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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 8850 or MGX 8850/B Switch
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 result, 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 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 8850 or
MGX 8850/B Switch” section on page 3-10. 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.
Temperature, Altitude, and Humidity
The system can tolerate a wide range of temperatures. Table 3-4 provides the Cisco recommendations
for temperature, altitude, and humidity conditions in a CO and PE environment.
An AC-powered MGX 8850 or MGX 8850/B switch dissipates up to 9560 Btus (2.8 kW) per hour, and
a DC-powered MGX 8850 or MGX 8850/B switch dissipates up to 8200 Btus (2.4 kW) per hour.
Warning
To prevent the system from overheating, do not operate it in an area that exceeds the maximum
recommended ambient temperature of 104°F (40°C).
Statement 1047
Note Electrical equipment generates heat. Ambient air temperature might not be able to cool equipment to
acceptable operating temperatures without adequate circulation. Ensure that the room in which you
operate your system has adequate air circulation.
Table 3-4 CO and PE Operating Environment Requirements
Environmental
Specification Description
Temperature 32 to 104ºF (0 to 40ºC)—Normal operation
68 to 86ºF (20 to 30ºC)—Recommended operation
1
1. The switch can run up to 122ºF (50ºC) for up to 72 hours.
Altitude –197 to 13124 feet (–60 to 4000 meters)
Humidity Up to 85% (noncondensing)