SIST HD 478.2.4 S1:2003
(Main)Classification of environmental conditions -- Part 2: Environmental conditions appearing in nature -- Solar radiation and temperature
Classification of environmental conditions -- Part 2: Environmental conditions appearing in nature -- Solar radiation and temperature
Defines limiting severities of solar radiation to which products are liable to be exposed during transportation, storage and use.
Klassifizierung von Umweltbedingungen -- Teil 2: Natüliche Einflüsse -- Sonnenstrahlung
Classification des conditions d'environnement -- Partie 2: Conditions d'environnement présentes dans la nature -- Rayonnement solaire et température
Définit les sévérités limites du rayonnement solaire auquel les produits sont susceptibles d'être exposés pendant le transport, le stockage et la mise en oeuvre.
Classification of environmental conditions - Part 2: Environmental conditions appearing in nature - Solar radiation and temperature
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Standards Content (Sample)
SLOVENSKI SIST HD 478.2.4 S1:2003
STANDARD
julij 2003
Classification of environmental conditions - Part 2: Environmental conditions
appearing in nature - Solar radiation and temperature
ICS 19.040 Referenčna številka
SIST
...
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The present document contains requirements for:
- the output performance of the direct current (dc) power equipment at the interface "A";
- the input of the telecommunications equipment connected to interface "A" powered by dc.
The dc voltage at interface "A" may be derived from the AC primary supply. The dc supply may incorporate a backup battery. If any other equipment e.g. datacom equipment, are connected to interface "A" in parallel to telecommunications equipment, all requirements addressed in clause 4 of the present document must be fulfilled. The present document aims at providing compatibility between the power supply equipment and the power consuming telecommunications equipment, and also between different system blocks connected to the same power supply.
NOTE 1: The present document is applicable only to -48 V dc power supply interfaces. However, during a transitional period, other dc voltages may be used in existing installations. Annex A gives guidance on working in conjunction with existing -60 V dc supply systems.
The power supply interface, interface "A", is a physical point to which all the requirements are related (see figure 1).
This point is situated between the power supply system(s) and the power consuming telecommunications equipment.
NOTE 2: Interface "A" is located at the power terminals of the telecommunications equipment. Subject to the installation preconditions this point may be located at any other point between the power supply system and the telecommunications equipment by mutual agreement of the relevant parties.
The requirements at interface "A" apply to:
- the output of the power supply equipment or power supply installation of telecommunications centres;
- the power supply input of telecommunications equipment installed at telecommunication centres;
- telecommunications equipment, installed in customers' premises, whose dc interface "A" is also used by equipment requiring a supply to this specification.
NOTE 3: Normally there is more than one load unit connected to interface "A". In these cases, interface "A" will undergo further restrictions with respect to noise limits or other disturbances specified in clause 4.8.
NOTE 4: Disturbances on the power supply interface "A" relating to the continuous wave phenomena below 20 kHz are covered within the present document.
NOTE 5: An example of a configuration in which interface "A" is identified is given in annex D.
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The present document applies in telecommunication centres and similar installations to the bonding network of the building, the bonding network of the equipment, and the interconnection between these two networks. It contributes to the standardization of telecommunication and datacom equipment installation.
It also co-ordinates with the pre-conditions of the installation to achieve the following targets:
- safety from electrical hazards;
- reliable signal reference;
- satisfactory Electromagnetic Compatibility (EMC) performance.
A defined bonding configuration down to the equipment level shall facilitate the installation, operation and maintenance of telecommunication centres in telecommunication buildings or similar installations independent of the equipment supplier. The specification of telecommunication and datacom equipment and of the pre-conditions of installation are subject to agreement of the parties (e.g. the supplier and the purchaser). Annex A can be used in the procedure to achieve agreement.
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- subscriber line terminal equipment.
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The present document contains requirements for:
• the output performance of the power equipment at the interface A3;
• the input of the telecommunications equipment connected to interface A3.
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• the output of the power supply equipment or power supply installation of telecommunications centres;
• the power supply input of telecommunications equipment and the datacom equipment installed at telecommunications centres;
• telecommunications equipment and the datacom equipment, installed in customer's premises, whose power interface A3 is also used by equipment requiring a supply to the present document. The purpose of the present document is:
• to identify a power supply system with the same characteristics for all telecommunications and data communication equipment defined in the area of application;
• to facilitate interworking of different (types of) loads units;
• to facilitate the standardization of power supply systems for telecommunications and datacom equipment;
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