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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter3 Preparing for Installation
Site Requirements for a MGX 8830 or MGX 8830/B Switch
The MGX 8830 or MGX 8830/B switch and component s fit in either a 19-inch (48.26 cm) wide rack or
a 23-inch (58.42 cm) wide rack (with extenders installed). Se e Table 3 -17 for component space
requirements within the rack.
Plan so that the rack accommodates your needs. An AC-powered MGX 8830 or MGX 8830/B switch
occupies 14.00 inches (35.56 cm or 8 RUs) of vertical space. A DC -powered MGX 8830 or MGX
8830/B switch occupies 12.25 inches (31.12 cm or 7 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 configurati on or use
more than one rack to house the switch components.
The location of the Cisco MGX 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 resul t, the system might malfunction or even
shut down, and maintenance and repair are made more difficult.
A Cisco MGX switch requires access space around the cabinet. The suggested clearance at the fr ont and
the back of the cabinet is 30inches (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 inch (0.119 to 0.196 cm) or about 1/16 inch must exist between adjacent
modules to allow for module removal.
Position the switch so that it does not interfere with the routing of cables and the termination of
telephone or carrier circuits. Raised flooring is reco mmended 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 de scribed
in the “Safety Requirements” section on page3-2 and the “Site Requirements for a MGX 8830 or MGX
8830/B Switch” section on page3-41. 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 yo u
isolate the cause of failures and prevent future problems.
Table3-17 MGX 8830 or MGX 8830/B Rack Space Requirements
Component Rack Space Height Depth
MGX 8830 or MGX 8830/B
switch
7 RUs 12.25 in. (31.12 cm) 23.5 in. (59.69 cm)
AC power supply tray (optional) 1 RU 1.75 in. (4.45 cm) 23.5 in. (59.69 cm)