Juniper Networks E-Series - Manual (Page 52)

CHAPTER 3
Installation Guidelines and Requirements 3-6
Mechanical Requirements
Follow these mechanical requirements for your rack:
• Select from the following rack options:
> Two-post rack – a freestanding enclosed cabinet with two
mounting posts in the front
> Telco-type rack – two adjacent mounting posts that you must
secure to the floor or an overhead structure
> Four-post rack – a freestanding open rack, either open or closed
• The rack must have at least two mounting posts.
• The distance between the mounting holes in the two posts must be
18.31 inches ±.063 inch, as specified in the EIA-310-D.
• Do not use an enclosed rack for ERX-7xx models or the ERX-310
router. It does not provide adequate ventilation.
• A fully loaded rack with three ERX-14xx models must structurally
support 300 pounds (136 kilograms).
• Optional mounting kits are available for 19-inch and 23-inch rack
mounting (mid- and front-chassis mounting). Contact your Juniper
Networks sales representative for more information.
Space Requirements
If you use an enclosed rack for an ERX-14xx model, ensure that there is a
minimum of 3 inches of clearance between the inner side wall and the
router. This clearance space will allow adequate air flow.
Proper Rack Installation
To confirm proper equipment rack installation, check the following:
• Racks are installed and electrically grounded according to
manufacturer instructions.
• Equipment racks are anchored to the floor and, when possible,
anchored to the ceiling as well.
• Equipment rack installations comply with applicable local, state, and
national codes.
Warning: To maintain airflow requirements, a plenum must be installed above
ERX-14xx models before any other piece of equipment is installed above the
router.