SCSI

Bus

Termination

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The

Model

140

and Model 240 have a

fast/wide SCSI-2 bus which can support

 

internal

and

external

SCSI

devices. However, each

controller

on these

SCSI

busses

 

must have a unique SCSI id, and the

SCSI busses must be properly terminated both

internally

and

externally (if

external

devices

are used) to ensure SCSI

signal

integrity.

For

directions

on

setting

the

SCSI

id

on

each

device, consult

the

documentation

for

that

device,

as

wellAdapters,as the Devices,

and

Cable

Information for

Multiple

Bus

 

Systems .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

140

Internal

SCSI

Bus

Termination

 

 

 

 

 

 

 

 

 

 

 

 

The

Model

140

internal

SCSI

chain

must

be terminated by the last drive in the chain,

which

must

be

configured as a self-terminating

drive

by

setting jumpers

on the

drive.

Please

consult

the

documentation that

came

with

your

SCSI

device.

 

 

 

Note: Only the last drive in each SCSI chain should be configured as self-terminating.

External SCSI chains must be terminated by a separate SCSI terminator.

Power Cables

To avoid electrical shock, a power cable with a grounded attachment plug is provided. Use only properly grounded outlets.

Power cables used in the United States and Canada are listed by Underwriter's Laboratories (UL) and certified by the Canadian Standards Association (CSA).

These power cords consist of:

Ÿ Electrical cables, Type SVT or SJT.

ŸAttachment plugs complying with National Electrical Manufacturers Association (NEMA) 5-15P. That is:

"For

115 V

operation,

use a UL listed cable

set consisting

of

a

minimum

18

AWG,

Type SVT or SJT three-conductor cord

a maximum of 15 feet in

length

and

a parallel

blade,

grounding type

attachment

plug

rated at 15 A, 125 V."

 

 

 

 

 

 

"For

230

V

operation

in the

United

States use a UL listed

cable

set

consisting of a

minimum 18 AWG, Type SVT or SJT

three-conductor

cable

a maximum

of

15

feet

in

 

length, and

a tandem

blade,

grounding

type attachment

plug rated

at

15

A,

250

V."

ŸAppliance couplers complying with International Electrotechnical Commission (IEC) Standard 320, Sheet C13.

1-187043 43P Series Service Guide

Page 34
Image 34
IBM SA38-0512-03 manual 140, Power Cables, Bus