Cisco Systems WAVE594K9 Manual De Usuario

Temperature extremes can cause a variety of problems, including premature aging and failure of chips 
or mechanical failure of appliances. Extreme temperature fluctuations can cause chips to become loose 
in their sockets and can cause expansion and contraction of disk drive platters, resulting in read or write 
data errors. 

To minimize the negative effects of the temperature on system performance, follow these guidelines:

Ensure that the system is operated in an environment that does not exceed 0 to 40ºC (32 to 104ºF) 
in either direction. The upper end of operating temperature above applies up to an altitude of 1,000 
meters (3,281 feet) and then subtract 3ºC for each additional 1,000 meters up to a maximum 
operational altitude of 3,000 meters (9,843 feet).

Ensure that the system has adequate ventilation. Do not place it within a closed-in wall unit or on 
top of cloth, which can act as insulation. Do not place it where it will receive direct sunlight, 
particularly in the afternoon. Do not place it next to a heat source of any kind, including heating 
vents during winter.

Adequate ventilation is particularly important at high altitudes. System performance may not be 
optimum when the system is operating at high temperatures as well as high altitudes.

Make sure that all slots and openings on the system remain unobstructed, 
especially the fan vent on the back of the system.

Clean the system at regular intervals to avoid any buildup of dust and debris, which can cause a 
system to overheat.

If the system has been exposed to abnormally cold temperatures, allow a 2-hour warm-up period to 
bring it up to a normal operating temperature before turning it on. Failure to do so may cause damage 
to internal components, particularly the hard disk drives.

If intermittent system failures are noticed, try reseating any socketed chips, which might have 
become loose because of temperature fluctuations.

High-humidity conditions can cause moisture migration and penetration into the system. This moisture 
can cause corrosion of internal components and degradation of properties such as electrical resistance 
and thermal conductivity. Extreme moisture buildup inside the system can result in electrical shorts, 
which can cause serious damage to the system.

Each system is rated to operate at 10 to 90 percent non-condensing relative humidity. Buildings in which 
climate is controlled by air conditioning in the warmer months and by heat during the colder months 
usually maintain an acceptable level of humidity for system equipment. However, if a system is located 
in an unusually humid location, a dehumidifier can be used to maintain the humidity within an 
acceptable range.

Operating a system at high altitude (low pressure) reduces the efficiency of forced and convection 
cooling and can result in electrical problems related to arcing and corona effects. This condition can also 
cause sealed components with internal pressure, such as electrolytic capacitors, to fail or perform at 
reduced efficiency.