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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
Enclosed racks must have adequate ventilation. Ensure that the rack is not overly congested, because
each unit generates heat. An enclosed rack should have louvered sides and a fan to provide cooling air.
The enclosure must also provide adequate cooling through the use of an appropriately sized heat
exchanger or air conditioner, which dissipates the heat generated by existing remote terminal system
components and by the installed switch.
Power Requirements
The system can accept power from either an optional AC source (AC power supply tray) or a DC source
(DC PEM). Table 3-5 details the power specifications for both the AC and DC sources.
Warning
This unit is intended for installation in restricted access areas. A restricted access area is where
access can only be gained by service personnel through the use of a special tool, lock and key, or
other means of security, and is controlled by the authority responsible for the location.
Statement 37
Note In the United States, restricted access is defined in Articles 10-116, 10-117, and 10-118 of the National
Electrical Code ANSI/NFPA 70.
Table 3-5 Power Specifications for the MGX 8850 or MGX 8850/B Switch
Specification Description
Power input voltage
• AC source: Requires 220 VAC. Normal operating range is 200 to 240
VAC, 47 to 63 Hz. The maximum voltage range is 180 to 254 VAC.
Note The AC power source must be within 6 feet (1.8 meters) of the
system and easily accessible.
• DC source: –42 to –56 VDC.
AC system current
requirements
Configuration-dependent: Use Table 3-6 for exact requirements. For
general planning purposes: 14.4 A at a nominal voltage of 200 VAC. At the
minimum voltage limit of 180 VAC, the current draw is a maximum of 16
A.
DC system current
requirements
Configuration-dependent: Use Table 3-6 for exact requirements. For
general planning purposes: 50 A at nominal –48 VDC; 57.1 A at –42 VDC
maximum.
Input AC power
connector
IEC 320-type C19 (20 A North American, 16 A International) input
connector. For a list of the AC power plugs for domestic and international
use, see the Table 3-7 on page 3-26.
DC input connections Three-position terminal block for 6 AWG wire (10 square millimeters), no.
10 screw lugs designed for 6 AWG wire and Panduit (part number LC
AS6-10-L). The customer-supplied wire must be terminated with a
terminal lug that accepts no. 10-32 screws.