TIÊU CHUẨN VỚI VHF DSC CLASS A
PERFORMANCE STANDARDS FOR SHIPBORNE VHF RADIO INSTALLATIONS CAPABLE OF VOICE COMMUNICATION AND DIGITAL SELECTIVE CALLING
MSC.511(105)
PART A – GENERAL
1 INTRODUCTION
1.1 This equipment meets the requirement for VHF installations on ships as required by SOLAS regulations IV/7.1.1, 7.1.2 and 8.2.
1.2 The VHF radio installation, 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 performance standards.
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 calls using both voice and digital selective calling (DSC): .1 distress, urgency and safety; .2 ship operational requirements; and .3 general radiocommunications.
2.3 The equipment should provide for the following categories of communications using voice: .1 distress, urgency and safety; .2 ship operational requirements; and .3 general radiocommunications.
2.4 The equipment should comprise at least: .1 a transmitter/receiver including antenna; .2 an integral control unit or one or more separate 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 digital selective calling facility; and .6 a dedicated DSC watchkeeping facility to maintain a continuous watch on channel 70.
2.5 The installation may also include additional receivers.
2.6 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 associated with 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.
2.7 The dedicated distress button should: .1 be clearly identified and be 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.
2.8 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.
2.9 The equipment should indicate the status of the distress alert transmission.
2.10 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.
3 POWER SUPPLY
The VHF radio installation should be powered from the ship’s main source of electrical energy. In addition, it should be possible to operate the VHF installation from an alternative source of electrical energy.
4 CONTROLS AND INDICATORS
4.1 Control of the equipment should be possible at the position from which the ship is normally navigated. Control from that position should have priority if additional control units are provided. When there is more than one control unit, indication should be given to the other units that the equipment is in operation.
4.2 The equipment should provide a standard interface to enable the selections of channels and setting of Maritime Mobile Service Identity (MMSI) to be called from a remote control unit (e.g. INS) by using standardized interfaces.1
4.3 DSC controls and indicators 4.3.1 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 part A – General, paragraphs 2.6 to 2.8. 4.3.2 Initiation of DSC distress calls should supersede any other operation of the facility. 4.3.3 Self-identification data should be stored in the DSC unit. It should not be possible for the user easily to change these data. 4.3.4 Means should be provided to enable routine testing of the DSC facilities without radiation of signals. 4.3.5 Provision should be made for: .1 specific alerts to indicate receipt of a distress or urgency calls or a call having distress category.2 It should not be possible to disable this alarm and indication. Provision should be made to ensure that they can be reset only manually; and .2 alerts for calls other than distress and urgency.
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, maritime safety information (MSI) or search and rescue (SAR) related information to 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.3
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. 1 Refer to IEC 61162. 2 Recommendation ITU-R M.493. 3 Refer to IEC 61162.
6.2 Visual indications and visual presentations of text and graphics of the system should conform to resolution MSC.191(79), as amended.
PART B – TRANSMITTER
1 FREQUENCIES AND CLASSES OF EMISSION
1.1 The equipment should be designated for operation on channels selected from and in accordance with appendix 18 to the Radio Regulations.
1.2 The radiotelephone facility should be capable of operating as follows: .1 in the band 156.025 MHz to 157.425 MHz on single-frequency channels as specified in appendix 18 to the Radio Regulations; and .2 in the band 156.025 MHz to 157.325 MHz for transmitting and the band 160.625 MHz to 161.925 MHz for receiving on two-frequency channels as specified in appendix 18 to the Radio Regulations. 1.3 The digital selective calling facility should be capable of operating on channel 70. 1.4 Class of emission should comply with chapter IX of the Radio Regulations.
2 FREQUENCY ACCURACY AND TOLERANCE
The frequency tolerance for ship station transmitters should not exceed 10 parts in 106 .
3 OUTPUT POWER
3.1 The transmitter output power should be between 6 and 25 W.
3.2 Provision should be made for reducing the transmitter output power to a value of less than 1 W. However, this reduction of the power is optional on channel 70.
4 PERMISSIBLE WARMING-UP PERIOD
The equipment should be operational within five seconds after switching on.
5 CONTINOUS OPERATION
A manual non-locking push-to-talk switch to operate the transmitter with a visual indication that the transmitter is activated and facilities to limit the transmission time to a maximum of five minutes should be provided.
6 CONTROLS AND INDICATORS
6.1 Channel control and switching
6.1.1 Change of channel should be capable of being made as rapidly as possible, but in any event within five seconds.
6.1.2 The time taken to switch from the transmit to the receive condition, and vice versa, should not exceed 0.3 seconds.
6.1.3 An on/off switch should be provided for the entire installation with a visual indication that the installation is switched on.
6.1.4 A visual indication that the carrier is being transmitted should be provided.
6.1.5 The equipment should indicate the four-digit channel number, as given in the Radio Regulations appendix 18, to which it is tuned. It should allow the determination of the channel number under all conditions of external lighting. Where practicable, channels 16 and 70 should be distinctively marked. 6.1.6 The equipment should not be able to transmit during a channel switching operation. 6.1.7 Operation of the transmit/receive control should not cause unwanted emissions. 6.2 Radiotelephone facility 6.2.1 Provision should be made for changing from transmission to reception by use of a press-to-transmit switch. Additionally, facilities for operation on two-frequency channels without manual control may be provided. 6.2.2 The receiver should be provided with a manual volume control by which the audio output may be varied. 6.2.3 A squelch (mute) control should be provided on the exterior of the equipment. 6.3 Loudspeaker and telephone handset (radiotelephone facility) 6.3.1 The receiver output should be suitable for use with a loudspeaker and a telephone handset. The audio output should be sufficient to be heard in the ambient noise level likely to be encountered on board ships. 6.3.2 It should be possible to switch off the loudspeaker without affecting the audio output of the telephone handset, if provided. 6.3.3 In the transmit condition during simplex operation, the output of the receiver should be muted. 6.3.4 In the transmit condition during duplex operation, only the telephone handset should be in circuit. Care should be taken to prevent any electrical or acoustic feedback, which could cause singing.
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