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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
Chapter 3 Preparing for Installation
Site Requirements for the MGX 8880 Media Gateway
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 MGX 8880 Media Gateway components.
The location of the MGX media gateway 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 MGX media gateway 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 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 recommended 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 3-2 and the “Site Requirements for the MGX 8880 Media
Gateway” section on page 3-55. 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.
Table 3-25 MGX 8880 (17 RU) Rack Space Requirements (with Optional AC Power Tray)
Component Rack Space Height Depth
Exhaust plenum with fan tray 2 RUs 3.50 in. (8.89 cm) 21.5 in. (54.61 cm)
MGX 8880 Media Gateway 10 RUs 17.5 in. (44.45 cm) 21.5 in. (54.61 cm)
Air intake plenum with DC power
supply
2 RUs 3.50 in. (8.89 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)