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)

    With the use of adaptors, the router can fit into a rack that is 600 mm wide and 600 mm deep 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). Use approved wing devices to narrow the opening between the rails as required.

  • 30.0 in. (762 mm)
  • 21.5 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, 18 in. (45.7 cm) deep, and 17.5 in. (44.5 cm) wide. The outer edges of the mounting brackets extend the width to 19 in. (48.2 cm). The spacing of rails and adjacent racks must also allow for the clearances around the router and rack that are specified in M7i Router Clearance Requirements for Airflow and Hardware Maintenance.
• 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 21 M7i routers in a rack that has at least 42 U (73.5 in. or 1.87 m) of usable vertical space.
• The rack must be strong enough to support the weight of the fully configured router, up to 36.5 lb (16.6 kg). If you stack multiple fully configured routers in one rack, it must be capable of supporting the combined weight of the routers.
• Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the switch and rack as specified in M7i 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.

Caution: If you are front-mounting the chassis, we recommend supporting the back of the router with a shelf or other structure.