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1394a / FireWire 400 / iLink Cables Specifications & Selection

1394a / FireWire 400 / iLink Cables Specifications & Selection

FireWire 400:
In spite of a maximum rate of 400 Mbps for FireWire (S400) and up to 480 Mbps for USB 2.0, USB is trailing behind. Why? The performance disparity hinges on FireWire&squot;s application, which offers more robust data transfer overall compared to USB. USB can only accomodate one external device per PC port, which is why high end PCs have as many as eight USB ports. While it is possible to use a USB hub in order for devices to share USB ports, the performance of this alternative varies widely. Things are different with FireWire, with all the devices being connected in series forming a logical chain (peer to peer) and where the protocol also permits physical branchings. Thanks to this method, it is possible to span longer stretches. However, if an interconnected device needs to be removed, then it is necessary to interrupt the connection for all the devices that follow in the chain. There is, however, one aspect that FireWire cannot change, either - namely that the existing bandwidth must always be shared by all the devices. more...

FireWire 800:
The FireWire advantage can be summed up in three words: speed, speed and more speed - at 800Mbps, it has more than two times the usable bandwidth of USB 2.0, which makes it the perfect choice for high-speed storage and serious video capture. The extra speed of FireWire 800 over USB 2.0 makes FireWire much more suitable for bandwidth-intensive applications like video and graphics, which often consume hundreds or even thousands of megabytes of data per file. For instance, single hour of DV-format video consumes about 13 thousand megabytes (13 GB). Other benefits include:

  • Highly efficient architecture. IEEE 1394b reduces delays in arbitration, while 8B10B encoding reduces signal distortion and increases throughput. (See technology brief for details.)
  • Better user experience. No matter how you connect devices together, FireWire 800 just works. In fact, you can even loop your FireWire 800 chain back to your Mac for redundancy while performing live.
  • Backwards compatibility . Manufacturers have adopted FireWire for a broad range of devices, such as DV cameras, hard drives, digital still cameras, professional audio, printers, scanners and home entertainment. Adapter cables for the FireWire 800 9-pin connector let you use these FireWire 400 products on the FireWire 800 port. more...
FireWire 3200:
FireWire is an energy efficient, peer-to-peer, non-polling, continuous data communication protocol allowing for up to 97% of transmitted data to be a user-defined data payload, and not communications protocol overhead. FireWire 800 products today deliver 90 MB/s of sustainable throughput. With the anticipated 3% overhead, FireWire 3200 could deliver nearly 390 MB/s of usable data bandwidth, though a straight-forward 400% increase would be 360 MB/s. That is enough to drive full 1920 x 1200 HDTV signals at up to 50 fps. FireWire hard drives can move data on FireWire 800 nearly three times as fast as with USB 2.0. With FireWire 3200, the advantages eSATA has today will be made moot. FireWire also capable of providing much more electrical power for remote device operation than USB. As a result, FireWire 3200 will be capable of not only communicating with a hard drive at eSATA speeds, but it will also be able to completely power it remotely at those speeds. Current cable solutions, including long distance cables used for 100+ meter communications, will be used with the new protocol. With full backward compatibility, the internal hardware components will be the only required upgrade parts necessary for system maker adoption. Provided an equal sized unit can be created, it will literally be drop-in upgradeable. As such, FireWire 3200 products should be available very soon after final ratification. more...

More Specifications:
  • Six wire 4 signal transfer rates to 800Mbps Certified for 1394 a to 400 Mbps.
  • 30-micron gold plated contacts on 2mm centers
  • Durability Connections: beyond 1500 cycles, P & P
  • Signal Attenuation: <5.8 dB at 400MHz
  • Signal Velocity of Propagation: < 5.05 nanosec/m.
  • Signal pairs of propagation skew: < 400 p/s
  • Crosstalk: < -26 dB
  • Cable assemblies in standard lengths: 1 meter, 2 meters, 3 meters and 4.5 meters. Custom lengths from 0.2 meters (6 inches).
  • 6 wire = 4 signal (plus ground & power)
  • 4 wire = 4 signal (dual twisted pair)
  • All Newnex FireWireStuff Cables are compliant with the IEEE 1394-1995-a standards (400 Mbps) and exceed IEEE 1394-b (800 Mbps) specifications.
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