Alcatel-Lucent 7705 Manual page 4

2. Heat Exchange (HEX) cabinets use a sealed cabinet and a heat exchanger to withdraw
heat from the cabinet interior without bringing outside air into the cabinet. This results in
no contamination influx and low humidity within the cabinet.
3. Air Conditioned (AC) cabinets use a mechanical or Thermal Electric Cooling (TEC)
refrigeration unit to handle higher levels of heat in high-power installations. AC
implementation is similar to HEX since the cabinet should be sealed. Proper AC
implementation should never allow unfiltered air into the cabinet interior.
Site Influences
Is backup power generation located in the same area as the communications equipment? Are
batteries located in the same area as the equipment?
Backup generators that are located in the same enclosed area as the communications
equipment may cause a great deal of site pollution, such as nitrous oxides and hydrogen
sulphides, which can be detrimental to the long-term reliability and performance of
equipment. A best practice is to house motor generator sets in a separate enclosure from the
communications equipment. Batteries will outgas during charge and discharge cycles. These
gases are very corrosive and may also be explosive in sufficient concentration. Batteries
should always be housed in a properly vented enclosure or compartment, separate from the
communications equipment.
Is the equipment located above the water grade? Is there adequate water drainage and leak
controls?
Many areas are prone to flooding during rainy season or spring thaws, and it is important for
the site to be located above typically anticipated flood levels, or to have sump pumps to keep
the installation site dry. Drainage with backflow preventers should be installed if the site has
provision for water sources, such as cooling towers.
What protection is there to prevent entry of insects, pests, and vermin?
Pests and vermin such as insects, mice, and spiders prefer warm, sheltered areas. All entries
into the enclosure or shelter should be appropriately sealed and regularly maintained.
Site Assessment Checklists
The following site assessment checklists are intended to act as a tool in assessing the potential
risks that must be managed at an installation site. The checklists are not intended to provide
an exhaustive list of all risk factors, but rather to indicate some of the most common risks.
The first two checklists indicate environmental factors that may result in malfunctioning or
failing equipment if the installation site is not appropriately deployed and maintained to
counteract the detrimental effects of the environment. For each risk factor that is present, you
must consider how to best design the installation site to avoid the negative effects of the risk
factor. For the final checklist, any question that is answered in the negative indicates that
measures must be taken to correct the installation site appropriately to reduce the risk of
equipment damage.
Seasonal Influences
Is the installation site in an area with the potential to experience any of these seasonal
influences?
Checklist 1: Seasonal Influences
Influence
Hurricanes
Cyclones
Tidal or river flooding
Recent volcanic activity
Forest fires
Local Risk Factors
Is the local surrounding environment of the installation site in proximity to possible sources of
contaminants or other risk factors that may cause or accelerate corrosion?
Checklist 2: Local Risk Factors
Risk Factor
Landfills
Fertilizer manufacturing
Farming
Sewage
Geothermal activity
Swamps or marshes
Oceans
Ancient seabeds
Power generation
Automotive and diesel combustion
Fossil fuel processing
Cement plants
Construction sites
Steel blast furnaces
Steel electric furnaces
Coke plants
Pulp and paper manufacturing
Chlorine plants
Rubber manufacturing
Paint manufacturing
Aluminum manufacturing
Ore smelting
Checklist 2: Local Risk Factors (Continued)
Risk Factor
Tobacco smoke
Battery manufacturing
Yes No
Mountains near a coastline
High humidity regions
Fossil fuel use, such as open fires used by locals for cooking or burning
farming byproducts
Specific Characteristics of the Installation Site
Does the installation site exhibit characteristics that may require upgrade or repair?
Checklist 3: Specific Characteristics of the Installation Site
Characteristic
Is the installation site in a room that is part of the building HVAC system?
Does the installation site have protection to prevent ingress of dust?
Yes No
Does the installation site have protection to prevent ingress of pollution?
Does the installation site have protection to prevent ingress of humidity?
If outside air is brought in for ventilation, does it pass through a filter?
If outside air is brought in for ventilation through a filter, is the type and
rating of the filter appropriate to the environmental conditions?
Does the site have an air conditioner?
Is the rating and capacity adequate for the space?
Is there proper drainage of water from the air conditioner?
Does the site have a dehumidifier?
Is the rating and capacity adequate for the space?
Is there proper drainage of water from the dehumidifier?
Is backup power generation located in a separate area from the
communications equipment?
Are batteries located in a separate area from the communications
equipment?
Is the equipment located above the water grade?
Are there adequate water drainage and leak controls?
Is there protection present to prevent entry of insects, pests, and vermin?
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Yes No
Yes No