Installation Manual

16 Site Preparation
Cabinet Placement
The cabinet must meet the following criteria:
• Minimum cabinet size and airflow are according to the EIA standard.
• Minimum of 5 inches (12.7 cm) between the side intake and exhaust vents and the cabinet wall.
Rack Mounting
When you prepare your equipment rack, ensure that the rack is earth ground. The equipment rack must be
grounded to the same ground point used by the power service in your area. The ground path must be
permanent.
Fans and Airflow
Ventilation is side-to-side, with five fans (four fans in the S25N) on the left side of the switch that operate
at a constant speed. For proper ventilation, position the system in an equipment rack (or cabinet) with a
minimum of five inches (12.7 cm) of clearance around the side intake and exhaust vents. When two
S-Series systems are installed side by side, position the two systems at least 5 inches (12.7 cm) apart to
permit proper airflow. The acceptable ambient temperature ranges are listed in Environmental Parameters
on page 41.
As listed in Table 3, “Status Panel LED Display,” on page 13, the front panel of the system has an Alarm
status LED, which is green when the switch is operating within required temperature parameters and all
components are operating normally, including fans. The LED is amber when the temperature or
components are outside expected parameters, red in a major alarm.
FTOS turns on major and minor alarms and logs temperature warnings at the following temperatures (in
degrees Celsius), and logs another message when the temperature returns to normal. The Command Line
Interface (CLI) also reports an alarm. The fan speed changes accordingly.
Use the
show logging command to see the log messages. For details, see the logging chapters of the
Command Reference and Configuration Guide. In a stack, each unit has its own temperature monitoring
and control. Status logging is identified by unit in the system log.
Fan replacement in the field is not offered as an option.
Table 4 Major and Minor Temperature (Degrees Celsius) Warnings
S25N S25V
Major On 62 60
Major Off 58 56
Minor On 60 58
Minor Off 50 47