Here it is a collection of informations about speed on wires or air applied on PCs.
It comes from my curiosity that sometimes asked “is it better USB 2 or Firewire? Sata or SCSI or SAS?”
Pay attention because these speed is maximum bus speed, but in reality it depends on physical devices limits.
Note: Mb/s means Mega bits per second, MB/s means Mega Bytes per second, Gb/s means Giga bits per second.

Velocità su cavo e in aria

Di seguito c’è un insieme di informazioni sulle velocità dei dati che viaggiano su cavo o in aria.
E’ partito tutto dalla curiosità di sapere ad esempio “meglio USB 2 o Firewire? Sata o SCSI o SAS?”
Fate attenzione perché queste velocità sono le massime velocità del bus, ma in realtà tutto dipende dal limite fisico dei device.
Nota: Mb/s sta per Mega bits al secondo, MB/s significa Mega Bytes al secondo, Gb/s sta per Giga bits al secondo.

USB

  • USB 1.0: 1.5 Mb/s
  • USB 1.1: 12 Mb/s
  • USB 2.0: 480 Mb/s
  • USB 3.0: 4800 Mb/s

[Maximum 5 hubs connected together, maximum 127 peripherals. Maximum cable length: 50 m]

Firewire 400

  • S100: about 98 Mb/s
  • S200: about 197 Mb/s
  • S400: about 393 Mb/s

[Maximum cable length: 4.5 m or 72 m only with regenerative devices]

Firewire 800

  • S800: about 786 Mb/s

[Maximum category 5 cable length: 100 m]

Parallel ATA (PATA)

  • UDMA 0: about 16.7 MB/s
  • UDMA 1: about 25.0 MB/s
  • UDMA 2: about 33.3 MB/s
  • UDMA 3: about 44.4 MB/s
  • UDMA 4: about 533.6 Mb/s – 66.7 MB/s
  • UDMA 5: about 800.0 Mb/s – 100.0 MB/s
  • UDMA 6: about 1026.0 Mb/s – 133.0 MB/s

Serial ATA (SATA)

  • SATA I: about 1.2 Gb/s – 150 MB/s
  • SATA II: about 2.4 Gb/s – 300 MB/s

Parallel SCSI

  • SCSI-1: 5 MB/s
  • Fast SCSI: 10 MB/s
  • Wide SCSI: 20 MB/s
  • Ultra SCSI: 20 MB/s
  • Ultra Wide SCSI: 40 MB/s
  • Ultra2 SCSI: 40 MB/s
  • Ultra2 Wide SCSI: 80 MB/s
  • Ultra3 SCSI: 160 MB/s
  • Ultra320 SCSI: 320 MB/s
  • Ultra360 SCSI: 640 MB/s

Serial Attached SCSI (SAS)

1.5 Gb/s, 3.0 Gb/s, 6.0 Gb/s

Internet SCSI (iSCSI)

Implementation/network-dependent.

Fibre Channel (FC)

1 Gb/s, 2 Gb/s, 4 Gb/s, 8 Gb/s

Ethernet

10 Mb/s – 1.25 MB/s, 100 Mb/s – 12.5 MB/s, 1 Gb/s – 125 MB/s, 10 Gb/s – 1250 MB/s

Infrared Data Association (IrDA)

2.4 kbit/s to 16 Mbit/s, 100 Mbit/s data rates are under development.

Bluetooth

  • Bluetooth 1.1, Bluetooth 1.2: 721 Kb/s
  • Bluetooth 2.0: 2.1 Mb/s

802.11x

  • 802.11a: 54 Mb/s (Typical: 24.7 Mb/s)
  • 802.11b: 11 Mb/s (Typical: 5.9 Mb/s on TCP, 7.1 Mb/s on UDP)
  • 802.11g: 54 Mb/s (Typical: 24.7 Mb/s); another version of 802.11g called SuperG has 108 Mb/s theoretical data rate
  • 802.11n: 540 Mb/s (Typical: 200 Mb/s)

Please inform me about mistakes.

Per favore, informatemi di eventuali errori.