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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Chapter 2 Preparing for Installation
Site Requirements
Plan so that the rack accommodates your needs. An AC-powered Cisco MGX 8950 switch occupies
35.00 inches (88.9 cm or 20 RUs) of vertical space. A DC-powered Cisco
MGX 8950 switch occupies
29.75 inches (75.69 cm or 17 RUs) of vertical space.
Note In a central office (CO) and private enterprise (PE) environment, the total amount of rack space should
not exceed 42
RUs. If your total configuration exceeds 42 RUs, either replan your configuration or use
more than one rack to house the Cisco MGX 8950 switch components.
You can install the Cisco MGX 8950 in a rack with other Cisco products. If your multisystem rack
includes a Cisco BPX 8600 series switch, install the Cisco BPX switch as the bottom unit.
The location of the Cisco MGX 8950 switch and the layout of your rack or wiring room are extremely
important for proper system operation. If equipment items are too close together, ventilation might be
inadequate, and panels might become inaccessible. As a result, the system might malfunction or even
shut down, and maintenance and repair are made more difficult. A Cisco MGX 8950 switch requires
access space around the cabinet. The suggested clearance at the front and the back of the cabinet is 30
inches (76.20 cm). The suggested clearance on each side of the cabinet is 12
inches (30.48 cm).
Note A vertical gap of 0.047 to 0.077 inches (0.119 to 0.196 cm) or about 1/16 inch must exist between
adjacent modules to allow for module removal.
The location of the switch should accommodate the routing of cables and the termination of telephone
or carrier circuits. We recommend raised flooring so that there is enough space under the flooring for
cables and wiring.
When planning your site layout and equipment locations, keep in mind the precautions that are described
in the
“Safety Requirements” section on page 2-1 and the “Site Requirements” section on page 2-10.
These precautions can help you to avoid equipment failures and can reduce the possibility of
environmentally caused shutdowns. If you are currently experiencing shutdowns or unusually high error
rates with your existing equipment, these precautions might help you isolate the cause of failures and
prevent future problems.
Lower fan tray 1 RU 1.75 in. (4.45 cm) 21.5 in. (54.61 cm)
Air intake plenum 3 RUs 5.25 in. (13.34 cm) 21.5 in. (54.61 cm)
AC power supply tray (optional) 3 RUs 5.25 in. (13.34 cm) 21.5 in. (54.61 cm)
1. RU = rack unit. One RU is equal to 1.75 inches (4.45 cm).
Table 2-2 Rack Space Requirements (continued)
Component Rack Space Height Depth