[SI-LIST] Re: AC/DC impedance spec for floppy and 40Pin-IDEcable s.

John,

Original 40 pin IDE is not an impedance controlled cable, so I don't think
that you will find a characteristic impedance specification for it.
However, the Ultra ATA cables (80 conductor, 40 pin connector) are impedance
controlled to, I believe, around 75 ohms.  They use a GSG configuration and
a ground bar in the connector in order to achieve the desired impedance.

James R. Jones
Dell

-----Original Message-----
From: John@xxxxxxxxxxxx [mailto:John@xxxxxxxxxxxx]
Sent: Saturday, September 14, 2002 12:45 AM
To: 'SI-List'
Cc: John Lin (???)
Subject: [SI-LIST] AC/DC impedance spec for floppy and 40Pin-IDE cables.


Dear all SI gurus,
 
Are there any AC/DC impedance spec for floppy cable and 40pin-IDE cable?
ATAPI-6 spec. doesn't mention ac impedance for 40pin-IDE but 80pin-IDE
cable. Can somebody tell the reason?
 
 
Regards,

John Lin

Quanta Computer Inc.,Taiwan, R.O.C.
Email: John@xxxxxxxxxxxx
Tel: 886+3+3272345 ext. 5183



 


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