U320 Cable Lengths

Bill Ham bill_ham at ix.netcom.com
Sun Aug 24 18:16:18 PDT 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* Bill Ham <bill_ham at ix.netcom.com>
*

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Hi, 

You should realize that these lengths mentioned in SPI-5 are attainable
with worst case drivers and receivers only if the requirements in PIP
for the cable plant are met (as well as those for the driver and
receiver).  So the answers to your questions may provide existence
proofs for some actual drivers and receivers (or may not) but not give
you a robust answer that can be taken into products without a lot of
work.  If you have not looked at PIP it may be worthwhile. 


PIP is on the T10 web site. 


Cheers, Bill 
HP 


Kevin D Butt wrote: 


  
I have a question about real-world cable lengths in use in Ultra 320
environments.  SPI-5 lists the cable lengths at 25 m for point-to-point
and 12,5 m for multi-drop. 
Is there anybody out there who is actually using 25 m cables in point to
point without any issues? 
Is there anybody out there using 12,5 m cables with mulitple devices
attached without any issues? 
How many devices have successfully been used on one cable? 

Thanks, 


Kevin D. Butt 
Fibre Channel & SCSI Architect, IBM Tape Microcode, 
6TYA, 9000 S. Rita Rd., Tucson, AZ  85744 
Tie-line 321; Office: 520-799-5280, Lab: 799-5751, Fax: 799-4138, Email:
kdbutt at us.ibm.com



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 Hi, You should realize that these lengths mentioned in SPI-5 are attainable with worst case drivers and receivers only if the requirements in PIP for the cable plant are met (as well as those for the driver and receiver).  So the answers to your questions may provide existence proofs for some actual drivers and receivers (or may not) but not give you a robust answer that can be taken into products without a lot of work.  If you have not looked at PIP it may be worthwhile. PIP is on the T10 web site. Cheers, Bill 
HP Kevin D Butt wrote:   
I have a question about real-world cable lengths in use in Ultra 320 environments.  SPI-5 lists the cable lengths at 25 m for point-to-point and 12,5 m for multi-drop. 
Is there anybody out there who is actually using 25 m cables in point to point without any issues? 
Is there anybody out there using 12,5 m cables with mulitple devices attached without any issues? 
How many devices have successfully been used on one cable? Thanks, Kevin D. Butt 
Fibre Channel & SCSI Architect, IBM Tape Microcode, 
6TYA, 9000 S. Rita Rd., Tucson, AZ  85744 
Tie-line 321; Office: 520-799-5280, Lab: 799-5751, Fax: 799-4138, Email: kdbutt at us.ibm.com 

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