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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Chapter 2 Preparing for Installation
Site Requirements
Power
The system can accept power from either an optional AC source (AC power supply tray) or a DC source
(DC PEM).
Table 2-4 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.
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.
The following sections provide additional information about power:
• AC Power, page 2-17
• DC Power, page 2-18
• Power Consumption Calculation Tables, page 2-19
AC Power
AC power is supplied to the Cisco MGX 8950 switch through the AC power supply tray. AC power
sources must be dedicated AC branch circuits. Each branch circuit must be protected by a dedicated
two-pole circuit breaker. The circuit breakers at the source must have a rated trip delay time greater than
Ta b l e 2-4 Power Specifications
Specification Description
Power input voltage • AC source
1
: Normal operating range is 200–240 VAC, 47 to 63
Hz. The maximum voltage range is 180–254 VAC.
• DC source: –42 to –56 VDC.
1. The AC power source must be within 6 feet (1.8 meters) of the system and easily accessible.
AC system current
requirements
Configuration-dependent: Use Table 2-5 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 21 A.
DC system current
requirements
Configuration-dependent: Use Table 2-5 for exact requirements. For
general planning purposes: 76 A (37.5 A per feed) at nominal
-48
VDC; 86 A (43 A per feed) at -42 VDC minimum.
Input AC power
connector
For a list of the AC power plugs for domestic and international use,
see the
“AC Power” section on page 2-17.
DC input connections Three-position terminal block for 6 AWG wire (10 square mm) and
no. 10 screw lugs designed for 6 AWG wire. Note that the customer’s
wire must be terminated with a terminal lug that accepts no. 10-32
screws.