TIÊU CHUẨN CHO MFHF
PERFORMANCE STANDARDS FOR SHIPBORNE MF AND MF/HF RADIO INSTALLATIONS CAPABLE OF VOICE COMMUNICATION, DIGITAL SELECTIVE CALLING AND RECEPTION OF MARITIME SAFETY INFORMATION AND SEARCH AND RESCUE RELATED INFORMATION
MSC.512(105)
PART A – GENERAL
1 INTRODUCTION
The MF and MF/HF radiotelephone, digital selective calling (DSC) and reception of maritime safety information (MSI) and search and rescue (SAR) related information installation carried to meet any of the requirements of SOLAS regulations IV/9, 10 or 11, in addition to meeting the requirements of the Radio Regulations, the relevant ITU-R Recommendations and the general requirements set out in resolutions A.694(17) and MSC.191(79), as amended, should comply with the following minimum requirements.
2 GENERAL
2.1 The installation, which may consist of more than one piece of equipment, should be capable of operating on single-frequency channels or on single- and two-frequency channels.
2.2 The equipment should provide for the following categories of calling, using both voice and DSC: .1 distress, urgency and safety; .2 general radiocommunications; and .3 ship operational requirements.
2.3 The equipment should provide capabilities for the reception and processing of MSI and SAR related information.
2.4 The equipment should comprise at least: .1 a transmitter/receiver, including antenna(e); .2 an integral main control unit and/or one or more separate control units, or control functions in an integrated communication system, with the possibility of separate slave control units; .3 a microphone with a press-to-transmit switch, which may be combined with a telephone in a handset; .4 an internal or external loudspeaker; .5 an integral or separate capability for reception and presentation of MSI and SAR related information; .6 an integral or separate DSC facility;
.7 a dedicated DSC watchkeeping facility to maintain a continuous watch on distress channels. Where a scanning receiver is employed to watch more than one DSC channel, all selected channels should be scanned within two seconds and the dwell time on each channel should be adequate to allow detection of the dot pattern which precedes each DSC call. The scan should only stop on detection of a 100 baud dot pattern; and .8 an integral or separate facility to establish a connection between stations of the maritime mobile service by simple means using DSC.1
2.5 A distress alert should be activated only by means of a dedicated distress button. This button should not be any key of an ITU-T digital input panel or an ISO keyboard provided on the equipment and should be physically separated from functional buttons/keys used for normal operation. This button should be a single button for no other purpose than to initiate a distress alert.
2.6 The dedicated distress button should: .1 be clearly identified, red in colour and marked “DISTRESS”. Where a non-transparent protective lid or cover is used, it should also be marked “DISTRESS”; and .2 be protected against inadvertent operation. The required protection of the distress button should consist of a spring-loaded lid or cover permanently attached to the equipment by, for example, hinges. It should not be necessary for the user to remove additional seals or to break the lid or cover in order to operate the distress button. The operation of the distress button should generate a visible and audible indication. The distress button should initiate a distress alert when kept pressed for at least three seconds. A flashing light and an intermittent acoustic signal should start immediately. After the three seconds the transmission of the distress alert is initiated and the indication should become steady and the acoustic signal should stop. If the distress button is released before a distress alert is initiated, the light should go out and the acoustic signal should stop.
2.7 The distress alert initiation should require at least two independent actions. The lifting of the protective lid or cover is considered as the first action. Pressing the distress button as specified above is considered as the second independent action.
2.8 The equipment should indicate the status of the distress alert transmission.
2.9 It should be possible to interrupt and initiate distress alerts at any time and to interrupt repetitive transmissions of distress messages. Such operation should not interrupt the transmission of a distress alert or distress message in progress but should prevent repetitive transmissions of a distress message.
2.10 Valid GNSS position and timing data from either an internal or external source should be available to the equipment at all times. The loss of position information should generate a visible or audible indication.
3 POWER SUPPLY
3.1 The MF and MF/HF radio installation should be powered from the ship’s main source of electrical energy. In addition, it should be possible to operate the installation from an alternative source of electrical energy including a reserve source of energy.
3.2 If it is necessary to delay the application of voltage to any part of the transmitter after switching on, this delay should be provided automatically.
3.3 If the transmitter or receiver or both include parts which are required to be heated in order to operate correctly, for example crystal ovens, the power supplies to the heating circuits should be so arranged that they can remain operative when other supplies to or within the equipment are switched off. If a special switch for the heating circuits is provided, its functions should be clearly indicated; it should normally be in the “on” position and be protected against inadvertent operation. The correct operating temperature should be reached within a period of five minutes after the application of power.
4 CONTROL AND INDICATORS
4.1 Operational controls 4.1.1 It should be possible to initiate distress alerts and conduct distress and safety communications from the position, or in the vicinity of the position, from which the ship is normally navigated. 4.1.2 The equipment should provide a standard interface to enable the selections of frequencies and setting of MMSI to be called from a remote control unit (e.g. INS) by using standardized interfaces.2 4.1.3 The equipment should provide functionality to establish connection with other stations of the mobile maritime service by simple means using the DSC “Automatic Connection System”.3 4.1.4 The equipment should provide visual and audible indication of any distress alert or alerts received on board at the position from which the ship is normally navigated, which may be different from the position of the primary control of the equipment.
4.2 Transmitter controls 4.2.1 Provision should be made for indicating the antenna current or power delivered to the antenna. Failure of the indicating system should not interrupt the antenna circuit. 4.2.2 Manually tuned equipment should be fitted with a sufficient number of indicators to permit accurate and rapid tuning. 4.2.3 Operation of the transmit/receive control should not cause unwanted emissions. 4.2.4 All adjustment and controls necessary for switching the transmitter to operate on 2 182 kHz and 2 187.5 kHz should be clearly marked, in order that these operations may be performed readily.
4.3 Receiver controls The receiver should be provided with automatic gain control.
4.4 DSC controls and indicators 4.4.1 It should be possible to initiate and make distress and safety calls from the position from which the ship is normally navigated. The means for initiating a distress call should be as prescribed in 2.5 to 2.9 of part A. 4.4.2 Initiation of DSC distress calls should take precedence over any other operation of the facility. 4.4.3 Self-identification data should be stored in the DSC unit. It should not be possible for the user to easily change these data. 4.4.4 Means should be provided to enable routine testing of the DSC facilities without radiation of RF signals. 4.4.5 Provision should be made for alerts with specific audible signals and visual indications to indicate receipt of a distress or urgency call or a call having a distress category.4 It should not be possible to disable this alert. Provision should be made to ensure that it can be reset only manually.
5 INTERFACES
5.1 Where the equipment is part of an integrated communication system (ICS), integrated navigation system (INS), integrated bridge system (IBS) or connected to a navigation system, this should not impair any of the GMDSS functions of the system or the equipment itself.
5.2 Equipment should provide an interface for bridge alert management (BAM) in accordance with resolution MSC.302(87) on Performance standards for bridge alert management.
5.3 The equipment should provide an interface to report a ship identifier and location data from a received distress alert, MSI or SAR related information to a navigation display system in order to enable a graphical display and possible linking to available target information.
5.4 All interfaces provided for communication with other navigation and communication equipment should comply with the relevant international standards.
6 HUMAN-MACHINE INTERFACE
6.1 The human-machine interface (HMI) should provide all functions necessary to carry out all communication procedures including those required by the GMDSS.
6.2 Visual indications and visual presentations of text and graphics of the system should conform to resolution MSC.191(79), as amended.
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