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What is the data transfer speed for FireWire?

What is the data transfer speed for FireWire?

What is the data transfer speed for FireWire? To understand this, first we must understand what it is and the different versions of FireWire available. FireWire, i.Link, and IEEE 1394 are similar. FireWire is the brand of IEEE 1394 made by Apple Inc. and i.Link is the Sony Corporations' brand of IEEE 1394 implementation. The IEEE 1394 standard, however, defines a backplane interface. FireWire is a PC, or personal computer, as well as digital audio and digital video serial bus interface standard. It offers high speed communications and isochronous real-time data services. In many applications, FireWire has replaced Parallel SCSI due to the lower implementation costs and the easier, more adaptable cabling system. The standard that has been adopted as the High Definition Audio-Video Network Alliance (HANA) standard connection interface for A/V component communication and control is IEEE 1394. FireWire is also available in fiber optic, wireless, and coaxial versions using the same isochronous protocols.

Since 1995, almost all modern digital camcorders have included a FireWire connection. Many computers that are intended for home, as well as computers for professional audio/video use have built-in FireWire ports, including all Apple computers, most Dell computers, and all Sony laptop computers that are currently produced. FireWire is also widely available on retail motherboards for the DIY PCs, alongside the USB port. FireWire was used with beginning models of Apple's iPod, but the later models eliminated FireWire support in favor of USB because of space constraints and for a wider compatibility.

The first version of FireWire available is called FireWire 400. This connector has 6 pins and can transfer data at 100, 200, or 400 megabits per second, although the the actual transfer rates are 98.304, 196.608, and 393.216 megabits per second, or 288, 24.576 and 49.152 megaBytes per second respectively. These various transfer modes are commonly called S100, S200, and S400. Although USB 2.0 can operate at 480 megabytes per second in theory, the tests indicate that this speed is not usually attained. This could possibly be caused by the client-server architecture of USB, in comparison to the peer-to-peer network operation of FireWire, and the support for the memory-mapped devices in FireWire, which allows high-level protocols to run without forcing numerous interrupts and buffer copy operations on host CPUs. 4.5 meters, or 15 feet. is the cable length limit although up to 16 cables can be daisy chained by using active repeaters, external hubs, or internal hubs that are commonly present in FireWire equipment. The S400 standard limits any maximum cable length configuration to 72 meters. The 6-pin connector is usually found on desktop computers, and can supply power to the connected device. Many laptops and small FireWire devices use a 4-pin version and don't have any power connectors, although this version is fully compatible with 6-pin interfaces. Some laptops utilize the 6-pin powered connector, like Apple's recent products. The 6-pin powered connector adds power output to support external devices. Usually a device can pull around 7 or 8 watts from the port, however the voltage may vary significantly from different devices. Voltage should nominally be about 25 Volts, between 24 and 30, and is specified as unregulated. The implementation on Apple laptops is generally related to battery power, and may be as low as 9V but is more likely around 12 Volts.

FireWire 800 is another version of FireWire. This version has a 9 pin connector. FireWire 800, which is Apple's name for the 9-pin, S800 bilingual version of the IEEE 1394b standard, was commercially introduced in 2003 by Apple. This newer 1394 specification, and the corresponding products, will allow a transfer rate of 786.432 mega bits per second, with a backwards compatibility to the slower rates and 6-pin connectors of FireWire 400. The complete IEEE 1394b specification has support for optical connections up to 100 meters in length, and data transfer rates of up to 3.2 giga bits per second. At S100, standard Category-5 unshielded twisted pair cable will support 100 meters, and the new p1394c technology goes all the way up to S800. Data/strobe, or D/S, encoding was used on the signal wires in the original 1394 and 1394a standards, while standard 1394b adds a data encoding scheme that is called 8B10B, which is also referred to as beta mode.

So the answer to the question what is the data transfer speed is that the speed depends on which version you are using. FireWire 400 has speeds that vary from 100 to 400 mega bits per second, and FireWire 800 has a data transfer speed of over 786 mega bits per second.

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What is “Deep Color” and why is Deep Color so important? | What does the term xvYCC color standard mean? | What's so different between xvYCC color standard and Deep Color? | What is lip sync, and why is it important? | Two devices need to be connected with 20 feet of cable, but the cable available does not work at that length. Why? | Can a passive device that does not use any active electronics, like a mechanical switch box, be compliant? The cost is a lot less. | Do I have the ability to view BluRay and HD-DVD content in high definition if the digital monitor that I have is not equipped with an HDCP compatible connection? | What is FireWire? | What is i.Link? | What is the data transfer speed for FireWire? | How many FireWire devices can I connect at any one time? | Does FireWire have the “plug and play” capability? | What is FireWire Target Disk Mode? | Does the FireWire device need to be turned on before the device is connected to the FireWire port? | Are FireWire devices able to be connected in a daisy chain? | Does USB availability apply to mobile computers as well as desktop computers? | What is HDCP?

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