Introduction |
IOI-141LS SCSI Bus expander allows extension of device connectivity and/or
cable length limits of the SCSI bus. SCSI bus expanders are the way servers
are clustered. A SCSI bus expander couples bus segments together without
any impact to the SCSI protocol, software, or firmware. The IOI-141LS SCSI
bus expander attaches Single-Ended (SE) SCSI peripherals to the Low Voltage
Differential(LVD signaling bus used by Ultra2 SCSI.
The IOI-141LS enables system architects to take advantage of the inherent cable distance, device connectivity, and signaling while operation with peripherals designed for Ultra SCSI speeds. The IOI-141LS provides additional control capability through the pin level electrical isolation mode. This feature allows logical disconnection of both the A side bus and B side bus without disrupting SCSI transfers currently in progress. For example, devices on the logically disconnected B side can swapped out while the A side bus remains active. The IOI-141LS is based upon bus expander technology resulting in some signal filtering and retiming in some signal filtering and retiming to maintain signal skew budgets. In addition, the IOI-141LS has no programmable registers, therefore it does not require any software. The IOI-141LS operates in two mode:
LVDLink Technology TolerANT Technology TolerANT receiver technology improves data integrity in unreliable cabling environments, where other devices would be subject to data corruption. TolerANT receivers filter the SCSI bus signals to eliminate unwanted transitions, without the long signal delay associated with RC-type input filters. This improved driver and receiver technology helps eliminate double clocking of data, the single biggest reliability issue with SCSI operations. The benefits of TolerANT include increased immunity to noise on the de-asserting signal edge, better performance due to balanced duty cycles, and improved SCSI devices prevent glitches on the SCSI bus at power-up or power-down, so other devices on the bus are also protected from data corruption. |
Product Profile |
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