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Mitsubishi Rayon Home Network Proposal Background
<Background of the Proposal>
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Mitsubishi Rayon first proposed the IEEE1394 home network using POF in the fall of 1995.
In may of that year, the first POF to exceed 100Mbps/50m, the EskaMEGA
was presented.
Simultaneously a proposal was made at the ATM forum with NEC and Sony, to make this fiber the standard for ATM LAN(proposed in April, 1995, adopted in May 1997). Back then, discussions on residential broadband for household networks by using ATM were popular in the ATM Forum, and a proposal to use this fiber for 52Mbps/50m was presented at that time. Therefore, the first proposal made was for home networks using ATM.
Also at this point, discussions on IEEE 1394 were also popular, because IEEE1394 can be connected both to home electronic devices and to PCs, and should be possible to use in a home network.
But, as you know, the maximum for the almost decided IEEE1394-1995 was only 4.5m. It was then thought that using the same EskaMEGA as for ATM at 50m would make it possible.
In the autumn of 1995, Sony and Mitsubishi Rayon who were participating in the ATM Forum, started to review the possibilities to make this happen.
At the time called a "Home Bus System", it was thought that a 200Mbps bandwidth would be adequate for TV, video, audio, phone and PC use. (The diagram to the right is the first Home Network diagram made in 1995.)
And with the 200Mbps/50m specification, in April 1997 a proposal was made with NEC and Sony to IEEE1394 to make this the standard interface.
(In the same period, proposals were initiated towards automobile manufacturers for an IEEE1394/POF automobile network)
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<Changes in the Proposal>
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But even from then, it was becoming clear that 200Mbps would be inadequate. It became necessary to develop a fiber that would provide 400Mbps, separate from the standardization.
In August 1997, Mitsubishi Rayon promised the development of an S400 fiber at the IEEE1394.b meeting. This is the EskaMiu presented in June 1999.
Mitsubishi Rayon already had the 1Gbps/50m POF called EskaGIGA, presented in 1995. However this was a GI type fiber, which was much more expensive than the SI, and was not easy to work with or install as the SI type. Because it raises working time and connector costs, it became necessary to develop a new fiber that shares the same workability as the EsKaMEGA SI type, having compatible connectors.
The multistep structure of the EskaMiu uses the same basic principles of the SI, but the effect is similar to the GI. Therefore, it mixes the best of both, having bandwidth on a similar level while retaining workability, compatibility with the SI, and low cost.
However, this time it was developed as a home network product, so the bandwidth was held at 500MHz.
The current home network system diagram, counting the above figure as the 1stgeneration, is now on the 26thgeneration system. In this time, the POF home network has been discussed by many people involved in EIAJ and postal department related groups.
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MITSUBISHI RAYON CO., LTD.
Optical Fiber Department
6-41, Konan 1-chome, Minato-ku, Tokyo 108-8506, JAPAN
Phone: +81 3 5495 3060
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