Juniper TX MATRIX Hardware Manual page 94

TX Matrix Hardware Guide
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The rack rails must be spaced widely enough to accommodate the TX Matrix chassis's
external dimensions: 44.5 in. (113.0 cm) high, 31.4 in. (79.8 cm) deep, and 17.4 in. (44.2 cm)
wide. The outer edges of the mounting brackets extend the width to 19 in. (48.3 cm). The
spacing of rails and adjacent racks must also allow for the clearances around the TX Matrix
router and rack that are specified in "TX Matrix Clearance Requirements for Airflow and
Hardware Maintenance" on page 63.
In an open-frame rack, center-mounting is preferable to front-mounting because the
more even distribution of weight provides greater stability. If center-mounting is used,
you use the mounting brackets attached to the center of the chassis for rack mounting;
if front-mounting is used, you use the front-mounting flanges.
Before you mount the TX Matrix router in a four-post rack or cabinet, you must install the
spacer bars on the rack. For instructions aboutinstalling the mounting hardware, see
"Installing the TX Matrix Mounting Hardware for a Four-Post Rack or Cabinet" on page 75.
The chassis height of 44.5 in. (113.0 cm) is approximately 25.4 U. A
unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number
EIA-310-D) published by the Electronics Industry Association. You can stack one TX Matrix
router in a rack that has at least 25.4 U (44.5 in. or 113 cm) of usable vertical space.
The rack must be strong enough to support the weight of the fully configured TX Matrix
router, up to about 495 lb (225 kg).
U is the standard rack
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