Standard environments are listed earlier in this manual - see the Standard Environments paragraph.

Information below provides detailed information about some environments and explains how they are interpreted by specific reliability prediction methods.

BRITISH TELECOM HRD4

GB Ground, Benign: Nearly zero environmental stress with optimum conditions for operation and maintenance. Typical applications are in main exchange buildings, environmentally controlled remote exchanges or cabinets (including Case Repeater Equipment) and environmentally controlled subscribers’ premises. The equipment is operated in a protected environment, free from significant shock and vibration with the temperature of the air immediately surrounding the component not exceeding 55°C and relative humidity rarely exceeding 70% at 15°C.

GF Ground, Fixed: Conditions less than ideal, with some environmental stress and limited maintenance. Typical applications are manholes, remote terminals and areas in subscribed premises subject to shock and vibration or temperature and atmospheric variations.

GM Ground, Mobile: Conditions more severe than for Ground, fixed, mostly for shock and vibration. There is less maintenance attention and equipment is susceptible to operator abuse. Typical applications are mobile telephones, portable operating equipment and test equipment.

Bellcore Issue 5

GB Ground, Fixed: Nearly zero environmental stress with optimum engineering operation and maintenance. Typical applications are central office, environmentally controlled vaults, environmentally controlled remote shelters, and environmentally controlled customer premise areas.

GF Ground, Fixed: Some environmental stress with limited maintenance. Typical applications are manholes, poles, remote terminals, customer premise areas subject to shock, vibration, temperature, or atmospheric variations.

GM Ground, Mobile: Conditions more severe than GF, mostly for shock and vibration. More maintenance limited and susceptible to operator abuse. Typical applications are mobile telephones, portable operating equipment, and test equipment.

Bellcore Issue 6, Telcordia Issue 1

GB Ground, Fixed: Nearly zero environmental stress with optimum engineering operation and maintenance. Typical applications are central office, environmentally controlled vaults, environmentally controlled remote shelters, and environmentally controlled customer premise areas.

GF Ground, Fixed: Some environmental stress with limited maintenance. Typical applications are manholes, poles, remote terminals, customer premise areas subject to shock, vibration, temperature, or atmospheric variations.

GM Ground, Mobile: Conditions more severe than GF, mostly for shock and vibration. More maintenance limited and susceptible to operator abuse. Typical applications are portable and mobile telephones, portable operating equipment and test equipment.

AIC Airborne, commercial: Conditions more severe than GF, mostly for pressure, temperature, shock and vibration. In addition, the application is more maintenance limited than for GF. Typical applications are in the passenger compartment of commercial aircraft.

SF Spacebased, commercial: Low earth orbit. Conditions as for AIC, but with no maintenance. Typical applications are commercial communication satellites.

GJB299

GB Normally weather, almost no mechanical stress, and readily accessible to maintenance, such as laboratory with temperature and humidity controlled or large ground station.

GMS Typical conditions in ground silo in which. missiles and its assistant equipment are set.

GF (GF1) Typical conditions in the inside of generic building or on permanent racks with good ventilation. With moderate strike and vibration. Such as environment in which permanent installation radar, communications facilities, TV and recorder etc. are installed.

NUU (GF2) Ground conditions with poor protected facilities for weather and Underground conditions. Severe conditions related to high temperature, low temperature, difference in temperature, severe humidity, mildew, salt vapor and chemic gas, etc.

GM (GM1) Equipment installed on vehicles which moved smoothly. With strike and vibration conditions, such as special vehicle running on highroad, carriage of train.

ARW (GM2) Equipment installed on tracked vehicles. With violent strike and vibration conditions related to violently moving. and with restricted control of ventilation, temperature and humidity.

MP Equipment manually transported in field environment. With poor maintenance conditions.

NSB Typical conditions in submarines.

NS (GS1) Include sheltered or below deck conditions on surface ship which travel smoothly. Unserious exposed to salt vapor and water vapor. Such as air-conditioning cabin of large cargo ship traveling near coastal waters and ship traveling in freshwater.

NH (GS2) Sheltered conditions without exposed to weather conditions, but often with violent strike and vibration. Include sheltered or below deck conditions on surface ship.

NU Typical conditions in board of ship. Unprotected surface ship borne, often with violent strike and vibration, exposed to weather conditions and immersed in salt water.

AIF Typical conditions in fighter which can be occupied by pilots. Without high temperature, high pressure, and violent strike and vibration.

AUF Severe conditions of high temperature, high pressure, and violent strike and vibration, etc., such as equipment compartment and bomb bay in fuselage, tail, wing of fighter.

AIC Typical conditions in cargo compartments which can be occupied by an aircrew.

AUC Environmentally uncontrolled areas which cannot be inhabited by an aircrew during flight.

SF Earth orbital. Approaches benign ground conditions. Vehicle neither under powered flight nor in atmospheric reentry, such as installing environment of electronic equipment in satellites.

ML Severe conditions related to missile launch, solid rocket motor propulsion powered flight, space vehicle boost into orbit, and vehicle re-entry and landing by parachute, such as noise, vibration, strike, and other severe conditions.