Rack and Cabinet Requirements

Use a rack with bracket holes or hole patterns spaced at 1 U increments (1.75 in. or 4.45 cm). Ensure that the rack meets the size and strength requirements to support the weight.

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

The front rack opening between the flanges must be 450 mm wide + 2 mm (17.75 in. + 0.08 in.).

• Ensure that the rack complies with the standards for a 19 in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association.

• Use  mm racks 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 compliant with this standard is usually wider than the device's mounting brackets. The mounting brackets measure 19 in. (48.26 cm) from outer edge to outer edge. Use approved wing devices to narrow the opening between the rails as required.

• Ensure that the rack rails are spaced widely enough to accommodate the external dimensions of the device chassis. The outer edges of the front-mounting brackets extend the width to 19 in. (48.26 cm).

• Ensure that for four-post installations, the front and rear rack rails are spaced between 23.6 in. (60 cm) and 36 in. (91.4 cm) front-to-back.

• Ensure that the rack is strong enough to support the weight of the device. A fully-configured weighs about .

• Ensure that the spacing of rails and adjacent racks allows for proper clearance around the device and rack.

• Secure the rack to the building structure.

• If earthquakes occur in your geographical area, secure the rack to the floor.

• Secure the rack to the ceiling brackets and to wall or floor brackets for maximum stability.

Cabinet depth

The minimum cabinet depth for accommodating the device is 19.5 in. (49.5 cm). Large cabinets improve airflow and reduce the chance of overheating.

Cabinet clearance

The outer edges of the front mounting brackets extend the width of the chassis to 19 in. (48.2 cm).

The minimum total clearance inside the cabinet is 30.7 in. (78 cm) between the inside of the front door and the inside of the rear door.

Cabinet airflow requirements

When you mount the device in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating.

• Ensure that the cool air supply you provide through the cabinet adequately dissipates the thermal output of the router (or routers).

• Ensure that the cabinet allows the chassis hot exhaust air to exit the cabinet without recirculating into the router. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top allows the best airflow through the chassis. If the cabinet contains a top or doors, perforations in these elements assist with removing the hot exhaust air.

• The device pulls air through the front of the chassis towards the fan tray and exhausts it out of the chassis. Install the device in the cabinet in a way that maximizes the open space on the rear side of the chassis. This position maximizes the clearance for critical airflow.

• Route and secure all cables to minimize the blockage of airflow to and from the chassis.

• Ensure that the spacing of rails and adjacent cabinets allows for proper clearance around the router and cabinet.