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Rack Requirement
s
• 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 horizonta
l spacing between the rails in a rack that complies with this standard
are usually wider than the router’s moun ting ears, which measure 19 in. (48.3 cm)
from outer edge to outer edge. Use approved wing devices to narrow the opening
between the r
ails as required.
The rack rails must be spaced widely enough to accommodate the router chassis’s external
dimensions:
5.25 in. (13.3 cm) high, 24 in. (61 cm) deep, and 17.5 in. (44.5 cm) wide. The
outer edges of the mounting ears extend the width to 19 in. (48.3 cm). The spacing of rails
and adjacent racks must also allow for the clearances a round the router and rack that are
specified i
n “Clearance Requirements for Airflow and Hardware Maintenance” on page 40.
The router
might not fit into an 800-mm-deep cabinet, even if you adjust the
front-to-back p osition of the front mounting rails inside the cabinet.
If you mount the router in a cabinet, be sure that ventilation is sufficient to
prevent overheating.
In general, a center-mount rack is preferable to a front-mount rack, because the more even
distribu
tion of 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 shelf or other structure.
The chass
is height of 5.25 in. (13.3 cm) equals 3 U, the standard rack unit defined in
Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published
by the Electronics Industry Association. Youcanstack14M5andM10routersinarackthat
has at le
ast 42 U (73.5 in. or 1.87 m) of usable vertical space.
The rack must be strong enou gh to support the weight of the fully configured router, up to
about 61
lb (27.6 kg) for the M5 router or 67 lb (29.5 kg) for the M10 router. If you s tack 14
routers in one rack, it must be capable of supporting about 940 lb (427 kg).
38 M5 and M10 Internet Routers Hardware Guide