IEC 61097-4-2019 pdf free.Global maritime distress and safety system(GMDSS) – Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC) equipment – Operational and performance requirements,methods of testing and required test results.
Inmarsat-C ship earth stations (SES) capable of transmitting and receiving direct-printingcommunications, and for enhanced group call (EGC) receivers, for use in the GMDSS and foruse for long-range identification and tracking (LRIT).The available variants are:
Class 0:An EGC receiver, either stand-alone or an element of a GMDSS installation inaccordance with the Inmarsat design and installation guidelines (DIGs) forGMDSs installations.
Class 1:A basic SEs providing shore-to-ship and ship-to-shore message transfer only.
Class 2:As class 1 but with EGC as an alternative to shore-to-ship transfer using ashared receiver.
Class 3:As class 1 but with EGC using an independent receiver.
NOTE 1 The 34″ session of the lMO Sub-Committee on Radiocommunications decided that class 2 equipmentwould be adequate to provide sufficient availability for the reception of maritime safety information for the GMDss.
The standard complies with IMO performance requirements stated in the normativereferences，Inmarsat technical characteristics and test procedures,and lEC 60945 generalrequirements except where modifications are explicitly stated in this standard. Technicalcharacteristics essential to GMDSS and LRlT operation as defined by the lMO are identified.
All text of this standard， whose wording is identical to that in IMO SOLAS Convention 1974 asamended in 1988 and Resolutions A.807(19),MSC.263(84) and MSC.306(87) is printed initalics and reference made to the Resolution/Recommendation and subclause number.
This standard covers equipment construction and testing.Matters relating to installation mayalso be found in the Inmarsat Maritime design and installation guidelines (see Bibliography).Those to be found in MO Resolutions A.807(19)，MSC.263(84) and MSC.306(87) arereproduced in Annex A.
Responsibility for type approval of lnmarsat-C and Inmarsat-EGC is vested in Inmarsat byIMO Resolutions A.807(19) and MSC.306(87)(see 3.2.1).Therefore, this standard does notreproduce Inmarsat test procedures in fuill, but refers to where they are given in Inmarsatdocumentation cited in the normative references to this standard(Annex C).
Subclauses 3.2 through 3.4 of this standard describe performance requirements directlyattributable to IMO Resolutions A.807(19) and MSC.306(87) as listed in the normativereferences. Subclause 3.5 is provided to highlight those requirements of lMO ResolutionA.694(17) which are not included in the normal inmarsat requirements for Inmarsat-C SEStype approval.Subclause 3.6 describes other requirements which are required to make theequipment suitable for GMDSS applications. Subclause 3.7 describes performancerequirements attributable to lMO Resolution MSC.263(84) for long-range identification andtracking.
(A.807(19)A1.1/MSC.306(87)A1.1) The Inmarsat Standard-C ship earth station installationcapable of transmitting and receiving direct-printing communications,and the enhanced groupcall equipment to be used in the GMDss shall comply with the general requirements set out inAssembly resolution A.694(17) as detailed in lEC 60945 and this lEC standard.
(A.807(19)A2/MSC.306(87) 2)The ship earth station and the EGC equipment shall be type-approved by Inmarsat and shall comply with the environmental conditions andelectromagnetic compatibility requirements specified in lEC 60945.
(A.807(19)A4) In order to permit a warning of potential radiation hazards to be displayed inappropriate locations，a label shall be attached to the radome indicating the distancesexternal to the radome at which radiation levels of 100 W/m2，25 W/m2 and 10 w/m2 exist.However, the distances which are within the radome need not be indicated.
NOTE Due to the low transmitted power of lInmarsat-C transmitters (less than 16 dBW) and the omnidirectional antenna used, this label is not normally required.
(A.807(19)A5.2/MSC.306(87)A4.2) Changing from one source of supply to another or anyinterruption of up to 60 s duration of the supply of electrical energy shall not require theequipment to be manually re-initialized and shall not result in loss of received messagesstored in the memory.
The equipment shall comply with regulations lV/8 through lV/10 of SOLAS 1974, as amended,which ‘prescribe the capabilities of Inmarsat ship earth stations to meet the GMDSSrequirements for ships in the various sea areas.The four capabilities are:
– (SOLAS IV/8.1.5.1/IV/9.1.3.3 and lV/10.1.4.3): means of initiating the transmission of ship-to-shore distress alerts.
– (SOLAs lV/10.1.1.1): transmitting and receiving distress and safety communications using direct-printing telegraphy.
– (SOLAs IV/10.1.1.2): initiating and receiving distress priority calls.IEC 61097-4 pdf download.