ATTO ExpressPCI UL4S Betriebsanweisung PDF herunterladen (Seite 12)

ATTO Technology Inc. ExpressPCI Host Adapter Installation and Operation Manual

3.1 Cabling and termination

Cables and devices must be chosen to maximize performance and minimize the electrical noise from the

high-speed data transfers available with the SCSI protocol. Cabling and termination methods become

important considerations.

Exhibit 3.1-1 The following table lists the maximum number of devices you may connect at specific cable distances

using differential and single-ended SCSI in various SCSI environments.

Setting up cables and termination

Use high quality Ultra 320-rated, well-insulated

SCSI cables to ensure error free communications.

Exhibit 3.1-2 Several internal and external cable

connectors.

The ExpressPCI Ultra320 SCSI Host Adapter

supports two types of SCSI signaling: Low

Voltage Differential (LVD) and Single-Ended.

Devices on the same SCSI bus must use the same

signaling, either LVD or Single-Ended.

To set up cabling and termination:

1 Determine whether you are using a single

channel or dual channel host adapter model.

One external connector indicates a single

channel host adapter; two external connectors

indicate a dual channel host adapter.

2 Determine if SCSI devices are going to be

installed internally or externally.

• Total bus cable length varies by host adapter

and type of attached devices. Refer to

Exhibit 3.1-1 for details on maximum cable

length.

• If you combine Wide 16-bit and Narrow 8-

bit devices on the same connector, connect

the Wide devices first (closest to the

connector).

• Refer to the documentation for your SCSI

devices to determine if they are Wide or

Narrow, UltraWIDE SCSI, Ultra2 SCSI,

Ultra160 or Ultra 320.

3 Determine which terminator to use

Bus speed

MB/sec. max.

Bus width

bits

Max. bus lengths, meters

Max. device

support

Single-ended LVD HVD

SCSI-1

586 - 25 8

Fast SCSI

10 8 3 - 25 8

Fast Wide SCSI

20 16 3 - 25 16

Wide Ultra/WIDE SCSI

40 16 - - 25 16

Wide Ultra/WIDE SCSI

40 16 1.5 - - 8

Wide Ultra/WIDE SCSI

40 16 3 - - 4

Ultra2 SCSI

80 16 - 12 - 16

Ultra160 SCSI

160 16 - 12 - 16

Ultra320 SCSI

320 16 - 12 - 16

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 21 22

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