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Encyclopedia > FireWire
FireWire

Year created: 1995
Created by: Apple

Width: 1 bit
Number of devices: 63
Capacity 400Mbit/s, 800Mbit/s
Style: Serial
Hotplugging? Yes
External? Yes
The 6-pin and 4-pin FireWire 400 Connectors
The 6-pin and 4-pin FireWire 400 Connectors
The alternative ethernet-style cabling used by 1394c
The alternative ethernet-style cabling used by 1394c

FireWire is Apple Inc.'s brand name for the IEEE 1394 interface (although the 1394 standard also defines a backplane interface). It is also known as i.LINK (Sony's name) and DV (Panasonic's name, not to be confused with DV camcorder tapes). It is a serial bus interface standard, for high-speed communications and isochronous real-time data transfer, frequently used in a personal computer (and digital audio and digital video). Image File history File links Firewire_Icon. ... Apple Inc. ... This article is about the unit of information. ... In telecommunications and computer science, serial communications is the process of sending data one bit at one time, sequentially, over a communications channel or computer bus. ... Image File history File links FireWire-46_Diagram. ... Image File history File links FireWire-46_Diagram. ... Image File history File links This is a lossless scalable vector image. ... Image File history File links This is a lossless scalable vector image. ... Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). ... Apple Inc. ... This article is about brands in marketing. ... Not to be confused with the Institution of Electrical Engineers (IEE). ... A backplane is a circuit board (usually a printed circuit board) that connects several connectors in parallel to each other, so that each pin of each connector is linked to the same relative pin of all the other connectors, forming a computer bus. ... Sony Corporation ) is a Japanese multinational corporation and one of the worlds largest media conglomerates with revenue of $66. ... Panasonic is an international brand name for Japanese electric products manufacturer Matsushita Electric Industrial Co. ... A MiniDV Camcorder For other uses, see DV (disambiguation). ... In telecommunications and computer science, serial communications is the process of sending data one bit at one time, sequentially, over a communications channel or computer bus. ... In telecommunication, an interface standard is a standard that describes one or more functional characteristics (such as code conversion, line assignments, or protocol compliance) or physical characteristics (such as electrical, mechanical, or optical characteristics) necessary to allow the exchange of information between two or more (usually different) systems or equipment. ... Isochronous means having an equal time difference or occurring simultaneously. ... Digital audio comprises audio signals stored in a digital format. ... Digital video is a type of video recording system that works by using a digital, rather than analog, of the video signal. ...


FireWire has replaced Parallel SCSI in many applications, due to lower implementation costs and a simplified, more adaptable cabling system. IEEE 1394 has been adopted as the High Definition Audio-Video Network Alliance (HANA) standard connection interface for A/V (audio/visual) component communication and control[1]. FireWire is also available in wireless, fiber optic, and coaxial versions using the isochronous protocols. SCSI stands for Small Computer System Interface, and is a standard interface for transferring data between devices on a computer bus. ... Look up Implementation in Wiktionary, the free dictionary. ... A cable is two or more wires bound together which may be bare or covered or insulated. ... High Definition Audio-Video Network Alliance, or HANA, is a media industry group of leading companies established to create a design guideline for secure high-definition audio-visual networks. ...


Almost all modern digital camcorders have included this connection since 1995. Since 2003 many computers intended for home or professional audio/video use have built-in FireWire/i.LINK ports, including all Sony computers, all but one of Apple's computers (and many of its older iPods), and most Dell and HP models currently produced. It is also available on many retail motherboards for do-it-yourself PCs. Sony DV Handycam A camcorder is a portable electronic device for recording video images and audio onto an internal storage device. ... Sony Corporation ) is a Japanese multinational corporation and one of the worlds largest media conglomerates with revenue of $66. ... Apple Inc. ... iPod is a brand of portable media players designed and marketed by Apple and launched in October 2001. ... This article is about the corporation Dell, Inc. ... The Hewlett-Packard Company (NYSE: HPQ), commonly known as HP, is a very large, global company headquartered in Palo Alto, California, United States. ...

Contents

History and development

4-pin (left) and 6-pin (right) FireWire 400 connectors
4-pin (left) and 6-pin (right) FireWire 400 connectors
6-pin FireWire 400 connector on the edge of an expansion card
6-pin FireWire 400 connector on the edge of an expansion card

FireWire is Apple Inc.'s name for the IEEE 1394 High Speed Serial Bus. It was initiated by Apple and developed by the IEEE P1394 Working Group, largely driven by contributions from Apple, although major contributions were also made by engineers from Texas Instruments, Sony, Digital Equipment Corporation, IBM, and INMOS/SGS Thomson (now STMicroelectronics). Image File history File linksMetadata Download high-resolution version (1351x901, 293 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): FireWire Metadata This file contains additional information, probably added from the digital camera or scanner used to create... Image File history File linksMetadata Download high-resolution version (1351x901, 293 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): FireWire Metadata This file contains additional information, probably added from the digital camera or scanner used to create... Image File history File links FireWire_gniazdo. ... Image File history File links FireWire_gniazdo. ... Apple Inc. ... Texas Instruments (NYSE: TXN), better known in the electronics industry (and popularly) as TI, is an American company based in Dallas, Texas, USA, renowned for developing and commercializing semiconductor and computer technology. ... Sony Corporation ) is a Japanese multinational corporation and one of the worlds largest media conglomerates with revenue of $66. ... Digital Equipment Corporation was a pioneering American company in the computer industry. ... For other uses, see IBM (disambiguation) and Big Blue. ... INMOS Ltd. ... SGS is a TLA that can stand for: SGS-ATES, later SGS Microelettronica, a former Italian company now merged into STMicroelectronics Société Générale de Surveillance (French for Inspection General Society) South Georgia and the South Sandwich Islands: ISO 3166 trigram South Georgia Survey, four expeditions (1951-1957... This article is about the media and entertainment company. ... STMicroelectronics is an international leading supplier of semiconductors. ...


Apple intended FireWire to be a serial replacement for the parallel SCSI (Small Computer System Interface) bus while also providing connectivity for digital audio and video equipment. Apple's development began in the late 1980's, later presented to the IEEE[2], and was completed in 1995. As of 2007, IEEE 1394 is a composite of four documents: the original IEEE Std. 1394-1995, the IEEE Std. 1394a-2000 amendment, the IEEE Std. 1394b-2002 amendment, and the IEEE Std. 1394c-2006 amendment. Work is underway to incorporate all four of those documents into new revision of the 1394 standard. Scuzzy redirects here. ... The Institute of Electrical and Electronics Engineers or IEEE (pronounced as eye-triple-ee) is an international non-profit, professional organization incorporated in the State of New York, United States. ... 2007 is a common year starting on Monday of the Gregorian calendar. ...


Sony's implementation of the system is known as "i.LINK" (fully incorporated in 1394a-2000), and uses only the four signal pins, omitting the two pins which provide power to the device in favor of a separate power connector on Sony's i.LINK products. The ports are sometimes labeled "S100" or "S400" to indicated speed in Mbps.


The system is commonly used for connection of data storage devices and DV (digital video) cameras, but is also popular in industrial systems for machine vision and professional audio systems. It is preferred over the more common USB for its greater effective speed and power distribution capabilities, and because it does not need a computer host. Perhaps more importantly, FireWire makes full use of all SCSI capabilities and, compared to USB 2.0 Hi-Speed, has higher sustained data transfer rates, especially on Apple Mac OS X (with more varied results on Windows, presumably since USB2 is Intel's answer to FireWire on Windows machines)[3][4], a feature especially important for audio and video editors. Many different consumer electronic devices can store data. ... A MiniDV Camcorder For other uses, see DV (disambiguation). ... Machine vision (MV) is the application of computer vision to industry and manufacturing. ... Note: USB may also mean upper sideband in radio. ... Note: USB may also mean upper sideband in radio. ...


However, the royalty which Apple Inc. and other patent holders initially demanded from users of FireWire (US$0.25 per end-user system) and the more expensive hardware needed to implement it (US$1–$2), both of which have since been dropped, have prevented FireWire from displacing USB in low-end mass-market computer peripherals, where cost of product is a major constraint.[5] Apple Inc. ... For other uses, see Patent (disambiguation). ... Economics and commerce define an end-user as the person who uses a product. ...


Technical specifications

FireWire can connect up to 63 peripherals in a tree topology (as opposed to Parallel SCSI's Electrical bus topology). It allows peer-to-peer device communication — such as communication between a scanner and a printer — to take place without using system memory or the CPU. FireWire also supports multiple hosts per bus. It is designed to support Plug-and-play and hot swapping. Its six-wire cable is more flexible than most Parallel SCSI cables and can supply up to 45 watts of power per port at up to 30 volts, allowing moderate-consumption devices to operate without a separate power supply. (As noted earlier, the Sony-branded i.LINK usually omits the power wiring of the cables and uses a 4-pin connector. Devices have to get their power by other means.) For an account of the words periphery and peripheral as they are used in biology, sociology, politics, computer hardware, and other fields, see the periphery disambiguation page. ... An electrical bus (sometimes spelled buss) is a physical electrical interface where many devices share the same electric connection. ... A peer-to-peer (or P2P) computer network is a network that relies on the computing power and bandwidth of the participants in the network rather than concentrating it in a relatively few servers. ... In computing, a scanner is a device which analyzes a physical image (such as a photograph, printed text, or handwriting) or an object (such as ornament) and converts it to a digital image. ... A computer printer, or more commonly a printer, produces a hard copy (permanent human-readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper or transparencies. ... CPU redirects here. ... Plug and Play is a term used in the computer field to describe a computers ability to have new devices, normally peripherals, added to it without having to restart the computer. ... Hot swapping or hot plugging is the ability to remove and replace components of a machine, usually a computer, while it is operating. ... For other uses, see Watt (disambiguation). ...


FireWire devices implement the ISO/IEC 13213 "configuration ROM" model for device configuration and identification, to provide plug-and-play capability. All FireWire devices are identified by an IEEE EUI-64 unique identifier (an extension of the 48-bit Ethernet MAC address format) in addition to well-known codes indicating the type of device and the protocols it supports. Plug and Play is a term used in the computer field to describe a computers ability to have new devices, normally peripherals, added to it without having to restart the computer. ... In computer networking a media access control address (MAC address) is a unique identifier attached to most forms of networking equipment. ... Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). ... In computer networking a Media Access Control address (MAC address) or Ethernet Hardware Address (EHA) or hardware address or adapter address is a quasi-unique identifier attached to most network adapters (NICs). ... For other senses of this word, see protocol. ...


Operating system support

Full support for IEEE 1394a and 1394b is available for FreeBSD, Linux, Apple Mac OS 8.6 through to Mac OS 9[6], and Mac OS X as well as NetBSD and Haiku. Microsoft Windows XP supports both, but as of Service Pack 2, each FireWire device will run at S100 (100 Mbit/second) speed. A download is available from Microsoft which enables devices rated at S400 or S800 speeds to operate at their rated speed.[7] Some FireWire hardware manufacturers also provide custom device drivers which replace the Microsoft OHCI host adapter driver stack, enabling S800-capable devices to run at full 800 Mbit/s transfer rates. Microsoft Windows Vista currently supports only 1394a, with 1394b support coming later in a service pack. (Vista SP1 RC1 is available from mid December 2007, with full release expected during the first quarter of 2008)[8] FreeBSD is a Unix-like free operating system descended from AT&T UNIX via the Berkeley Software Distribution (BSD) branch through the 386BSD and 4. ... This article is about operating systems that use the Linux kernel. ... Screenshot of Mac OS 8. ... Sherlock 2 for Mac OS 9 with the new metallic appearance Mac OS 9 is the final major release of Apples Classic Mac OS. Introduced on October 23, 1999, Apple positioned it as The Best Internet Operating System Ever, highlighting Sherlock 2s Internet search capabilities, integration with Apple... Mac OS X (pronounced ) is a line of graphical operating systems developed, marketed, and sold by Apple Inc. ... NetBSD is a freely redistributable, open source version of the Unix-like BSD computer operating system. ... The tone or style of this article or section may not be appropriate for Wikipedia. ... Microsoft Corporation, (NASDAQ: MSFT, HKSE: 4338) is a multinational computer technology corporation with global annual revenue of US$44. ... Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ... Windows Vista is a line of graphical operating systems used on personal computers, including home and business desktops, notebook computers, Tablet PCs, and media centers. ...


Cable system support

Cable TV providers (in the US, with digital systems) must, upon request of a customer, provide a high-definition capable cable box with a functional FireWire interface. This applies only to customers leasing high-definition capable cable boxes from said cable provider after April 1, 2004. The relevant law is CFR 76.640 Section 4 Subsections i and ii.[9] The interface can be used to display or record Cable TV, including HDTV programming.[10] A set-top box (STB) or set-top unit (STU) is a device that connects to a television and an external source of signal, turning the signal into content which is then displayed on the television screen. ... A set-top box (STB) or set-top unit (STU) is a device that connects to a television and an external source of signal, turning the signal into content which is then displayed on the television screen. ... is the 91st day of the year (92nd in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...


Node hierarchy

FireWire devices are organized at the bus in a tree topology. Each device has a unique self-id. One of the nodes is elected root node and always has the highest id. The self-ids are assigned during the self-id process, which happens after each bus reset. The order in which the self-ids are assigned is equivalent to traversing the tree in a depth-first, post-order manner. Depth-first search (DFS) is an algorithm for traversing or searching a tree, tree structure, or graph. ...


Standards and versions

FireWire 400 (IEEE 1394-1995)

A 6-Pin FireWire 400 connector
A 6-Pin FireWire 400 connector

FireWire 400 can transfer data between devices at 100, 200, or 400 Mbit/s half-duplex data rates (the actual transfer rates are 98.304, 196.608, and 393.216 Mbit/s, i.e. 12.288, 24.576 and 49.152 megabytes per second respectively). These different transfer modes are commonly referred to as S100, S200, and S400. File links The following pages link to this file: FireWire ... File links The following pages link to this file: FireWire ... A megabit per second (Mbps or Mbit/s or Mb/s) is a unit of data transmission equal to 1,024 kilobits per second or 1048576 bits per second. ... In telecommunications, duplex means two-way when referring to communications channels. ... A megabit per second (Mbps or Mbit/s or Mb/s) is a unit of data transmission equal to 1,024 kilobits per second or 1048576 bits per second. ... This article is about a unit of data. ...


Cable length is limited to 4.5 metres (14.8 ft), although up to 16 cables can be daisy chained using active repeaters, external hubs, or internal hubs often present in FireWire equipment. The S400 standard limits any configuration's maximum cable length to 72 meters. The 6-pin connector is commonly found on desktop computers, and can supply the connected device with power. The elementary meaning of daisy chain is a garland created from the daisy flower, generally as a childrens game. ...


The 6-pin powered connector adds power output to support external devices. Typically a device can pull about 7 to 8 watts from the port; however, the voltage varies significantly from different devices.[11] Voltage is specified as unregulated and should nominally be about 25 volts (range 24 to 30). Apple's implementation on laptops is typically related to battery power and can be as low as 9 V and more likely about 12 V.


Enhancements (IEEE 1394a-2000)

An amendment IEEE 1394a was released in 2000, which both clarified and enhanced the original specification. It added in support for asynchronous streaming, quicker bus reconfiguration, packet concatenation, and a power saving suspend mode. Streaming media is multimedia that is continuously received by, and normally displayed to, the end-user while it is being delivered by the provider. ...


1394a also standardized the 4 pin connector already widely in use. The 4-pin version is used on many consumer devices such as camcorders, laptops, and other small FireWire devices. Though fully data compatible with 6-pin interfaces, it lacks power connectors. 8mm Camcorder mini-DV Camcorder A camcorder is a portable electronic device (generally a digital camera) for recording images and audio onto a storage device. ...


FireWire 800 (IEEE 1394b-2002)

A 9-pin FireWire 800/3200 (IEEE 1394b) connector.
A 9-pin FireWire 800/3200 (IEEE 1394b) connector.

FireWire 800 (Apple's name for the 9-pin "S800 bilingual" version of the IEEE 1394b standard) was introduced commercially by Apple in 2003. This newer 1394 specification (1394b) and corresponding products allow a transfer rate of 786.432 Mbit/s full-duplex via a new encoding scheme termed beta mode. It is backwards compatible to the slower rates and 6-pin connectors of FireWire 400. However, while the IEEE 1394a and IEEE 1394b standards are compatible, FireWire 800's connector is different from FireWire 400's connector, making the legacy cables incompatible. A bilingual cable allows the connection of older devices to the newer port. Image File history File linksMetadata Download high resolution version (640x636, 31 KB) Summary a plastic FireWire 800 plug. ... Image File history File linksMetadata Download high resolution version (640x636, 31 KB) Summary a plastic FireWire 800 plug. ... A megabit per second (Mbps or Mbit/s or Mb/s) is a unit of data transmission equal to 1,024 kilobits per second or 1048576 bits per second. ... In telecommunications, duplex means two-way when referring to communications channels. ...


The full IEEE 1394b specification supports data rates up to 3200 Mbit/s over beta-mode or optical connections up to 100 metres in length. Standard Category 5e unshielded twisted pair supports 100 metres at S100. The original 1394 and 1394a standards used data/strobe (D/S) encoding (called legacy mode) on the signal wires, while 1394b adds a data encoding scheme called 8B10B (also referred to as beta mode). A megabit per second (Mbps or Mbit/s or Mb/s) is a unit of data transmission equal to 1,024 kilobits per second or 1048576 bits per second. ... This article is about the unit of length. ... Cat5 patch cable Category 5 cable, commonly known as Cat 5, is a twisted pair cable type designed for high signal integrity. ... It has been suggested that this article or section be merged into Twisted pair. ... This article is about the unit of length. ... Econdin the process of the receptor able to transmit data effectively and Data strobe encoding (or D/S encoding) is an encoding scheme for transmitting data in digital circuits. ... There are very few or no other articles that link to this one. ... In telecommunication 8B10B is a line code that maps 8-bit symbols to 10-bit symbols to achieve DC balance and bounded disparity, and yet provide enough state changes to allow reasonable clock recovery. ...


FireWire S3200 (name not yet set)

In December 2007, the 1394 Trade Association announced that products will soon be available using S3200 mode which was already (mostly) defined in 1394b. They will use the same 9-pin connectors as the existing FireWire 800 and will be fully compatible with existing S400 and S800 devices. The future products are intended to compete with the forthcoming USB 3.0.[12]


FireWire S800T (IEEE 1394c-2006)

FireWire is enhanced to share gigabit Category 5e cable

IEEE 1394c-2006 was published on June 8, 2007. File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... is the 159th day of the year (160th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ...


It provides the following improvements

  • A new port specification which provides 800 Mb/s over the same RJ45 connectors with Category 5e cable which is specified in IEEE 802.3 clause 40 (gigabit ethernet over copper twisted pair)
  • An automatic negotiation which allows the same port to connect to either IEEE Std 1394 or IEEE 802.3 (ethernet) devices.
  • Various minor updates to IEEE 1394b

Though the potential for a combined Ethernet and FireWire RJ45 port is intriguing, as of December 2007, there are no products or chipsets which include this capability. An 8P8C modular plug before having been crimped onto a cable Connector and cable The 8 Position 8 Contact (8P8C) modular plugs and jacks are communications connectors. ... Gigabit Ethernet (GbE or 1 GigE) is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second, as defined by the IEEE 802. ... IEEE 802. ... Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). ...


Future enhancements

Besides the short term shoring up of S3200 over the beta connector already discussed, future iterations of FireWire should bring a bump in speed to 6.4 Gb/s, use of single-mode fiber, and additional connectors such as the small multimedia interface.[13]


Comparison to USB

Although high-speed USB 2.0 runs at a higher signaling rate (480 Mbit/s) than FireWire 400, typical USB PC-hosts rarely exceed sustained transfers of 35 MB/s (280 Mb/s), with 30 MB/s (240 Mb/s) being more typical (the theoretical limit for a USB 2 high-speed bulk transfer is 53.125 MB/s). This is likely due to USB's reliance on the host-processor to manage low-level USB protocol, whereas FireWire automates the same tasks in the interface hardware. For example, the FireWire host interface supports memory-mapped devices, which allows high-level protocols to run without loading the host CPU with interrupts and buffer-copy operations.[14] This article is about a unit of data. ... The Megabit is a unit of information storage, abbreviated Mbit or sometimes Mb. ...


FireWire 800 is substantially faster than Hi-Speed USB.[15] USB redirects here. ...


Alternative uses for IEEE 1394

Aircraft

IEEE 1394b is used in military aircraft, where weight savings are desired; even four pairs of wires, to permit multiple redundancy, are far lighter than hundreds of discrete wires. Developed for use as the data bus on the F-22 Raptor, it is also used on the F-35 Lightning II.[16] NASA's Space Shuttle also uses IEEE 1394b to monitor debris (foam, ice) which may hit the vehicle during launch.[16] This standard should not be confused with the unrelated MIL-STD-1394B. F-22 redirects here. ... The F-35 Lightning II is a single-seat, single-engine, stealth-capable military strike fighter, a multi-role aircraft that can perform close air support, tactical bombing, and air-to-air combat. ... This article is about the space vehicle. ... MIL-STD-1394 and MIL-STD-1394B are Defense Standards, assigned as PROVISIONS FOR EVALUATING QUALITY OF CAP CROWNS by the United States Department of Defense, which control and maintain the specification. ...


Automobiles

IDB-1394 Customer Convenience Port (CCP) is the automotive version of the 1394 standard. [1]


Networking over FireWire

FireWire can be used for ad-hoc (terminals only, no routers) computer networks. Specifically, RFC 2734 specifies how to run IPv4 over the FireWire interface, and RFC 3146 specifies how to run IPv6. A computer network is an interconnection of a group of computers. ... Internet Protocol version 4 is the fourth iteration of the Internet Protocol (IP) and it is the first version of the protocol to be widely deployed. ... Internet Protocol version 6 (IPv6) is a network layer protocol for packet-switched internetworks. ...


Mac OS X, Linux, FreeBSD, and Windows XP include support for networking over FireWire. A network can be set up between two computers using a single standard FireWire cable, or by multiple computers through use of a hub. This is similar to Ethernet networks with the major differences being transfer speed, wire length, and the fact that standard FireWire cables can be used for point-to-point communication. Mac OS X (pronounced ) is a line of graphical operating systems developed, marketed, and sold by Apple Inc. ... This article is about operating systems that use the Linux kernel. ... FreeBSD is a Unix-like free operating system descended from AT&T UNIX via the Berkeley Software Distribution (BSD) branch through the 386BSD and 4. ... Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ... Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). ... This article does not cite any references or sources. ...


Note: this feature is not supported in Windows Vista.[17]


The PlayStation 2 console had an i.LINK-branded 1394 connector. This was used for networking until the release of an Ethernet adapter late in the console's lifespan, but was poorly supported by software. PS2 redirects here. ...


IIDC

IIDC (Instrumentation & Industrial Digital Camera) is the FireWire data format standard for live video, and what Apple's iSight A/V camera uses. The system was designed for machine vision systems,[18] but is also used for other computer vision applications and for some webcams. Although they are easily confused since they both run over FireWire, IIDC is different from, and incompatible with, the ordinary DV (Digital Video) camcorder protocol. iSight was a webcam developed and marketed by Apple Inc. ... Machine vision (MV) is the application of computer vision to industry and manufacturing. ... Computer vision is the science and technology of machines that see. ... A typical webcam Webcams are small cameras, (usually, though not always, video cameras) whose images can be accessed using the World Wide Web, instant messaging, or a PC video conferencing application. ...


DV

Main article: DV

Digital Video (DV) is a standard protocol used by nearly all digital camcorders. Nearly all DV cameras have a FireWire interface (usually a 4-pin). Labeling of the port varies by manufacturer, with Sony using either its i.LINK trademark or the letters 'DV'. Many digital video recorders have a "DV-input" FireWire connector (usually a 6-pin connector) which can be used to record video from a directly-connected DV camcorder ("computer-free"). A MiniDV Camcorder For other uses, see DV (disambiguation). ... A MiniDV Camcorder For other uses, see DV (disambiguation). ... For other senses of this word, see protocol. ... 8mm Camcorder mini-DV Camcorder A camcorder is a portable electronic device (generally a digital camera) for recording images and audio onto a storage device. ... Foxtel IQ, a digital video recorder and a satellite cable set-top box. ...


The protocol also allows remote control (play, rewind, etc.) of connected devices.


Security issues

Devices on a FireWire bus can communicate by direct memory access, where a device can use hardware to map internal memory to FireWire's "Physical Memory Space". The SBP-2 (Serial Bus Protocol 2) used by FireWire disk drives uses this capability to minimize interrupts and buffer copies. In SBP-2, the initiator (controlling device) sends a request by remotely writing a command into a specified area of the target's FireWire address space. This command usually includes buffer addresses in the initiator's FireWire "Physical Address Space", which the target is supposed to use for moving I/O data to and from the initiator. [19] Direct memory access (DMA) is a feature of modern computers that allows certain hardware subsystems within the computer to access system memory for reading and/or writing independently of the central processing unit. ... Serial Bus Protocol 2 (SBP-2) [1] standard is a transport protocol within Serial Bus, IEEE Std 1394-1995 (also known as FireWire or i. ...


On many implementations, particularly those like PCs and Macs using the popular OHCI, the mapping between the FireWire "Physical Memory Space" and device physical memory is done in hardware, without operating system intervention. While this enables high-speed and low-latency communication between data sources and sinks without unnecessary copying (such as between a video camera and a software video recording application, or between a disk drive and the application buffers), this can also be a security risk if untrustworthy devices are attached to the bus. For this reason, high-security installations will typically either purchase newer machines which map a virtual memory space to the FireWire "Physical Memory Space" (such as a Power Mac G5, or any Sun workstation), disable the OHCI hardware mapping between FireWire and device memory, physically disable the entire FireWire interface, or do not have FireWire at all. Open Host Controller Interface, or OHCI, is an open standard that allows a computer host to interact with FireWire and USB devices. ... The program thinks it has a large range of contiguous addresses; but in reality the parts it is currently using are scattered around RAM, and the inactive parts are saved in a disk file. ... Open Host Controller Interface, or OHCI, is an open standard that allows a computer host to interact with FireWire and USB devices. ...


This feature can also be used to debug a machine whose operating system has crashed, and in some systems for remote-console operations. On FreeBSD, the dcons driver provides both, using gdb as debugger. Under Linux, firescope[20] and fireproxy[21] exist. Debugging is a methodical process of finding and reducing the number of bugs, or defects, in a computer program or a piece of electronic hardware thus making it behave as expected. ... FreeBSD is a Unix-like free operating system descended from AT&T UNIX via the Berkeley Software Distribution (BSD) branch through the 386BSD and 4. ... The GNU Debugger, usually called just GDB, is the standard debugger for the GNU software system. ...


See also

High Definition Audio-Video Network Alliance, or HANA, is a media industry group of leading companies established to create a design guideline for secure high-definition audio-visual networks. ... Home Audio Video Interoperability (HAVi) is a connection to control Audio and Video hardware using FireWire. ... USB redirects here. ... The title given to this article is incorrect due to technical limitations. ... 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...

References

Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 346th day of the year (347th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... December 17 is the 351st day of the year (352nd in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 305th day of the year (306th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 353rd day of the year (354th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 338th day of the year (339th in leap years) in the Gregorian calendar. ... Aviation Week & Space Technology (often abbreviated as Aviation Week or AW&ST) is a weekly magazine. ... is the 36th day of the year in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ...

Other sources

  • IEEE p1394 Working Group (1996-08-30). IEEE Std 1394-1995 High Performance Serial Bus. IEEE. ISBN 1-5593-7583-3. 
  • IEEE p1394a Working Group (2000-06-30). IEEE Std 1394a-2000 High Performance Serial Bus - Amendment 1. IEEE. ISBN 0-7381-1958-X. 
  • IEEE p1394b Working Group (2002-12-14). IEEE Std 1394b-2002 High Performance Serial Bus - Amendment 2. IEEE. ISBN 0-7381-3253-5. 
  • IEEE p1394c Working Group (2007-06-08). IEEE Std 1394c-2006 High Performance Serial Bus - Amendment 3. IEEE. ISBN 0-7381-5237-4. 
  • INCITS T10 Project 1467D (2004). Information technology — Serial Bus Protocol 3 (SBP-3). ANSI INCITS. ANSI INCITS 375-2004. 
  • Anderson, Don (1999). FireWire System Architecture. MindShare, Inc.. ISBN 0-201-48535-4. 

External links

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL. This article does not cite any references or sources. ... “GFDL” redirects here. ...


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