Rack type and mounting bracket hole spacing

Use a four-post rack or a two-post rack. You can mount the router on any four-post or two-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75-in./4.44-cm) increments and that meets the size and strength requirements specified in this table.

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 (http://www.eia.org).

Rack size and strength

• Ensure that the rack is a 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association (http://www.eia.org).
• Ensure that the rack is one of the following standard lengths:
  • 23.62 in. (600 mm)
  • 30.0 in. (762 mm)
  • 31.5 in. (800 mm)
• The rack rails must be spaced widely enough to accommodate the router chassis's external dimensions: 3.5 in. (8.9 cm) high, 21.75 in. (55.2 cm) deep, and 17.4 in. (44.2 cm) wide. The outer edges of the mounting brackets extend the width to 19.2 in. (48.7 cm). The spacing of rails and adjacent racks must also allow for the clearances around the router and rack that are specified in MX80 Router Clearance Requirements for Airflow and Hardware Maintenance.
• The MX80 router ships with the mounting brackets installed in the front-mount position. You can also move the brackets to the center-mount position. For instructions about moving the mounting hardware, see Moving the Mounting Brackets for Center-Mounting the MX80 Router.
• The chassis height of 3.5 in. (8.9 cm) is approximately 2 U. 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. You can stack several routers in a cabinet that has sufficient usable vertical space. Each router requires 2 U.
• The rack must be strong enough to support the weight of the fully configured router, up to 30 lb (13.6 kg).
• Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the router and rack as specified in MX80 Router Clearance Requirements for Airflow and Hardware Maintenance.

Rack connection to the building structure

• Secure the rack to the building structure.
• If earthquakes are a possibility in your geographical area, secure the rack to the floor.
• Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum stability.