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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 the MGX 8850 or MGX 8850/B Switch
Figure3-3 MGX 8850 or MGX 8850/B Switch Components
The MGX 8850 or MGX 8850/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 -3 for component space
requirements within the rack.
Plan so that the rack accommodates your needs. An AC-powered MGX 8850 or MGX 8850/B switch
occupies 35.00 inches (88.9 cm or 20 RUs) of vertical space. A DC-powered MGX 8850 or MGX 8850/B
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 ra ck 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 MGX 8850 or MGX 8850/B switch components.
17670
2 RU
1 RU
10 RU
1 RU
3 RU
3 RU
Exhaust plenum
3.5 in.
Upper fan tray
1.75 in.
Lower fan tray 1.75 in.
Switch
17.5 in.
Air intake plenum
5.25 in.
Optional AC
power tray 5.25 in.
Status LEDs
AC
DC
1200W
AC
DC
1200W
AC
DC
1200W
AC
DC
1200W
Table3-3 MGX 8850 or MGX 8850/B Rack Space Requirements
Component Rack Space Height Depth
Exhaust plenum 2 RUs 3.50 in. (8.89 cm) 21.5 in. (54.61 cm)
Upper fan tray 1 RU 1.75 in. (4.45 cm) 21.5 in. (54.61 cm)
Cisco MGX 8850 switch 10 RUs 17.5 in. (44.45 cm) 21.5 in. (54.61 cm)
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)