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== Environmental conditions ==
According to [[iconectiv|Telcordia]] GR-49
# Normal conditions: This refers to a normal environment that is expected in most areas of any service provider. Temperatures are expected to be in the range of {{convert|-20|to|32|°C}}, and humidity is expected to be less than 90% RH. No unusual contamination is expected.
# Severe climatic conditions: These cover environments more severe than those of a normal environment (i.e., higher humidity, high lightning activity, exposure to salt-laden atmosphere, and exposure to contaminants). Temperatures are expected to be in the range of {{convert|-40|to|43|°C}}, and humidity may exceed 90% RH. Jacks installed in NIDs in such environments are known to become contaminated and develop low insulation resistances and low dielectric breakdown voltages when subjected to high humidity. These problems can cause noisy lines or even service outages.
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