M7i Router Rack Requirements
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 23 on page 76.Table 43 on page 75 summarizes rack requirements and
specifications for an M7i router.
Table 43: Rack Requirements and Specifications for an M7i Router
GuidelinesRack Requirement
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 type and mounting bracket hole
spacing
•
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” on page 77.
•
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.
•
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” on page 77.
Rack size and strength
75Copyright © 2019, Juniper Networks, Inc.
Chapter 9: Preparation Overview
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