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SCSI Fiber Optic Extender

Figure 4-1. Alternate Configuration Linking Two SCSI Buses.

In this configuration, the primary SCSI bus is used to connect the local

high-speed peripherals. The secondary SCSI bus is used exclusively as the

extended SCSI bus.

Fiberoptic Cable

Primary

SCSI Bus

Terminators

Terminator

Secondary

SCSI Bus

Terminator

Summary of Contents for ACI-2000A

Page 1: ...t Call 412 746 5500 or Fax 1 800 321 0746 To order Call 412 746 5500 8 00 A M to 8 00 P M EST Mail order Black Box Corporation P O Box 12800 Pittsburgh PA 15241 Bl ack Box Corporati on The Source for...

Page 2: ...ce in which case the user at his own expense will be required to take whatever measures may be required to correct the interference Changes or modifications not expressly approved by the party respons...

Page 3: ...ximum SCSI Cable Length 19 7 ft 6 m Maximum Speed 10 megabytes per second Slew Rate 5 ns maximum Protocol Sync or async Standards ANSI X3 131 and X3T9 2 Interface Compatible with SCSI I and SCSI II SC...

Page 4: ...m SCSI data rate of 10 MBytes per second in asynchronous or synchronous mode It supports the Fast SCSI standard available in top of the line computers and peripherals And proprietary switching enables...

Page 5: ...e with ST connectors provides the interface between the local and remote Extender units And for greater application flexibility the Extender supports 110 or 220 VAC operation via a user selectable swi...

Page 6: ...ED provides a visual indication of the SCSI interface BUSY signal It is a general indication that devices are communicating via the SCSI bus LINK ERROR Lights when the integrity of the fiberoptic link...

Page 7: ...n including The nature and duration of the problem When the problem occurs The components involved in the problem Any particular application that when used appears to create the problem or make it wor...

Page 8: ...n any device that generates heat NOTE Switch off power to all computers and peripherals attached to the SCSI bus before installing the SCSI Fiber Optic Extender 3 1 Setting the AC Line Voltage Switch...

Page 9: ...der them separately 3 3 Internal External Terminator Options The SCSI Fiber Optic Extender features internal active SCSI bus termination to improve the cable matching characteristics between multiple...

Page 10: ...s so make sure that a maximum of two terminators are installed on each side of the Extender link see Figures 2 1 and 2 2 Connect the twisted pair cable from the host or SCSI peripheral to the 50 pin S...

Page 11: ...to keep the fiberoptic connectors and optical components free of dust and dirt And whenever cables are not atttached to the Extender s ST ports cover them with the protective plastic caps included wit...

Page 12: ...ber A faint red light will be visible at the tip of one of the connectors This indicates the transmit fiber This is the connector that should be attached to the receive RCV port of the remote Extender...

Page 13: ...synchronous and synchronous SCSI devices on the bus Overall system performance will depend on the individual data rate and protocol of each SCSI device plus the overhead of the host computer In genera...

Page 14: ...ing Two SCSI Buses In this configuration the primary SCSI bus is used to connect the local high speed peripherals The secondary SCSI bus is used exclusively as the extended SCSI bus Fiberoptic Cable P...

Page 15: ...TION and RESELECTION phases MSG MESSAGE A signal driven by a target during the MESSAGE phase REQ REQUEST A signal driven by a target to indicate a request for a REQ ACK data transfer handshake ACK ACK...

Page 16: ...OUND 13 7 DB 7 16 33 GROUND 15 8 DB P 18 34 GROUND 17 9 GROUND 20 35 GROUND 19 10 GROUND 22 36 GROUND 21 11 GROUND 24 37 GROUND 23 12 TERMPWR 26 38 OPEN 25 13 GROUND 28 39 GROUND 27 14 GROUND 30 40 GR...

Page 17: ...ack Box Corporati on The Source for Connectivity P O B o x1 2 8 0 0 P i t t s b u r g h P A1 5 2 4 1 4 1 2 7 4 6 5 5 0 0 F a x 4 1 2 7 4 6 0 7 4 6 Copyright 1996 Black Box Corporation All rights reser...