Sun external SMD cables

[jim stephens]

On 2/14/2020 6:09 AM, Alan Perry via cctalk wrote:
>
>> On Feb 14, 2020, at 04:15, Liam Proven via cctalk <cctalk at classiccmp.org> wrote:
>>
>> On Thu, 13 Feb 2020 at 19:06, Alan Perry via cctalk
>> <cctalk at classiccmp.org> wrote:
>>> I supplied part numbers. How can I be more specific?
>> Oddly, some of us do not have a mental look-up table of Sun part
>> numbers. In fact I think I can safely say that I could not identify a
>> single cable of any form for any machine ever made by its part number.
>> If you can, good for you.
> I read the label attached to the cable.
>
> I could tell you what connectors are at each end of the cable, but I couldn’t tell you how they are wired together and, having no docs on the cable or an example to check, am dependent on the part number to tell me that.
>
> alan
The SCSI spec and cabling have a specific way that the conductors have 
to be rolled to make a round cable.  Each cable type has a recommended 
way that signal and grounds should be paired and in what proximity in 
the cable.

For SMD I never saw a formal spec with as much detail as the SCSI spec, 
and I don't know if they standardized the cabling.  Mainly to speculate 
about whether you can use a generic 25-25 or 37-37 straight thru.

I suspect the 25-25 would be sensitive to the type of conductor pairing 
and fabrication would work.  The 37-37 bus connector probably would work 
with looser electrical specs to substitute in different cabling.

Also just to make things more entertaining on the Oracle site for sun 
hardware they are using the term "Storage Module Drive" to refer to 6g/s 
SAS drives installed in individual blades for a blade server system.   
So the term appears frequently in their online docs, and including old 
documents and current documents.

Here's one example of that term on a page 
https://docs.oracle.com/cd/E19452-01/html/821-0911/gkfcf.html

If I'm not far off base, I ran across two vendors who may have made the 
controller if they aren't sun, Interphase, and Xylogics.  Also an 
article referred to the Sun boards as Eurocard from Xylogics. Xylogics 753.
Thanks
Jim
>> But if someone, say, told me "I need some SCSI cables: a MD50 to MD68
>> cable, 2 × MD68 to MD68, an MD50 terminator and ideally a DB25 to
>> MD50," then I would be able to say "yes, I have some of those".
>>
>> However, since Jim has been a bit more forthcoming, it sounds like I
>> can't help you.
>>
>> -- 
>> Liam Proven - Profile: https://about.me/liamproven
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>