🚀 go-pugleaf

Paul Womar <Newsmaster@pwomar.demon.co.uk> wrote:

> Rebecca and Rowland <real-address-in-sig@flurbletigibbet.rhubarb.foobar>
> wrote:
> 
> > Hang on - that can't be right.  Termination resistors don't need any
> > power at all.  They connect from the signal lines to a 0V line.
> 
> SCSI2 specification 5.4.1:
> 
> All signals not defined as RESERVED, GROUND, or TERMPWR shall be
> terminated at both ends of the cable.  The implementor may choose one of
> the following two methods to terminate each end (see figures 9 and 10):
> 
>    a)     The termination of each signal shall consist of 220 ohms
> (+/-5%) to
>           the TERMPWR line and 330 ohms (+/-5%) to ground.  Using
> resistors
>           with +/-1% tolerance improves noise margins.
[snip rest of spec]
> The first termination method above is the same as in SCSI-1.  The second
> termination method is recommended for better signal quality.

Well, there you go.  Rowland's completely wrong again.  Thanks - I must
say I'm surprised at this.  I suppose I'd better find out *why* it's
done this way now.

Rowland.

-- 
Remove the animal for my email address:   rebecca@astrid.dog.u-net.com
Sorry - the spam got to me.          
PGP pub key A680B89D; fingerprint: F5605EAE F56F2C0B 818F3319 5227767F
                                   What?  Don't ask me - I don't know.