The router can be installed in many types of racks, including
four-post (telco) racks and open-frame racks. An example of an open-frame
rack appears in Figure 1.Table 1 summarizes
rack requirements and specifications for an M7i router.
Table 1: Rack Requirements
and Specifications for an M7i Router
Rack Requirement
Guidelines
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 Components Industry
Association (http://www.ecianow.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 Components Industry
Association (http://www.ecianow.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 Components 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.
