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Are FireWire devices able to be connected in a daisy chain?

Are FireWire devices able to be connected in a daisy chain?

Are FireWire devices able to be connected in a daisy chain? First we need to explore FireWire and how it works before we can understand how the devices can and can't be connected. FireWire is the brand name of Apple Inc. for the IEEE 1394 interface. Another name for the product of FireWire is i.Link, which is the Sony brand name. FireWire is also called IEEE 1394, however the standard for the 1934 additionally defines a backplane interface. It is a serial bus interface standard for personal computers, as well as for digital audio and for digital video, that offers high speed communications and isochronous real time data services. Because of lower implementation costs plus a simplified more adaptable cabling system, FireWire has replaced Parallel SCSI in various applications. HANA, or the High Definition Audio-Video Network Alliance, has adopted IEEE 1394 as the standard connection interface for audio/video component control and communication. FireWire also comes in a coaxial, wireless, and fiber optic versions using the isochronous protocols.

FireWire4 is Apple Inc.'s brand name for the IEEE 1394 High Speed Serial Bus. It was started by Apple and created by the IEEE P1394 Working Group, which was mostly driven by contributions from Apple, although engineers from Texas Instruments, Digital Equipment Corporation, Sony, IBM, and St Microelectronics, which was INMOS/SGS Thomson, also made major contributions. FireWire was intended by Apple to become a parallel SCSI bus serial replacement while providing digital audio and video equipment connectivity as well. The development by Apple was finished in 1995. Currently in 2007, IEEE 1394 is a composite of three separate documents. These are the original 1995 IEEE standard 1394, the 2000 amendment to the original document, the IEEE Std 1394a, and the 2002 amendment to the original document, the IEEE Std 1394b. There is a third amendment planned, 1394c, which will provide support for 800 Mbit per second transmitted over 100m of unshielded twisted pair Category 5 cable, and has not been published yet, but will be available soon.

FireWire can connect up to 63 peripheral devices together in an acyclic topology, as compared to the Parallel SCSI's Electrical bus topology. It will allow peer-to-peer device communication to take place without using the system memory or the CPU. FireWire also has support for multiple hosts per bus. It was designed to support Plug-and-play and hot swapping. The six-wire FireWire cable has more flexibility than most of the Parallel SCSI cables available. FireWire can also supply up to 45 watts of power per port at up to 30 volts, which allows moderate-consumption devices to operate without utilizing a separate power supply. The exception is the Sony-branded i.Link, which usually omits the power wiring of the cables and uses a 4-pin connector. Power for the i.Link is provided by a separate power adaptor for each device. FireWire devices use the ISO/IEC 13213 "configuration ROM" model for the device configuration and identification, to provide the plug-and-play capability. All FireWire devices are identified by an IEEE EUI-64 unique identifier, which is an extension of the 48-bit Ethernet MAC address format, on top of the well-known codes that indicate the type of device and the protocols that the device supports.

Many of the computer systems and electronic systems available do not have the ability to be connected or disconnected while they are powered because this may cause damage to them. But devices that are classified as hot swappable devices, which includes FireWire, have the circuits and connectors that are designed to protect against this type of damage occurring. Hot swappable devices ensure the safety of the device in this type of circumstance. There have, however benn a few reports of video cameras being damaged because the pins of the FireWire port accidently short while swapping is occurring. These reports are commonly referring to the earliest version of FireWire, however, and the modern devices currently available on the market have eliminated this specific problem.

Now on to the question of whether the devices can be connected in a daisy chain. The answer is that yes, the devices can be connected in a daisy chain, and can be turned on and off as needed providing that the devices are designed according to the standard for FireWire. All of the devices in the daisy chain do not need to be powered on to utilize the last device in the chain. To get the optimum results connect one FireWire device to the Macintosh computer, then add one additional device at a time to the chain. This also helps to avoid overstressing the FireWire port. Always remember not to plug in a live power adapter to the devices connected to the chain.

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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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