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7-4
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Unpacking
customer-supplied terminal block must be provided. Only power supplies complying with SELV
requirements in EN 60950, UL 1950, IEC950, can be connected to the 48V DC input of the
MGX 8220 system.
• AC Version
For the AC version, an AC power source is required. For power supply redundancy, two such AC
sources, (preferably independent) are required. Each source should be capable of supplying 500W
per shelf. The AC power cables from the AC source attach to the AC power module, which is
mounted below the shelf and cooling assembly.
An AC circuit breaker is recommended for the AC power source that supplies AC power to each
MGX 8220 shelf. This circuit breaker should protect against excess currents, short circuits, and
earth faults in accordance with national and local electrical codes.
The dedicated circuit breaker should be sized so that the rated current and the trip delay is higher
and longer than the MGX 8220 circuit breaker. A 20A, 2-pole AC circuit breaker with a long trip
delay is recommended.
For information purposes, the MGX 8220 shelf uses a 20A, 2-pole AC circuit breaker on each AC
input. The circuit breaker manufacturer is ETA (part number 8340-F120-P1P2-B2H020A).
Cooling
The site must be capable of maintaining a maximum ambient temperature of 40° C while the system is
operating. The recommended temperature range is 20 to 30° C. A fully loaded MGX 8220 switch can
dissipate up to 2400 Btus.
Caution Inadequate ventilation to the system can cause reliability or functionality issues. It is extremely
important that the MGX 8220 switch is installed in a manner that will ensure unrestricted airflow
through the system. Cisco recommends that the switch be mounted in a frame or a cabinet that does
not have front or rear doors that can restrict airflow through the system. If you are going to mount
the MGX 8220 switch in a frame or a cabinet that has front or rear doors, contact Cisco TAC to
determine if the doors can provide adequate ventilation to the system.
Unpacking
The MGX 8220 shelf, the main cooling assembly, the booster cooling assembly, the plenum and spacer,
and the AC power module are shipped in their own separate shipping containers.
To unpack and install the shelf and the cooling assembly, the following tools should be available:
• Utility knife
• Flat blade and Phillips screwdriver sets
• Grounding wrist strap
Warning
If any of the shipping containers are damaged, of if any of the various shipping indicators show
improper handling of the containers, contact your local shipping representative.