ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.
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ASHRAE 90445-2009
Scope
OVERVIEW Environmental requirements of datacom equipment may vary depending on the type of equipment and/or manufacturer. However@ there has been agreement among a consortium of manufacturers on a set of four standardized conditions (Classes 1- 4). These conditions are listed in the ASHRAE publication Thermal Guidelines for Data Processing Environments (ASHRAE 2009). An additional classification@ the Network Equipment-Building Systems (NEBS) class@ is typically used in telecommunications environments. Definitions of all classes are provided below: ? Class 1: Typically a datacom facility with tightly controlled environmental parameters (dew point@ temperature@ and relative humidity) and mission critical operations; types of products typically designed for this environment are enterprise servers and storage products. ? Class 2: Typically a datacom space or office or lab environment with some control of environmental parameters (dew point@ temperature@ and relative humidity); types of products typically designed for this environment are small servers@ storage products@ personal computers@ and workstations. ? Class 3: Typically an office@ home@ or transportable environment with little control of environmental parameters (temperature only); types of products typically designed for this environment are personal computers@ workstations@ laptops@ and printers. ? Class 4: Typically a point-of-sale or light industrial or factory environment with weather protection@ sufficient winter heating@ and ventilation; types of products typically designed for this environment are point-of-sale equipment@ ruggedized controllers@ or computers and PDAs. ? NEBS: According to Telcordia GR-63-CORE (Issue 2@ April 2002) and GR- 3028-CORE (Issue 1@ December 2001)@ typically a telecommunications central office with some control of environmental parameters (dew point@ temperature@ and relative humidity): types of products typically designed for this environment are switches@ transport equipment@ and routers. ?Since Class 3 and 4 environments are not designed primarily for the datacom equipment@ they are not covered further in this chapter@ and reference should be made to ASHRAE's Thermal Guidelines book for further information (ASHRAE 2009).
ASHRAE 90445-2009 history
2009ASHRAE 90445-2009 Design Considerations for Datacom Equipment Centers