] (V.90) (downstream) | 56 kbit/s | 5.6 kB/s |
| Modem 56k[3] (V.92) (upstream) | 48 kbit/s | 4.8 kB/s |
| Modem 56k[3] (V.92) (downstream) | 56 kbit/s | 5.6 kB/s |
| Note: [4] | ||
| ISDN Basic Rate Interface (BRI) data channel (B-channel) | 64 kbit/s | 8 kB/s |
| ISDN Basic Rate Interface (BRI) signalling channel (D-channel) | 16 kbit/s | 2 kB/s |
| ISDN Primary Rate Interface (PRI) data channel (B-channel) | 64 kbit/s | 8 kB/s |
| ISDN Primary Rate Interface (PRI) signalling channel (D-channel) | 64 kbit/s | 8 kB/s |
Note that effective aggregate bandwith for an ISDN installation is typically higher than the rates shown for a single channel due to the use of multiple channels. [5].
Computer buses | ||
| ISA 8-Bit/4.77 MHz[6] | 9.6 Mbit/s | 1.2 MB/s |
| Zorro II 16-Bit/7.14 MHz[7] | 28.56 Mbit/s | 3.56 MB/s |
| ISA 16-Bit/8.33 MHz[6] | 42.4 Mbit/s | 5.3 MB/s |
| Low Pin Count | 133.33 Mbit/s | 16.67 MB/s |
| HP-Precision Bus | 23 MB/s | |
| EISA 8-16-32bits/8.33 MHz | 320 Mbit/s | 32 MB/s |
| VME64 32-64bits | 400 Mbit/s | 40 MB/s |
| NuBus 10MHz | 400 Mbit/s | 40 MB/s |
| DEC TURBOchannel 32-bit/12.5 MHz | 400 Mbit/s | 50 MB/s |
| MCA 16-32bits/10 MHz | 660 Mbit/s | 66 MB/s |
| NuBus90 20MHz | 800 Mbit/s | 80 MB/s |
| Sbus 32-bit/25 MHz | 800 Mbit/s | 100 MB/s |
| DEC TURBOchannel 32-bit/25 MHz | 800 Mbit/s | 100 MB/s |
| PCI 32-bit/33 MHz | 1.06666 Gbit/s | 133.33 MB/s |
| HP GSC-1X | 142 MB/s | |
| Sbus 64-bit/25 MHz | 1.6 Gbit/s | 200 MB/s |
| PCI Express (x1 link)[8] | 2.5 Gbit/s | 250 MB/s |
| HP GSC-2X | 256 MB/s | |
| PCI 64-bit/33 MHz | 2.13333 Gbit/s | 266.66 MB/s |
| PCI 32-bit/66 MHz | 2.13333 Gbit/s | 266.66 MB/s |
| AGP 1x | 2.13333 Gbit/s | 266.66 MB/s |
| AGP 2x | 4.26666 Gbit/s | 533.33 MB/s |
| PCI 64-bit/66 MHz | 4.26666 Gbit/s | 533.33 MB/s |
| PCI-X DDR 16-bit | 4.26666 Gbit/s | 533.33 MB/s |
| PCI 64-bit/100 MHz | 6.39999 Gbit/s | 799.99 MB/s |
| PCI Express (x4 link)[8] | 10 Gbit/s | 1.00 GB/s |
| AGP 4x | 8.53333 Gbit/s | 1.06666 GB/s |
| PCI-X 133 | 8.53333 Gbit/s | 1.06666 GB/s |
| PCI-X QDR 16-bit | 8.53333 Gbit/s | 1.06666 GB/s |
| InfiniBand single 4X[9] | 10 Gbit/s | 1.25 GB/s |
| UPA | 1.92 GB/s | |
| PCI Express (x8 link)[8] | 20 Gbit/s | 2 GB/s |
| AGP 8x | 17.066 Gbit/s | 2.133 GB/s |
| PCI-X DDR | 17.066 Gbit/s | 2.133 GB/s |
| PCI Express (x16 link)[8] | 40 Gbit/s | 4 GB/s |
| PCI-X QDR | 34.133 Gbit/s | 4.266 GB/s |
| AGP 8x 64-bit | 34.133 Gbit/s | 4.266 GB/s |
| HyperTransport (800 MHz, 16-pair) | 51.2 Gbit/s | 6.4 GB/s |
| HyperTransport (1 GHz, 16-pair) | 64 Gbit/s | 8 GB/s |
| PCI Express 2.0 (x32 link)[10] | 160 Gbit/s | 16 GB/s |
| HyperTransport (2.8 GHz, 32-pair) | 179.2 Gbit/s | 22.4 GB/s |
Computer buses (storage) | ||
| PIO Mode 0 | 26.4 Mbit/s | 3.3 MB/s |
| SCSI 1 (5 MHz) | 40 Mbit/s | 5 MB/s |
| PIO Mode 1 | 41.6 Mbit/s | 5.2 MB/s |
| PIO Mode 2 | 66.4 Mbit/s | 8.3 MB/s |
| Fast SCSI 2 (8 bits/10 MHz) | 80 Mbit/s | 10 MB/s |
| PIO Mode 3 | 88.8 Mbit/s | 11.1 MB/s |
| PIO Mode 4 | 133.3 Mbit/s | 16.7 MB/s |
| Fast Wide SCSI 2 (16 bits/10 MHz) | 160 Mbit/s | 20 MB/s |
| Ultra DMA ATA 33 | 264 Mbit/s | 33 MB/s |
| Ultra Wide SCSI 40 (16 bits/20 MHz) | 320 Mbit/s | 40 MB/s |
| Ultra DMA ATA 66 | 528 Mbit/s | 66 MB/s |
| Ultra-2 wide SCSI 80 (16 bits/40 MHz) | 640 Mbit/s | 80 MB/s |
| Serial Storage Architecture SSA | 640 Mbit/s | 80 MB/s |
| Ultra DMA ATA 100 | 800 Mbit/s | 100 MB/s |
| Fibre Channel 1GFC (1.0625 GHz) | 850 Mbit/s | 106.25 MB/s |
| Ultra DMA ATA 133 | 1.064 Gbit/s | 133 MB/s |
| Serial ATA (SATA-150) | 1.2 Gbit/s | 150 MB/s |
| Ultra-3 SCSI 160 (16 bits/40 MHz DDR) | 1.28 Gbit/s | 160 MB/s |
| Fibre Channel 2GFC (2.125 GHz) | 1.7 Gbit/s | 212.5 MB/s |
| Serial ATA (SATA-300) | 2.4 Gbit/s | 300 MB/s |
| Serial Attached SCSI | 3 Gbit/s | 300 MB/s |
| Ultra-320 SCSI (16 bits/80 MHz DDR) | 2.56 Gbit/s | 320 MB/s |
| Fibre Channel 4GFC (4.25 GHz) | 3.4 Gbit/s | 425 MB/s |
| Serial Attached SCSI 2 | 6 Gbit/s | 600 MB/s |
| Ultra-640 SCSI (16 bits/160 MHz DDR) | 5.12 Gbit/s | 640 MB/s |
Note that [11], [12] and [13]
Computer buses (external) | ||
| Apple Desktop Bus | 10 kbit/s | 1.25 kB/s |
| MIDI | 31.25 kbit/s | 3.9 kB/s |
| Serial RS-232 max | 230.4 kbit/s | 28.8 kB/s |
| Parallel (Centronics) CPP ~133 kHz | 1 Mbit/s | 133 kB/s |
| USB Low Speed (USB 1.0) | 1.536 Mbit/s | 192 kB/s |
| Serial RS-422 max | 10 Mbit/s | 1.25 MB/s |
| USB Full Speed (USB 1.1) | 12 Mbit/s | 1.5 MB/s |
| Parallel (Centronics) EPP 2MHz | 16 Mbit/s | 2 MB/s |
| FireWire (IEEE 1394) 100 | 98.304 Mbit/s | 12.288 MB/s |
| FireWire (IEEE 1394) 200 | 196.608 Mbit/s | 24.576 MB/s |
| FireWire (IEEE 1394) 400 | 393.216 Mbit/s | 49.152 MB/s |
| USB Hi-Speed (USB 2.0) | 480 Mbit/s | 60 MB/s |
| FireWire (IEEE 1394b) 800 | 786.432 Mbit/s | 98.304 MB/s |
| FireWire (IEEE 1394b) 1600 | 1.572864 Gbit/s | 196.608 MB/s |
| Cameralink base 24bit 85MHz | 2.04 Gbit/s | 261.12 MB/s |
| FireWire (IEEE 1394b) 3200 | 3.145728 Gbit/s | 393.216 MB/s |
Note that [14].
Computer buses (MAC to PHY) | ||
| XAUI (4 Lanes) | 12.5 Gbps | |
| XGMII (32 Lanes) | 10.0 Gbps | |
Computer buses (PHY to XPDR) | ||
| XSBI (16 Lanes) | 0.9952 Gbps | |
Wireless device connection | ||
| IrDA-Control | 72 kbit/s | 9 kB/s |
| IrDA-SIR | 115.2 kbit/s | 14 kB/s |
| 802.15.4 (2.4 GHz) | 250 kbit/s | 31.25 kB/s |
| Bluetooth 1.1 | 1 Mbit/s | 125 kB/s |
| Bluetooth 2.0+EDR | 3 Mbit/s | 375 kB/s |
| IrDA-FIR | 4 Mbit/s | 0.51 MB/s |
| IrDA-VFIR | 16 Mbit/s | 2 MB/s |
| WUSB-UWB | 480 Mbit/s | 60 MB/s |
| 802.11 legacy 0.125 | 2 Mbit/s | 0.25 MB/s |
| RONJA free source optical wireless | 10 Mbit/s | 1.25 MB/s |
| 802.11b DSSS 0.125 | 11 Mbit/s | 1.375 MB/s |
| 802.11b+ non-standard DSSS 0.125 | 44 Mbit/s | 5.5 MB/s |
| 802.11a 0.75 | 54 Mbit/s | 6.75 MB/s |
| 802.11g DSSS 0.125 | 54 Mbit/s | 6.75 MB/s |
| 802.11n | 540 Mbit/s | 67.5 MB/s |
Mobile telephone interfaces | ||
| WiDEN | ' | |
| GSM CSD | 2.4 to 14.4 kbit/s | 0.3 to 1.8 kB/s |
| HSCSD upstream | 14.4 kbit/s | 1.8 kB/s |
| HSCSD downstream | 43.2 kbit/s | 5.4 kB/s |
| GPRS upstream | 28.8 kbit/s | 3.6 kB/s |
| GPRS downstream | 57.6 kbit/s | 7.2 kB/s |
| EDGE downstream | 236.8 kbit/s | 29.6 kB/s |
| UMTS downstream | 1920 kbit/s | 240 kB/s |
| HSDPA downstream | 1.8 Mbit/s to 14.4 Mbit/s | 225 kB/s to 1.8 MB/s |
| HSUPA downstream | ' | |
| HSOPA downstream | ' | |
| CDMA2000 1xRTT downstream | ' | |
| CDMA2000 1xRTT upstream | ' | |
| 1xEV-DO Rev. 0 downstream | 2.4576 Mbit/s | |
| 1xEV-DO Rev. 0 upstream | 0.15 Mbit/s | |
| 1xEV-DO Rev. A downstream | 3.1 Mbit/s | 396.8 kB/s |
| 1xEV-DO Rev. A upstream | 1.8 Mbit/s | 230.4 kB/s |
| 1xEV-DO Rev. B downstream | 73.5 Mbit/s | |
| 1xEV-DO Rev. B upstream | ' | |
| 1xEV-DO Rev. C downstream | 280 Mbit/s | |
| 1xEV-DO Rev. C upstream | ' | |
| DS0 | 64 kbit/s | 8 kB/s |
| Satellite Internet upstream | 64 kbit/s to 1 Mbit/s | 8 kB/s to 128 kB/s |
| Satellite Internet downstream | 128 kbit/s to 16 Mbit/s | 16 kB/s to 2 MB/s |
| Frame Relay | 8 kbit/s to 45 Mbit/s | 1 kB/s to 5.625 MB/s |
| G.SHDSL | 2.304 Mbit/s | 0.288 MB/s |
| SDSL | 64 kbit/s to 4.608 Mbit/s | 8 kB/s to 576 kB/s |
| G.Lite (aka ADSL Lite) upstream | 512 kbit/s | 64 kB/s |
| G.Lite (aka ADSL Lite) downstream | 1.5 Mbit/s | 192 kB/s |
| ADSL upstream | 64 kbit/s to 1.024 Mbit/s | 8 kB/s to 128 kB/s |
| ADSL downstream | 256 kbit/s to 8 Mbit/s | 32 kB/s to 1 MB/s |
| ADSL2 upstream | 64 kbit/s to 3.5 Mbit/s | 8 kB/s to 448 kB/s |
| ADSL2 downstream | 256 kbit/s to 12 Mbit/s | 32 kB/s to 1.5 MB/s |
| ADSL2Plus upstream | 64 kbit/s to 3.5 Mbit/s | 8 kB/s to 448 kB/s |
| ADSL2Plus downstream | 256 kbit/s to 24 Mbit/s | 32 kB/s to 3 MB/s |
| DOCSIS v1.0 (Cable Modem) upstream | 10 Mbit/s | 1.25 MB/s |
| DOCSIS v1.0 (Cable Modem) downstream | 38 Mbit/s | 4.75 MB/s |
| DOCSIS v2.0 (Cable Modem) upstream | 30 Mbit/s | 3.75 MB/s |
| DOCSIS v2.0 (Cable Modem) downstream | 40 Mbit/s | 5 MB/s |
| DOCSIS v3.0 (Cable Modem) upstream | 120 Mbit/s | 15 MB/s |
| DOCSIS v3.0 (Cable Modem) downstream | 160 Mbit/s | 20 MB/s |
| DS1/T1 | 1.544 Mbit/s | 192.5 kB/s |
| E1 | 2.048 Mbit/s | 256 kB/s |
| T2 | 6.312 Mbit/s | 789 KB/s |
| E2 | 8.448 Mbit/s | 1.056 MB/s |
| E3 | 34.368 Mbit/s | 4.296 MB/s |
| DS3/T3 ('45 Meg') | 44.736 Mbit/s | 5.5925 MB/s |
| STS-1/EC-1/OC-1/STM-0 | 51.84 Mbit/s | 6.48 MB/s |
| VDSL (symmetry optional) | 12 Mbit/s to 100 Mbit/s | 1.5 MB/s to 12.5 MB/s |
| VDSL2 (symmetry optional) | 12 Mbit/s to 250 Mbit/s | 1.5 MB/s to 31.25 MB/s |
| LR-VDSL2 (4 to 5 km [long-]range) (symmetry optional) | 1 Mbit/s to 4 Mbit/s | 128 kB/s to 512 kB/s |
| OC-1 | 51.84 Mbit/s | 6.48 MB/s |
| OC-3/STM-1 | 155.52 Mbit/s | 19.44 MB/s |
| T4 | 274.176 Mbit/s | 34.272 MB/s |
| T5 | 400.352 Mbit/s | 50.044 MB/s |
| OC-9 | 466.56 Mbit/s | 58.32 MB/s |
| OC-12/STM-4 | 622.08 Mbit/s | 77.76 MB/s |
| OC-18 | 933.12 Mbit/s | 116.64 MB/s |
| OC-24 | 1.244 Gbit/s | 155.5 MB/s |
| OC-36 | 1.9 Gbit/s | 237.5 MB/s |
| OC-48/STM-16 | 2.48832 Gbit/s | 311.04 MB/s |
| OC-96 | 4.976 Gbit/s | 622 MB/s |
| OC-192/STM-64 | 9.95328 Gbit/s | 1.24416 GB/s |
| 10 Gigabit Ethernet WAN PHY | 9.95328 Gbit/s | 1.24416 GB/s |
| 10 Gigabit Ethernet LAN PHY | 10 Gbit/s | 1.25 GB/s |
| OC-256 | 13.271 Gbit/s | 1.65888 GB/s |
| OC-768/STM-256 | 39.81312 Gbit/s | 4.97664 GB/s |
| OC-1536/STM-512 | 79.626 Gbit/s | 9.95325 GB/s |
| OC-3072/STM-1024 | 159.252 Gbit/s | 19.9065 GB/s |
| LocalTalk | 230.1 kbit/s | 28.8 kB/s |
| Econet | 800 kbit/s | 100 kB/s |
| ARCNET (Standard) | 2.5 Mbit/s | 0.3125 MB/s |
| Ethernet Experimental | 3 Mb/s | 0.375 MB/s |
| Token Ring (Original) | 4.16 Mbit/s | 0.52 MB/s |
| Ethernet (10base-X) | 10 Mbit/s | 1.25 MB/s |
| Token Ring (Later) | 16 Mbit/s | 2 MB/s |
| Fast Ethernet (100base-X) | 100 Mbit/s | 12.5 MB/s |
| FDDI | 100 Mbit/s | 12.5 MB/s |
| Gigabit Ethernet (1000base-X) | 1 Gbit/s | 125 MB/s |
| Myrinet 2000 | 2 Gbit/s | 250 MB/s |
| Infiniband 1X[9] | 2.5 Gbit/s | 312 MB/s |
| 10 gigabit Ethernet (10Gbase-X) | 10 Gbit/s | 1.25 GB/s |
| Myri 10G | 10 Gbit/s | 1.25 GB/s |
| Infiniband 4X[9] | 10 Gbit/s | 1.25 GB/s |
| Scalable Coherent Interconnect (SCI) Dual Channel SCI, x8 PCIe | 20 Gbit/s | 2.5 GB/s |
| Infiniband 12X[9] | 30 Gbit/s | 3.75 GB/s |
| 100 gigabit Ethernet (100Gbase-X) | 100 Gbit/s | 12.5 GB/s |
Memory Interconnect Buses / RAM | ||
| SPARC MBus | 2.55 Gbit/s | 0.32 GB/s |
| PC66 SDRAM | 4.264 Gbit/s | 0.533 GB/s |
| PC100 SDRAM | 6.4 Gbit/s | 0.8 GB/s |
| HP Runway bus 125MHz 64-bit | 6.4 Gbit/s | 0.8 GB/s |
| PC133 SDRAM | 8.528 Gbit/s | 1.066 GB/s |
| PC800 RDRAM (single-channel) | 12.8 Gbit/s | 1.6 GB/s |
| PC1600 DDR-SDRAM (single channel) | 12.8 Gbit/s | 1.6 GB/s |
| HP Runway bus 125MHz 64-bit DDR | 16 Gbit/s | 2 GB/s |
| PC1066 RDRAM (single-channel) | 16.8 Gbit/s | 2.1 GB/s |
| PC2100 DDR-SDRAM (single channel) | 16.8 Gbit/s | 2.1 GB/s |
| PC1200 RDRAM (single-channel) | 19.2 Gbit/s | 2.4 GB/s |
| PC2700 DDR-SDRAM (single channel) | 21.6 Gbit/s | 2.7 GB/s |
| PC800 RDRAM (dual-channel) | 25.6 Gbit/s | 3.2 GB/s |
| PC1600 DDR-SDRAM (dual channel) | 25.6 Gbit/s | 3.2 GB/s |
| PC3200 DDR-SDRAM (single channel) | 25.6 Gbit/s | 3.2 GB/s |
| PC2-3200 DDR2-SDRAM (single channel) | 25.6 Gbit/s | 3.2 GB/s |
| PC1066 RDRAM (dual-channel) | 33.6 Gbit/s | 4.2 GB/s |
| PC2100 DDR-SDRAM (dual channel) | 33.6 Gbit/s | 4.2 GB/s |
| PC2-4200 DDR2-SDRAM (single channel) | 34.136 Gbit/s | 4.267 GB/s |
| PC4000 DDR-SDRAM (single channel) | 34.3 Gbit/s | 4.287 GB/s |
| PC1200 RDRAM (dual-channel) | 38.4 Gbit/s | 4.8 GB/s |
| PC2-5400 DDR2-SDRAM (single channel) | 42.664 Gbit/s | 5.333 GB/s |
| PC2700 DDR-SDRAM (dual channel) | 43.2 Gbit/s | 5.4 GB/s |
| PC3200 DDR-SDRAM (dual channel) | 51.2 Gbit/s | 6.4 GB/s |
| PC2-3200 DDR2-SDRAM (dual channel) | 51.2 Gbit/s | 6.4 GB/s |
| PC2-6400 DDR2-SDRAM (single channel) | 51.2 Gbit/s | 6.4 GB/s |
| Itanium zx1 bus | 51.2 Gbit/s | 6.4 GB/s |
| Prototype DDR3-SDRAM | (?) 68.224 Gbit/s | (?) 8.528 GB/s |
| PC2-4200 DDR2-SDRAM (dual channel) | 68.272 Gbit/s | 8.534 GB/s |
| PC4000 DDR-SDRAM (dual channel) | 68.6 Gbit/s | 8.575 GB/s |
| PC2-5400 DDR2-SDRAM (dual channel) | 85.328 Gbit/s | 10.666 GB/s |
| PC2-6400 DDR2-SDRAM (dual channel) | 102.4 Gbit/s | 12.8 GB/s |
Notes
- ^ In telecommunications, 1 kbit/s = 1 000 bit/s, NOT 1 024 bit/s. Thus, all values below use metric prefixes. See this section. Similarly, kB, MB, GB mean kilobytes, megabytes, gigabytes, not kibibytes, mebibytes, gibibytes.
- ^ TTY uses Baudot code, not ASCII. This uses 5 bits per character instead of 8, and one start and 1.5 stop bits.
- ^ a b c d 56K modems: V.90 and V.92 capacity can only be achieved when the upstream (service provider) end of the connection is digital. In addition, certain telecommunications administrations limit the signal strength the modem can transmit onto the telecommunications circuit, which in turn limits the actual maximum data rate to less than the theoretical maximum. In the USA, this limited the possible downstream maximum to 53.3 kbit/s.
- ^ Serial, 1 start bit, 8 data bits, 1 stop bit: therefore 10 bits needed to transmit each byte. The exception is 110 baud which uses 2 stop bits or 11 bits per byte. Therefore, while the byte column reflects the net data transfer rate without the protocol overhead; actual transfer rate is slightly higher.
- ^ ISDN: A basic rate interface (BRI) provides 2 'B' channels and one 'D' channel. Each B channel provides 64 kbit/s bandwidth and the 'D' channel carries signalling (call setup) information. B channels can be bonded to provide a 128 kbit/s data rate. Primary rate interfaces (PRI) vary depending on whether the region uses E1 (Europe, world) or T1 (North America) bearers. In E1 regions, the PRI carries 30 B-channels and 1 D-channel; in T1 regions the PRI carries 23 B-channels and 1 D-channel. The D-channel has different bandwidth on the two interfaces.
- ^ a b http://www.csn.ul.ie/~stephen/buses.html#isa
- ^ The Zorro II bus use 4 clocks per 16-Bit of data transferred. See the Zorro III technical specification for more information.
- ^ a b c d Note that PCI Express lanes use an 8B/10B encoding scheme.
- ^ a b c d Note that these Infiniband performance figures, as with most one tends to read, are given as full-duplex combined (or "aggregated") speeds, which effectively doubles InfiniBand's numbers as compared to the simplex numbers usually quoted for other standards. Also, InfiniBand uses an 8B/10B encoding scheme.
- ^ PCIe 2.0 effectively doubles the bus standard's bandwidth from 2.5 Gbit/s to 5 Gbit/s
- ^ SATA and SAS use an 8B/10B encoding scheme.
- ^ Fibre Channel 1GFC, 2GFC, 4GFC use an 8B/10B encoding scheme.
- ^ Fibre Channel 10GFC uses a 64B/66B encoding scheme, is not compatible with 1GFC, 2GFC and 4GFC, and is used only to interconnect switches.
- ^ FireWire (IEEE 1394b) uses an 8B/10B coding scheme.
- The BYTES column contains an idealised throughput because it ignores protocol overhead and simply counts transferred bits in 8 bytes groups. This amount contains not only "useful data" for the transfer endpoint but includes any "system data" the transfer uses to encode, control, verify or correct the transferred "useful data", thus the perceived transfer rate is always lower than the value indicated.
- Actual frame relay connections will vary in throughput from 8 kbit/s to 45 Mbit/s depending on configuration. Most commonly below 2 Mbit/s.
- ADSL connections will vary in throughput from 64 kbit/s to several Mbit/s depending on configuration. Most commonly below 2 Mbit/s. Some ADSL & SDSL connections have a higher bandwidth than T1 but their bandwidth is not guaranteed, and will drop when the system gets overloaded where as the T1 type connections are usually guaranteed & have no contention ratios.
- DOCSIS 1.0 specifications include technology that was available in the 1995–1996 timeframe, and have become very widely deployed around the world.
- DOCSIS 1.1 specifications provide improved operational flexibility, security, and Quality-of-Service (QoS) features that enable real-time services.
- DOCSIS 2.0 specifications provide dramatically increased upstream throughput for symmetric services.
- DOCSIS 3.0 specifications are currently in development at CableLabs and will include a number of enhancements, most notably, channel bonding and support for IPv6. Channel bonding provides cable operators with a flexible way to increase upstream and downstream throughput to customers, with data rates in the hundreds of megabits and potentially gigabits per second.
- Satellite internet may have a high bandwidth but also has a high latency due to the distance between the modem, satellite & hub. One-way satellite connections exist where all the downstream traffic is handled by satellite and the upstream traffic by land-based connections such as 56K modems & ISDN.
- Some speeds in the list appear to be incorrect in comparison, Eg: The marketed speed for Gigabit Ethernet is known to be its full-duplex combined speed. Compared to most other listed datarates where the simplex rate is used. Eg: Fast Ethernet is 100 Mbit/s but can achieve 200 Mbit/s combined speed.