Rack type

Use a two-post rack or a four-post rack. You can mount the switch on any two-post or four-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in. or 4.45 cm) increments and that meets the size and strength requirements to support the weight.

A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry Association.

The rack must meet the strength requirements to support the weight of the chassis.

Rack size and strength

• Ensure that the rack complies with one of these standards:
  • A 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry Association.
  • A 600-mm rack as defined in the four-part Equipment Engineering (EE); European telecommunications standard for equipment practice (document numbers ETS 300 119-1 through 119-4) published by the European Telecommunications Standards Institute (http://www.etsi.org).

    The horizontal spacing between the rails in a rack that complies with this standard is usually wider than the QFX3100 Director device’s mounting brackets, which measure 19 in. (48.2 cm) from outer edge to outer edge. Use approved wing devices to narrow the opening between the rails as required.

• Ensure that the rack is one of the following standard lengths:
  • 23.62 in. (600 mm)
  • 30 in. (762 mm)
  • 21.5 in. (546 mm)
• Ensure that the rack rails are spaced widely enough to accommodate the QFX3100 Director device chassis' external dimensions. The outer edges of the front-mounting brackets extend the width of the chassis to 19 in. (48.2 cm).
• The rack must be strong enough to support the weight of the QFX3100 Director device.
• Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the QFX3100 Director device and rack.