The rear clearance is also necessary for removing and replacing the rear cards and fan trays (see the figure
below). These units are very large and require additional clearance from cable management bars, PDUs,
etc.
Caution
Figure 8: Rear Clearance Zone
Mounting Requirements
Each ASR 5500 chassis occupies 21 RU (rack units) within any standard (EIA-310-D, IEC 60297) 19-inch
(482.6 mm) equipment rack or cabinet using the mounting brackets supplied with the chassis. Extension
brackets (not supplied) may be used in conjunction with the chassis mounting brackets to install the chassis
ASR 5500 Installation Guide
20
Technical Specifications
Mounting Requirements