Cisco ASR 903 Installation Guide

During vertical installation of the router, ensure that the equipment is mounted only on concrete or other
non-combustible surfaces.
Note
Step 3 Install the 8 or 12 (4 or 6 per side) 12-24 x 3/4-inch or 10-32 x 3/4-inch screws through the holes in the bracket and into
the threaded holes in the equipment rack posts.
Step 4 Use a tape measure and level to verify that the chassis is installed straight and level.
Installing Plenum A903-F2B-AIR-U Assembly and Chassis in the Rack
Following steps help you to install the plenum assembly irrespective of the chassis and rack size.
The 19-inches bracket is an integral part of the plenum base. Ensure to select the 21-inches or 23-inches
adapter for your plenum based on your rack size.
Note
Figure 55: Different Adapters
Step 1 Position the air baffle and the side plate to the plenum. Secure the air baffle and the side plate using a maximum torque
of 11.5 in.-lb (1.3 N-m). See figure below.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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Installing the Cisco ASR 903 Router
Installing Plenum A903-F2B-AIR-U Assembly and Chassis in the Rack

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English