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Connections Inside a Room
The following is a brief description of the connections.
Each room of an IEEE 1394 interface will go through home electronic devices or through a repeater, or though a set top box in each room. This set top box will conduct transfers with other protocols (including analog). Conventional analog devices can be connected here. User interfaces (such as TV remote controllers) may connect here also. For this user interface, Bluetooth is a promising candidate.
In the early stages of 1394 before the communication infrastructure is completed, this is the limit.
The backbone will be the next step, so someone who wants to connect with the next room over may connect by a line through the gap under the door. This is also possible with 1394b.
Wiring Within the House
From the set top box, the line is connected to the home network terminal. There are 2 types of home network terminals: a passive type optical fiber, and an active type used for routing a few terminals as a relay. This becomes the back bone of the home network, and it connects through the wall to the bridge and server by POF.
The bridge is used for the following objectives.
Because in the IEEE 1394 allows a new device to enter the network at any time, when a new device is recognized the bus is reset. For example, if a video is being recorded in one room, and a stereo system is turned on in another room, the video recording may be interrupted for an instant. Also, because there are 3 types of bandwidths, 100, 200, and 400Mbps, a low speed product will lower the throughput. In order to prevent this from happening, a bridge is set up to separate the house into several blocks, so that each block can operate independently.
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MITSUBISHI RAYON CO., LTD.
Optical Fiber Department
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Phone: +81 3 5495 3060
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