Internal Termination on Sun Ultra 2

2007-12-25 9:21:00

Q1: What provides termination inside the box? Is it on the motherboard

or is

one of the internal devices responsible?

A: A rough question. The simple answer is that it depends on the

controller.

Q2: The internal CD-ROM drive has the termination jumper closed

(enabled);

this seems strange since it is in the middle of a cable (it's on a cable

that goes from a connector on the motherboard to a connector on the

CD-ROM

back to a connector on the motherboard). Why would a device that's not

the end of cable be terminated? If this IS the correct place for a

terminator, what's terminating the high byte (the CD-ROM uses a 50-pin,

narrow SCSI connector)?

A: Presumably, the converter does the "right" thing.

Also, some of these drives uses the terminator by a jumper, so you might

see a terminator that's not being used because the jumper prevents it

from being used.

Q3: Are there any documents anywhere (on the web, preferably) that

describe

internal SCSI cabling and termination?

General answers:

Can't answer your question but -- have you tried looking at docs.sun.com

or www.sunhelp.com?

-------------------

Though I don't think that they are, bear in mind that differential

UltraSCSI

requires no termination (just a really short cable length).

Thanks to:

Stephanie Lam

Sam Vilain

Roger Fujii

--
Chad Campbell
Software Engineer, Innovision Corporation
Chad.Campbell@innovision.com
(913)226-8700

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