Acer SmartRAID V Manual do Utilizador descarregar pdf (Página 203)

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Theory of Operation

Fibre Channel Arbitrated Loop (FC-AL)

Fibre Channel is an industry standard set of protocols for information

transfer using a serial bus. Fibre Channel provides for reliable high-speed

transfer of large amounts of information over long cable lengths.

SmartRAID V Fibre Channel controllers support transfer rates of 1GHz

among up to 126 devices over a maximum of 30 meters (98 feet) of copper

or 10 km (6.2 miles) of optical cable.

DPT Fibre Channel controllers use Arbitrated Loop (FC-AL) topology,

where all devices and the controller are connected in a serial (loop)

fashion. FC-AL provides a cost-effective method of implementing a Fibre

Channel storage subsystem, while maintaining high bandwidth and

reliability characteristics.

Redundancy can be added to a Fibre Channel storage subsystem by using

a dual loop configuration. By forming two arbitrated loops on a dual

channel controller and connecting dual-port devices to both loops, fault

tolerance is provided for cable failure. In normal operation, the controller

will use both loops to communicate with the devices, thus providing an

effective controller bandwidth of 200MB/sec.

DPT SmartRAID V Fibre Channel controllers can have a one or two

HSSDC (copper) connectors. If you want to use a cable length greater than

30 meters, a Media Interface Adapter (MIA) can be used to convert

electrical signals to optical signals for use with fiber optic cable. Optical

cable has complete immunity to electrical noise and the ability to use

significantly longer cable lengths without signal loss.

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Acer SmartRAID V Manual do Utilizador Página 203