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    How is the rackmount U-space of a NetShelter cabinet or rack identified?

    Issue: 
    Customers need to correctly identify a 'U-space' or 'rack space.'

    Product Line: 
    NetShelter SX

    Environment:
    All versions and serial ranges.

    Cause: 
    Incorrect placement of equipment can create airflow problems, like hot air recirculation.

    Resolution: see below


    As set forth by the EIA/ECA-310-E Standard:

    1. For any Rackmount device or enclosure - a U or unit of rack space is equivalent to 1.75 inches or 44.45 mm.

    2. The mounting hole pattern on a rack or enclosure must follow the following guideline:
     
    • Vertical Hole spacing must follow a pattern of 5/8""-5/8""-1/2"" or 15.9mm-15.9mm-12.7mm
    • Horizontal Hole spacing must be 18.3"" or 465 mm (+/- 1.6 mm)
    • Clearance between inner edges of mounting rails must be 450 mm at minimum
    • Outside edges of mounting rail must be 483.4 mm apart at minimum

    EIA/ECA-310-E rail specifications in attached file.

    To properly mount a device in the rack, a user needs to utilize the notched square mounting hole to indicate the center of a U space. For Example, to mount a 1 U device, 3 mounting holes would be covered by the device with the notched hole residing in the center of the group of 3. Mounting in an "off-U position", effectively moving the installed device 1 hole space up or down is incorrect and will lead to airflow and cooling issues.
     

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