M320 Cabinet Size And Clearance Requirements; Table 15: Cabinet Clearance Requirements - Juniper M320 Hardware Manual

M320 Router Hardware Guide

M320 Cabinet Size and Clearance Requirements

46
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The minimum size enclosed cabinet that can accommodate the router is 600 mm wide
and 800 mm deep. A cabinet larger than the minimum requirement provides better
airflow and reduces the chance of overheating. To accommodate a single router, the
cabinet must be at least 20 U (35 in. or 88.9 cm) high. If you provide adequate cooling
air and airflow clearance, you can stack two routers in a cabinet that has at least 40 U
(70 in. or 1.78 m) of usable vertical space.
The minimum front and rear clearance requirements depend on the mounting
configuration you choose. The minimum total clearance inside the cabinet is 30.70 in.
between the inside of the front door and the inside of the rear door. If you choose a
front-mount installation, you must maintain clearance of 4.80 in. (122 mm) between the
front-mounting flanges and the inside of the cabinet front door, and 25.90 in. (658 mm)
between the front-mounting flanges and the inside of the cabinet rear door. If you choose
an adjustable-mount installation using the mounting brackets, the clearance requirements
depend on where you install the mounting brackets.
Table 15 on page 46 provides the clearance requirements for each of the 11 mounting
bracket positions on the side of the chassis (position 1 represents the mounting brackets
installed closest to the front of the chassis; position 11 represents the mounting brackets
installed closest to the rear of the chassis). The front clearance is measured between
the front of the front rack rail and the inside of the cabinet front door. The rear clearance
is measured between the front of the front rack rail and the inside of the cabinet rear
door.

Table 15: Cabinet Clearance Requirements

Mounting
Bracket
Position Front Clearance
1 7.04 in. (179 mm)
2 8.02 in. (204 mm)
3 9.01 in. (229 mm)
4 9.99 in. (254 mm)
5 10.98 in. (279 mm)
6 11.96 in. (304 mm)
7 12.94 in. (329 mm)
8 13.93 in. (354 mm)
9 14.91 in. (379 mm)
10 15.90 in. (404 mm)
Rear Clearance
23.66 in. (601 mm)
22.68 in. (576 mm)
21.69 in. (551 mm)
20.71 in. (526 mm)
19.73 in. (501 mm)
18.74 in. (476 mm)
17.76 in. (451 mm)
16.77 in. (426 mm)
15.79 in. (401 mm)
14.81 in. (376 mm)
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