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Whether to use bit/s or byte/s is a matter of debate. The most commonly cited measurement is bolded. In general, Parallel interfaces are quoted in byte/s, Serial in bit/s.

Many of these figures are theoretical maximums, and various real-world considerations will generally keep the actual effective throughput much lower. See Measuring Data Throughput . The actual throughput achievable on Ethernet networks,for example (especially when heavily loaded), is a subject of hot debate.

__TOC__

''Note: In telecommunications, 1 kbit/s = 1 000 bit/s, NOT 1 024 bit/s. Thus, all values below use metric prefixes.''




















  • ( V.90 ) (downstream)

  • ( V.90 ) (upstream)

  • ( V.92 ) (downstream)

  • ( V.92 ) (upstream)



























































































































































    • CONNECTION BITS BYTES


    MODEM S

    (note: 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.)
    Modem 110 baud110 bit/s10 B/s
    Modem 300 baud ( V.21 )300 bit/s30 B/s
    Modem Bell 103 ( Bell 103 )300 bit/s30 B/s
    Modem 1200 ( V.22 )1.2 kbit/s120 B/s
    Modem Bell 212A ( Bell 212A )1.2 kbit/s120 B/s
    Modem 2400 ( V.22bis )2.4 kbit/s240 B/s
    Modem 9600 ( V.32 )9.6 kbit/s960 B/s
    Modem 14.4k ( V.32bis )14.4 kbit/s1,440 B/s
    Modem 19.2k ( V.32terbo )19.2 kbit/s1,920 B/s
    Modem 28.8k ( V.34 )28.8 kbit/s2,880 B/s
    Modem 33.6k ( V.34plus / V.34bis )33.6 kbit/s3,360 B/s
    56.0 kbit/s5.6 kB/s
    33.6 kbit/s3.36 kB/s
    56.0 kbit/s5.6 kB/s
    48.0 kbit/s4.8 kB/s



    ISDN

    64k ISDN 64.0 kbit/s8 kB/s
    128k dual-channel ISDN 128.0 kbit/s16 kB/s



    COMPUTER INTERFACES (INTERNAL)

    ISA 08-Bit/4.77Mhz38.66 Mbit/s4.83 MB/s
    ISA 16-Bit/8.33Mhz134.66 Mbit/s16.85 MB/s
    PCI 32-bit/33Mhz 1066.66 Mbit/s133.33 MB/s
    PCI Express (x1 link)2500 Mbit/s250 MB/s
    PCI 64-bit/33MHz 2133.33 Mbit/s266.66 MB/s
    PCI 32-bit/66MHz 2133.33 Mbit/s266.66 MB/s
    AGP 1x2133.33 Mbit/s266.66 MB/s
    AGP 2x4266.66 Mbit/s533.33 MB/s
    PCI 64-bit/66MHz 4266.66 Mbit/s533.33 MB/s
    PCI-X DDR 16-bit 4266.66Mbit/s533.33 MB/s
    PCI Express (x4 link)10000 Mbit/s1000 MB/s
    AGP 4x8533.33 Mbit/s1066.66 MB/s
    PCI-X 133 8533.33 Mbit/s1066.66 MB/s
    PCI-X QDR 16-bit 8533.33 Mbit/s1066.66 MB/s
    InfiniBand 10.00 Gbit/s1.25 GB/s
    PCI Express (x8 link)20.00 Gbit/s2.0 GB/s
    AGP 8x17.066 Gbit/s2.133 GB/s
    PCI-X DDR 17.066 Gbit/s2.133 GB/s
    PCI Express (x16 link)40.0 Gbit/s4.0 GB/s
    PCI-X QDR 34.133 Gbit/s4.266 GB/s
    HyperTransport (800MHz, 16-pair)51.2 Gbit/s6.4 GB/s
    HyperTransport (1GHz, 16-pair)64.0 Gbit/s8.0 GB/s


    Note that PCI Express lanes use a 10b/8b encoding scheme


    COMPUTER INTERFACES (DRIVE)

    SCSI 1 12.0 Mbit/s1.5 MB/s
    Fast SCSI 2 80 Mbit/s10 MB/s
    Fast Wide SCSI 2 160 Mbit/s20 MB/s
    Ultra DMA ATA 33264 Mbit/s33 MB/s
    Ultra Wide SCSI 40 320 Mbit/s40 MB/s
    Ultra DMA ATA 66528 Mbit/s66 MB/s
    Ultra-2 SCSI 80 640 Mbit/s80 MB/s
    Ultra DMA ATA 100800 Mbit/s100 MB/s
    Ultra DMA ATA 1331064 Mbit/s133 MB/s
    Serial ATA (SATA-150)1200 Mbit/s150 MB/s
    Ultra-3 SCSI 160 1280 Mbit/s160 MB/s
    Fibre Channel 800 or 1600 Mbit/s100 or 200 MB/s
    Serial ATA (SATA-300)2400 Mbit/s300 MB/s
    Ultra-320 SCSI 2560 Mbit/s320 MB/s
    Ultra-640 SCSI 5120 Mbit/s640 MB/s



    COMPUTER INTERFACES (EXTERNAL)

    Serial RS-232 commonly9.6 kbit/s960 B/s
    Serial RS-232 max230.4 kbit/s23.0 kB/s
    USB Low Speed1536 kbit/s192 kB/s
    Parallel ( Centronics )8.0 Mbit/s1.0 MB/s
    Serial RS-422 max10.0 Mbit/s1.25 MB/s
    USB Full Speed12.0 Mbit/s1.5 MB/s
    FireWire (IEEE 1394) 100100 Mbit/s12.5 MB/s
    FireWire (IEEE 1394) 200200 Mbit/s25 MB/s
    FireWire (IEEE 1394) 400400 Mbit/s50 MB/s
    USB Hi-Speed480 Mbit/s60 MB/s
    FireWire (IEEE 1394b) 800800 Mbit/s100 MB/s



    WIRELESS

    IrDA -Control72 kbit/s9 kB/s
    802.15.4 (2.4GHz)250 kbit/s31.25 kB/s
    Bluetooth 1.1 1000 kbit/s125 kB/s
    802.11 legacy 0.1252000 kbit/s250 kB/s
    Bluetooth 2 3 Mbit/s375 kB/s
    RONJA free source optical wireless10.00 Mbit/s1.25 MB/s
    802.11b DSSS 0.12511 Mbit/s1.375 MB/s
    802.11b+ non-standard DSSS 0.12544.0 Mbit/s5.5 MB/s
    802.11a 0.7554.00 Mbit/s6.75 MB/s
    802.11g DSSS 0.12554.00 Mbit/s6.75 MB/s
    802.11n 600 Mbit/s75 MB/s



    MOBILE TELEPHONE INTERFACES

    GSM CSD 2400 to 14400 bit/s300 to 1800 B/s
    HSCSD upstream14.4 kbit/s1800 B/s
    HSCSD downstream43.2 kbit/s5.4 kB/s
    GPRS upstream 28.8 kbit/s3.6 kB/s
    GPRS downstream 57.6 kbit/s7.2 kB/s
    UMTS downstream1920 kbit/s240 kB/s



    WIDE AREA NETWORK

    DS064 kbit/s8 kB/s
    Satellite Internet upstream64kbit/s to 1Mbit/s8 kB/s to 128 kB/s
    Satellite Internet downstream128kbit/s to 16Mbit/s16kB/s to 2 MB/s
    Frame Relay 8 kbit/s to 45 Mbit/s1 kB/s to 5.625 MB/s
    G.SHDSL 2.3040 Mbit/s0.288 MB/s
    SDSL 64 kbit/s to 4.608 Mbit/s8 kB/s to 0.576 MB/s
    G.Lite (aka ADSL Lite) upstream 512 kbit/s64 kB/s
    G.Lite (aka ADSL Lite) downstream 1.5 Mbit/s192 kB/s
    ADSL upstream 64 kbit/s to 1024 kbit/s8 kB/s to 128 kB/s
    ADSL downstream 256 kbit/s to 8 Mbit/s32 kB/s to 1 MB/s
    ADSL2 upstream 64 kbit/s to 3.5 Mbit/s8 kB/s to 448 kB/s
    ADSL2 downstream 256 kbit/s to 12 Mbit/s32 kB/s to 1.5 MB/s
    ADSL2Plus upstream 64 kbit/s to 3.5 Mbit/s8 kB/s to 448 kB/s
    ADSL2Plus downstream 256 kbit/s to 24 Mbit/s32 kB/s to 3.0 MB/s
    DOCSIS ( Cable Modem ) upstream 128 kbit/s to 8 Mbit/s16 kB/s to 1 MB/s
    DOCSIS ( Cable Modem ) downstream 384 kbit/s to 24 Mbit/s48 kB/s to 3 MB/s
    DS1/ T1 1.544 Mbit/s192.5 kB/s
    E1 2.048 Mbit/s256 kB/s
    E2 8.448 Mbit/s1.056 MB/s
    E3 34.368 Mbit/s4.296 MB/s
    DS3/ T3 ('45 Meg')44.736 Mbit/s5.5925 MB/s
    STS-1/EC-1/OC-1/STM-0 51.840 Mbit/s6.48 MB/s
    VDSL (symmetry optional)12 Mbit/s to 100 Mbit/s1.5 MB/s to 12.5 MB/s
    VDSL2 (symmetry optional)12 Mbit/s to 250 Mbit/s1.5 MB/s to 31.25 MB/s
    LR-VDSL2 (4 to 5 km {Link without Title} range) (symmetry optional)1 Mbit/s to 4 Mbit/s128 kB/s to 512 kB/s
    OC-3/STM-1 155.52 Mbit/s19.44 MB/s
    OC-12/STM-4 622.08 Mbit/s77.76 MB/s
    OC-48/STM-16 2.448320 Gbit/s306.104 MB/s
    OC-192/STM-64 9.953280 Gbit/s1.24416 GB/s
    10 Gigabit Ethernet WAN PHY 9.953280 Gbit/s1.24416 GB/s
    10 Gigabit Ethernet LAN PHY 10 Gbit/s1.25 GB/s
    OC-768/STM-256 39.813120 Gbit/s 4.97664 GB/s



    LOCAL AREA NETWORK

    LocalTalk 230.4 kbit/s28.8 kB/s
    ARCNET (Standard)2.5 Mbit/s0.3125 MB/s
    Token Ring (Original)4.16 Mbit/s0.52 MB/s
    Ethernet (10base-X)10 Mbit/s1.25 MB/s
    Token Ring (Later)16 Mbit/s2.0 MB/s
    Fast Ethernet (100base-X)100 Mbit/s12.5 MB/s
    FDDI 100 Mbit/s12.5 MB/s
    Gigabit Ethernet (1000base-X)1 Gbit/s125 MB/s
    10 Gigabit Ethernet (10Gbase-X)10 Gbit/s1250 MB/s



    MEMORY INTERCONNECT BUSES / RAM

    PC66 SDRAM 4264 Mbit/s533 MB/s
    PC100 SDRAM6400 Mbit/s800 MB/s
    PC133 SDRAM8528 Mbit/s1066 MB/s
    PC1600 DDR -SDRAM12.8 Gbit/s1.6 GB/s
    PC2100 DDR-SDRAM16.8 Gbit/s2.1 GB/s
    PC2700 DDR-SDRAM21.6 Gbit/s2.7 GB/s
    PC3200 DDR-SDRAM25.6 Gbit/s3.2 GB/s
    PC800 RDRAM (single-channel)12.8 Gbit/s1.6 GB/s
    PC800 RDRAM ( Dual-channel )25.6 Gbit/s3.2 GB/s
    PC1066 RDRAM (single-channel)16.8 Gbit/s2.1 GB/s
    PC1066 RDRAM (dual-channel)33.6 Gbit/s4.2 GB/s
    PC1200 RDRAM (single-channel)19.2 Gbit/s2.4 GB/s
    PC1200 RDRAM (dual-channel)38.4 Gbit/s4.8 GB/s
    PC2-3200 DDR2 -SDRAM25.6 Gbit/s3.2 GB/s
    PC2-4200 DDR2-SDRAM34.136 Gbit/s4.267 GB/s
    PC2-5400 DDR2-SDRAM42.664 Gbit/s5.333 GB/s
    PC2-6400 DDR2-SDRAM51.2 Gbit/s6.4 GB/s
    PC2-8500 DDR2-SDRAM68.264 Gbit/s8.533 GB/s
    2005-Feb Prototype DDR3 -SDRAM~68.224 Gbit/s~8.528 GB/s



    NOTES


    • 56K Modem 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 then the theoretical maximum. In the USA, this limited the possible downstream maximum to 53.3 kbit/s


    • 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 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.



    SEE ALSO