5. Interfacing Requirements. Black Box IC501A

IC500A 7/12/00 12:38 PM Page 17

CHAPTER 5: Interfacing Requirements

5. Interfacing Requirements

5.1 SCSI Cable Interface Requirements

The SCSI Fiber Optic Bus Extender can be installed at any point on the SCSI bus.

The Extender provides an optically isolated SCSI bus over extended distances.

Terminators must be installed on both the local and extended bus. Make sure that

a maximum of two terminators are installed on each bus.

The Extender has a 50-pin and a 68-pin connector for narrow and wide SCSI devices, respectively.

5.1.1 S INGLE -E NDED SCSI F IBER O PTIC B US E XTENDER

The IC500A supports a maximum cable length of 19.7 feet (6 meters) at standard

SCSI data rates (5 Mbps, narrow), or 9 feet (2.7 meters) at “Fast” SCSI data rates

(10 Mbps).

5.1.2 D

IFFERENTIAL

SCSI F

IBER

O

PTIC

B

US

E

XTENDER

The IC501A supports a maximum cable length of 82 feet (25 meters) at standard or “Fast” SCSI data rates.

NOTE

Do not connect devices to both the Wide and Narrow connectors at the same time. This will cause termination and noise problems in your system.

Do not intermix single-ended and differential devices on any one side of the SCSI chain unless a SCSI differential converter is used to convert from one bus type to the other.

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