Cisco DS-C9148S48PK9, Руководство по установке оборудования

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Cisco MDS 9148S Multilayer Switch Hardware Installation Guide
OL-20185-01
Chapter 2 Installing the Cisco MDS 9148S Switch
Preinstallation
•
Ensure there is adequate space around the switch to allow for servicing the switch and for adequate
airflow (airflow requirements are listed in
Appendix 1, “Technical Specifications” ).
•
Ensure the air-conditioning meets the heat dissipation requirements listed in Appendix 1, “Technical
Specifications.”
•
Ensure the cabinet or rack meets the requirements listed in Appendix 1, “Cabinet and Rack
Installation.”
Note
If the front cabinet mounting rails are not offset from the front door or bezel panel by a minimum
of 3 inch (7.6 cm), and a minimum of 5 inch. (12.7 cm) if cable management brackets are
installed on the front of the chassis, the chassis should be mounted rear-facing to ensure the
minimum bend radius for fiber-optic cables. See the
“Installing the Switch in a Cabinet with
Insufficient Front Clearance” section on page 2-21 .
Note
Jumper power cords are available for use in a cabinet. For more information, see the “Jumper
Power Cord” section on page 1-6 .
•
Ensure the chassis is adequately grounded. If the switch is not mounted in a grounded rack, we
recommend connecting both the system ground on the chassis and the power supply ground to an
earth ground.
•
Ensure the site power meets the power requirements listed in Appendix 1, “Technical
Specifications.” If available, you can use an uninterrupted power supply (UPS) to protect against
power failures.
Caution
Avoid UPS types that use ferro-resonant technology. These UPS types can become unstable
with systems such as the Cisco MDS 9000 Family, which can have substantial current draw
fluctuations because of fluctuating data traffic patterns.
•
Ensure that circuits are sized according to local and national codes.
For North America, the 300-W power supplies require a 20-A circuit. If you are using a 200- or
240-VAC power source in North America, the circuit must be protected by a two-pole circuit
breaker.
Caution
To prevent loss of input power, ensure the total maximum loads on the circuits supplying
power to the switch are within current ratings for wiring and breakers.
•
As you install and configure the switch, record the information listed in the “Site Planning and
Maintenance Records” section on page 1-1 .
•
Use the following screw torques when installing the switch:
–
Captive screws: 4 in-lb
–
M3 screws: 4 in-lb
–
M4 screws: 12 in-lb
–
10-32 screws: 20 in-lb
–
12-24 screws: 30 in-lb