Firewire1394 vs.1394a.

Sirpa

Mitä eroa ieee1394,1394a ja 1394b:llä.
Mini dv kamerani (canon mv400)manuaali neuvoo käyttämään ieee 1394:ää.Käykö b kaapeli ,liitin? tuohon?

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    Anonyymi (Kirjaudu / Rekisteröidy)
    5000
    • aloittelija_

      Moi!

      Itsellä asiaan liittyviä kysymyksiä myös...koska olen vasta ajatellut ostaa kyseisenlaisen kameran.

      Mutta tiedätkö sivuston: www.digivideo.fi

      Siellä saattaa olla vastaus sinun kysymykseesi?

      Ainakin itse olen lueskellut sieltä jotain asiaa. Siellä taisi olla juuri tuohon liittyvää jotain tietoa!!! (mikäli muistan oikein)

      t-jaska

    • Fox

      A on vanhempi ja hitaampi 400 Mbps ja b on uusi versio, tuplanopea; 800 Mbps.

      Kaapelit eivät taida olla muuttuneet, mutta pitänee haeskella tuohon varmistus.

    • aloittelija_

      tuollaisen löysin:

      Alkuperäinen IEEE 1394 taisi olla virallisesti nimeltään IEEE 1394-1995. Tähän tehtiin 1998 jotain pieniä parannuksia säilyttäen uuden ja vanhan normin keskinäisen yhteensopivuuden ja uudelle normille annettiin nimeksi IEEE 1394a. Käytännössä on siis useimmiten tapana käyttää pelkkää IEEE 1394 nimitystä tästä ns. Firewire 400:sta.

      t-jaska

      • aloittelija_

        tuo unohtui äskeisestä:

        Mutta IEEE 1394b eli nopea Firewire 800 on sitten selkeästi jo täysin eri asia...

        t-jaska


      • aloittelija_
        aloittelija_ kirjoitti:

        tuo unohtui äskeisestä:

        Mutta IEEE 1394b eli nopea Firewire 800 on sitten selkeästi jo täysin eri asia...

        t-jaska

        Aiheeseen liittyen:

        Kysymys ja siihen vastaus:

        Does 1394 have a formal name?

        Yes - the name "FireWire" was trademarked by Apple Computer before the 1394 standard was published. Years later, the name "i.LINK" was trademarked by Sony. Both names are used widely today, and the 1394 Trade Association has been granted rights to license the use of these trademarks at no cost. Qualified products can also use a compliance logo based on these names, when licensed by the 1394 TA.
        #

        Where can I obtain a copy of the specification?

        The 1394-1995, 1394a-2000, and 1394b-2002 specifications are available only from the IEEE, and can be obtained through their web site at http://www.ieee.org.
        #

        What is the status of 1394a, and what does it achieve?

        IEEE 1394a is a supplement to the IEEE 1394-1995 standard, which promotes interoperability and performance while maintaining compatibility with existing products. It also clears up some ambiguities and undocumented features in the 1394-1995 version. IEEE 1394a was published in the year 2000 and given the formal name IEEE 1394a-2000.
        #

        What is 1394b, and when will it be available?

        IEEE 1394b is a significant enhancement to the basic 1394 specification that enables speed increases to 3.2 Gigabits/sec, supports distances of 100 meters on UTP-5, plastic optical fiber and glass optical fiber, and significantly reduces latency times by using arbitration pipelining. It is fully backwards compatible with the 1394-1995 and 1394a-2000 specifications. 1394b provides the speed and distance necessary to implement a home backbone for AV and Internet data, and is also used directly in computers for high-speed peripherals such as hard disk drives and video cameras. The 1394b standard was published in the year 2002 and given the formal name IEEE 1394b-2002.
        #

        What kind of bridging work is now underway to enable the use of 1394 in networking applications?

        The 1394.1 standard was published in 2005, and it defines a bus bridge that can connect two (or more) 1394 busses, allowing the use of greater distances and more than 63 nodes, with improved performance due to the isolation of traffic as appropriate between busses. For Internet Protocol (IP) applications, no bridging is required. IEEE 1394 can directly support IPv4 and IPv6 networking, and can optionally be bridged to other IP networks such as Ethernet and WiFi.
        #

        Does the 1394 bus compete with USB, SATA, HDMI or Fiber Channel?

        This depends on your point of view. 1394 has features and capabilities in common with each of these interfaces, but there are also many differences. For example, USB, SATA and Fiber Channel are all computer-type interfaces, used nearly exclusively in a master-slave configuration. In contrast, 1394 is a peer-to-peer interface that works well for computer peripherals, but 1394 is also suitable for an environment with multiple devices that work cooperatively without a central PC for coordination, such as a living-room cluster of audio-video equipment. HDMI is commonly used to deliver a digital signal to a television, but it represents a one-way dead end connection that cannot be used cooperatively like 1394 can. The same video signal, if sent over 1394 instead of HDMI, will consume much less bandwidth, so it is far more practical to record for time-shifting or storage (if copyrights are honored).


      • aloittelija_
        aloittelija_ kirjoitti:

        Aiheeseen liittyen:

        Kysymys ja siihen vastaus:

        Does 1394 have a formal name?

        Yes - the name "FireWire" was trademarked by Apple Computer before the 1394 standard was published. Years later, the name "i.LINK" was trademarked by Sony. Both names are used widely today, and the 1394 Trade Association has been granted rights to license the use of these trademarks at no cost. Qualified products can also use a compliance logo based on these names, when licensed by the 1394 TA.
        #

        Where can I obtain a copy of the specification?

        The 1394-1995, 1394a-2000, and 1394b-2002 specifications are available only from the IEEE, and can be obtained through their web site at http://www.ieee.org.
        #

        What is the status of 1394a, and what does it achieve?

        IEEE 1394a is a supplement to the IEEE 1394-1995 standard, which promotes interoperability and performance while maintaining compatibility with existing products. It also clears up some ambiguities and undocumented features in the 1394-1995 version. IEEE 1394a was published in the year 2000 and given the formal name IEEE 1394a-2000.
        #

        What is 1394b, and when will it be available?

        IEEE 1394b is a significant enhancement to the basic 1394 specification that enables speed increases to 3.2 Gigabits/sec, supports distances of 100 meters on UTP-5, plastic optical fiber and glass optical fiber, and significantly reduces latency times by using arbitration pipelining. It is fully backwards compatible with the 1394-1995 and 1394a-2000 specifications. 1394b provides the speed and distance necessary to implement a home backbone for AV and Internet data, and is also used directly in computers for high-speed peripherals such as hard disk drives and video cameras. The 1394b standard was published in the year 2002 and given the formal name IEEE 1394b-2002.
        #

        What kind of bridging work is now underway to enable the use of 1394 in networking applications?

        The 1394.1 standard was published in 2005, and it defines a bus bridge that can connect two (or more) 1394 busses, allowing the use of greater distances and more than 63 nodes, with improved performance due to the isolation of traffic as appropriate between busses. For Internet Protocol (IP) applications, no bridging is required. IEEE 1394 can directly support IPv4 and IPv6 networking, and can optionally be bridged to other IP networks such as Ethernet and WiFi.
        #

        Does the 1394 bus compete with USB, SATA, HDMI or Fiber Channel?

        This depends on your point of view. 1394 has features and capabilities in common with each of these interfaces, but there are also many differences. For example, USB, SATA and Fiber Channel are all computer-type interfaces, used nearly exclusively in a master-slave configuration. In contrast, 1394 is a peer-to-peer interface that works well for computer peripherals, but 1394 is also suitable for an environment with multiple devices that work cooperatively without a central PC for coordination, such as a living-room cluster of audio-video equipment. HDMI is commonly used to deliver a digital signal to a television, but it represents a one-way dead end connection that cannot be used cooperatively like 1394 can. The same video signal, if sent over 1394 instead of HDMI, will consume much less bandwidth, so it is far more practical to record for time-shifting or storage (if copyrights are honored).

        on tässä edelliseen viestiin!

        #

        Is 1394 a good fit for industrial applications?

        Yes - 1394, especially 1394b, provides numerous benefits suitable for industrial, scientific, and medical applications. The high speed offered by 1394 can provide real time machine control or high-quality video for machine vision and factory automation applications. The long distance offered by 1394b allows many devices in a large factory to be connected, and also allows control equipment (and people) to be located at a safe distance from dangerous equipment or conditions. The optical fiber options in 1394b also provide electrical isolation that can improve safety and reliability, while eliminating electromagnetic emissions that could interfere with equipment or measurements. The Industrial and Instrumentation Working Group within the 1394 TA has developed various specifications to assist with this kind of application.
        #

        What other applications can 1394 be used for?

        1394 is so flexible that it has been widely deployed beyond the computer and consumer electronics markets. As noted above, 1394 cameras and control are used for machine vision, factory automation, and industrial applications. 1394 cables, connectors, and protocols have been specified for automotive use, both for in-vehicle entertainment and for more critical system such as video rear-view mirrors. 1394 has been designed into satellites and advanced military aircraft. 1394 is also used for professional audio and studio applications, where a single 400 megabit cable can carry well over 400 simultaneous channels of CD-quality uncompressed digital audio.
        #

        What about 1394 peripherals?

        Hundreds of models of computer peripherals are available with 1394, including hard disk drives and other storage products, the iPod, web cameras, audio and video breakout boxes, scanners, printers, hubs, and long-haul extenders. Consumer-electronic products such as DV cameras and televisions might not be considered peripherals, but they can also be connected to computers using 1394 to enable many new applications.

        t-jaska


      • Fox
        aloittelija_ kirjoitti:

        on tässä edelliseen viestiin!

        #

        Is 1394 a good fit for industrial applications?

        Yes - 1394, especially 1394b, provides numerous benefits suitable for industrial, scientific, and medical applications. The high speed offered by 1394 can provide real time machine control or high-quality video for machine vision and factory automation applications. The long distance offered by 1394b allows many devices in a large factory to be connected, and also allows control equipment (and people) to be located at a safe distance from dangerous equipment or conditions. The optical fiber options in 1394b also provide electrical isolation that can improve safety and reliability, while eliminating electromagnetic emissions that could interfere with equipment or measurements. The Industrial and Instrumentation Working Group within the 1394 TA has developed various specifications to assist with this kind of application.
        #

        What other applications can 1394 be used for?

        1394 is so flexible that it has been widely deployed beyond the computer and consumer electronics markets. As noted above, 1394 cameras and control are used for machine vision, factory automation, and industrial applications. 1394 cables, connectors, and protocols have been specified for automotive use, both for in-vehicle entertainment and for more critical system such as video rear-view mirrors. 1394 has been designed into satellites and advanced military aircraft. 1394 is also used for professional audio and studio applications, where a single 400 megabit cable can carry well over 400 simultaneous channels of CD-quality uncompressed digital audio.
        #

        What about 1394 peripherals?

        Hundreds of models of computer peripherals are available with 1394, including hard disk drives and other storage products, the iPod, web cameras, audio and video breakout boxes, scanners, printers, hubs, and long-haul extenders. Consumer-electronic products such as DV cameras and televisions might not be considered peripherals, but they can also be connected to computers using 1394 to enable many new applications.

        t-jaska

        ns adapterikaapeleita on saatavana, että firewire800 (IEEE1394b ja firewire400 (IEEE1394a) saadaan kytkettyä yhteen:
        http://www.ramelectronics.net/html/1394B_cables.html

        Liitäntäkortissa voi olla ns. bilingual-kosketin, johon käy vanha sekä uusi kaapeli.
        http://www.zytrax.com/tech/pc/serial.html (sivun alareuna)


    Ketjusta on poistettu 0 sääntöjenvastaista viestiä.

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