M160 Internet Router Hardware Guide
Rack Size and Strength
The router is designed for installation in a rack that complieswith
either of the following standards:
A 19-in. rack as defined in Cabinets,Racks,Panels,andAssociatedEquipment
(document number EIA-310-D)published by the Electronics Industry
Association (http://www.eia.org).
A 600-mm rack as defined in the four-partEquipment Engineeri ng (EE);
European telecommunications standard for equipment practice (documen t
numbers ETS 300 119-1through 119-4) published by the European
TelecommunicationsStandards Institute (http://www.etsi.org).
The horizontal spacing betweenthe rails in a rack that complies with
this standard is usuallyw iderthan the router’s front support posts and
center-mounting brackets,which measure 19 in. (48.3 cm) fromouter edge
toouteredge. Useapprovedwingdevicestonarrowtheopeningbetween
the rails as required.
The rack rails must be spacedwidely enough to accommodate the router chassis’s
external dimensions: 35 in. (89 cm) high, 29 in. (73.6 cm) deep, and 17.5 in.
(44.5 cm) wide. The outer edges of the front support po sts and center-mounting
brackets extendthe width to 19 in. (48.3 cm). The spacing of rails and adjacent
racksmust also allow for the clearances around the router and rackthat are specified
in Clearance Requirementsfor Airflow and Hardware Maintenance on page 62.
NOTE: The router might not fit into an 800-mm-deep cabinet, even if you adjust the
front-to-back positionof the front mounting rails inside the cabinet.
If you mount the router in a cabinet, be surethat ventilation is sufficient to
prevent overheating.
In general, a center-mount rack ispreferable to a front-mount rack because
the more even distributionof weight in the center-mount rack provides
greater stability. If a front-mount rack is used, we recommend supporting
the back of the router with a shelfor other structure.
The chassis height of 35 in. (89 cm) is approximately 20 U. A Uis the
standard rack un it defined in Cabinets, Racks, Panels, and Associated Equipment
(document number EIA-310-D)published by the Electronics Industry
Association. You can stack eight M160 routers in a rack that has at least
40 U (70 in. or 1.78 m) of usable vertical space.
The rack must be strong enough tosupport the weight of the fully configured
router,up to about 370.5 lb (168 kg). If you stack eight routers in one rack,
it must be capable of supportingabout 740 lb (336 kg).
60 Rack Requirements