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Conference ssag::ask_ssag

Title:Ask the Storage Architecture Group
Notice:Check out our web page at http://www-starch.shr.dec.com
Moderator:SSAG::TERZAN
Created:Wed Oct 15 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6756
Total number of notes:25276

6674.0. "termination question?" by VIVIAN::P_MILNER () Fri May 09 1997 09:35

    I want to put a s/works shelf into split bus, the io module is 8 bit, I
    need to put a terminator into the backplane of the shelf.
    
    My question is can I either the BA35X-ME 16 bit active terminator or 
    must I use the BA35X-MB 8 bit terminator with the 8 bit io module.
    The drives are all -VA variant (narrow). Shelf is BA35X-KC 
    
    many thanks for any replies.
    
    /phil 
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6674.1HOUNDD::BASSETTBillMon May 12 1997 15:1714
    Phil,
    
     The preferred method is to use the BA35X-ME.  Since your drives are
    all -VA's the BA35X-MB would work.  However, if you ever add a -VW
    drive to your system, you would then need a -ME.  Do it right from the
    beginning, then you don't have to worry later on....
    
     The difference between the -MB and -ME is that the -ME terminates the
    upper 8 data lines, while the -MB grounds these lines.  [A secondary
    feature of the -ME is the pin that projects through the backplane
    indicated that the -ME is installed (and where).  The -MB does NOT have
    this feature.]
    			OK?
    				Bill
6674.2only one part number now ?VIVIAN::P_MILNERThu May 15 1997 12:266
    many thanks, i suspected what you have confirmed, but it's always nice
    to get a second option if your not 100% sure, I've now ordered the -ME
    
    thanks
    
    phil