Juniper Networks ERX Hardware 8 - Manual (Page 151)

Installation Guidelines and Requirements
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Equipment Rack Requirements
When allocating equipment rack space, consider the following:
Type of equipment racks recommended for ERX routers
Number of equipment racks required to hold your current router configuration
Future expansion
Make sure your distribution rack meet basic mechanical and space requirements
and complies with conventional standards. In the United States, use EIA-310-D
Cabinets, Racks, Panels, and Associated Equipment, September 1992.
Equipment Rack Requirements 133