JRC Alphatron SSRS User manual

Alphatron SSRS
Sound Reception System
Installation and Operation Manual
www.jrc.am

Contents
I Preface..........................................................................................................4
I.1 Revision History........................................................................................................................................................4
I.2 Glossary.................................................................................................................................................................... 4
I.2.1 Abbreviations....................................................................................................................................................4
I.2.2 Standards.........................................................................................................................................................5
II Cautions...................................................................................................... 7
III Introduction................................................................................................8
III.1 Product Description.................................................................................................................................................8
III.2 System Description................................................................................................................................................. 8
1 Installation.................................................................................................10
1.1 Microphone Unit.....................................................................................................................................................10
1.2 Display Unit............................................................................................................................................................12
2 Operation...................................................................................................14
2.1 Operational Modes.................................................................................................................................................14
2.1.1 Normal Mode.................................................................................................................................................14
2.1.2 Manual Listening Mode.................................................................................................................................15
2.1.3 Calibration Detection Mode...........................................................................................................................16
2.1.4 LED Test Mode.............................................................................................................................................16
2.2 Network Operations................................................................................................................................................17
2.2.1 PJTR Sentence.............................................................................................................................................17
2.2.1.1 SRS Proprietary Sentence...................................................................................................................18
2.2.1.2 VOL Proprietary Sentence...................................................................................................................18
2.2.1.3 HBT Sentence......................................................................................................................................19
2.2.2 DDC Sentence.............................................................................................................................................. 19
2.2.3 Maximum Data Rates................................................................................................................................... 20
2.3 Syslog Messages...................................................................................................................................................20
2.4 Audio Packet Stream.............................................................................................................................................20
2.5 Error Indicator........................................................................................................................................................ 21
2.6 Detecting a Sound Signal......................................................................................................................................22
2.7 Detecting Multiple Sound Signals..........................................................................................................................23
2.8 Adjusting Volume and Lighting..............................................................................................................................24
2.9 Web Interface.........................................................................................................................................................24
2.9.1 Home Screen................................................................................................................................................ 25
2.9.2 Network Settings...........................................................................................................................................27
2.9.3 Audio Settings...............................................................................................................................................29
2.9.4 System Log...................................................................................................................................................30
2.9.5 Additional Options.........................................................................................................................................32
2.10 Testing..................................................................................................................................................................33
2.10.1 Calibration and Testing...............................................................................................................................33
3 Specifications............................................................................................34
2 | Contents

4 Maintenance..............................................................................................35
4.1 Troubleshooting......................................................................................................................................................35
4.1.1 Microphone Surveillance Failure...................................................................................................................35
4.1.2 LED Surveillance Failure.............................................................................................................................. 36
4.1.3 Fog Horn Detection Failure.......................................................................................................................... 36
4.1.4 Display Device Boot Failure..........................................................................................................................36
4.2 Service....................................................................................................................................................................36
4.3 Spare Parts............................................................................................................................................................37
4.4 Recycling and Disposal..........................................................................................................................................37
4.5 Test and Maintenance Records.............................................................................................................................38
5 Drawings....................................................................................................39
5.1 SSRA Microphone Unit..........................................................................................................................................39
5.2 SSRD Display........................................................................................................................................................ 40
5.3 Connection Diagram Microphone Unit...................................................................................................................41
5.4 Connection Diagram Display................................................................................................................................. 42
5.5 Cable Diagram.......................................................................................................................................................43
3 | Contents

I Preface
The Alphatron SSRS sound reception system has been designed to make sound signals from other ships audible by
personnel whilst they are in the fully enclosed bridge space. The system complies with all the latest applicable standards
and has been tested with the most modern test instrumentation and detailed test procedures ensuring a top quality
product.
All information contained in this manual has been verified for correctness however, no responsibility is assumed by
Alphatron for inaccuracies. Alphatron does not assume any liability arising out of the application or use of the described
product.
I.1 Revision History
Revision No. Description Date
V0.9 Preliminary 17 March 2016
V1.0 First Issue 28 April 2016
V1.1 Changed article nr.'s Cable Diagram 10 may 2016
V1.2 Changed Connection diagram 17 January 2020
I.2 Glossary
The Glossary contains a list of commonly used abbreviations and a list of applicable standards.
I.2.1 Abbreviations
Abbreviation Meaning
CMOS Complementary Metal-Oxide Semi conductor
ESD Electrostatic Discharge
DDC Display Dimming Control (sentence)
DHCP Dynamic Host Configuration Protocol
HBT Heartbeat (sentence)
HTTP Hypertext Transfer Protocol
Hz Hertz (unit of frequency)
IC Integrated Circuit (system)
IEC International Electrotechnical Commission
IMO International Maritime Organization
IP Internet Protocol (address)
ISO International Organization for Standardization
kB/s Kilobytes per second
kHz Kilohertz
LED Light-Emitting Diode
PCM Pulse Code Modulation
PJTR Jotron Proprietary Sentence
RMA Return Material Authorization number
4 | Preface

Abbreviation Meaning
RTCP Real-time Transport Control Protocol
RTP Real-time Transport Protocol
SFI System Function ID
SOLAS Safety of Life at Sea
SPL Sound Pressure Level
SRS Sound Reception Signal (proprietary sentence)
VDC Voltage Direct Current
VOL Volume (proprietary sentence)
Table 1: Abbreviations
I.2.2 Standards
The Alphatron SSRS Display Unit has been verified, tested and meets the product standards as listed in Table 2:
Standards on page 5
Standard Description
ISO 14859:2012 Ships and marine technology - Sound reception systems:
IEC 60945:2002 Maritime navigation and radio communication equipment and systems - General
requirements - Methods of testing and required test results.
IEC 61162:2010-1 Maritime navigation and radio communication equipment and systems – Digital interfaces -
Part 1: Single talker and multiple listeners.
IEC 61162:2011-450 Maritime navigation and radio communication equipment and systems - Digital interfaces -
Part 450: Multiple talkers and multiple listeners - Ethernet interconnection.
IEC 62288 Edition
2:2014 Maritime navigation and radio communication equipment and systems – Presentation of navigation-related information on shipborne navigational displays – General requirements,
methods of testing and required test results.
Table 2: Standards
The Alphatron SSRS Display Unit also fulfills the requirements as listed in Table 3: Requirements on page 5
Requirement Description
SOLAS Chapter
V - Safety of
navigation -
Regulation 19
Carriage requirements for shipborne navigational systems and equipment.
IMO Res.
A.694(17) General requirements for shipborne radio equipment forming part of the Global Maritime Distress and Safety System (GMDSS) and for electronic navigational aids.
IMO Res.
MSC.36(63) Adoption of the international code of safety for high speed craft (1994).
IMO Res.
MSC.86(70) Adoption of new and amended performance standards for navigational equipment.
5 | Preface

Requirement Description
IMO Res.
MSC.97(73) Adoption of the international code of safety for high speed craft (2000).
IMO Res.
MSC.191(79) Performance standards for the presentation of navigation-related information on the shipborne navigational displays.
Table 3: Requirements
Note This product is also ship wheel-mark and type approval of marine products certified in accordance with
Marine Equipment Directive (MED).
6 | Preface

II Cautions
The following symbols are used in this manual regarding safety:
• Caution damage.
• This symbol is used to highlight information that if not followed can result in damage to a product or
equipment.
• Warning injury / death
• This symbol is used to highlight information that if not followed can result in personal injury or death.
7 | Cautions

III Introduction
III.1 Product Description
The Alphatron SSRS sound reception system has been designed to:
• Receive and detect fog horn sounds from other vessels and pinpoint the direction of the signal source.
• Detect signals with a fundamental frequency ranging from 70 Hz to 820 Hz.
Detected horns are amplified and played through the speaker on the display unit and the direction of the signal source
appears on the display, with an accuracy of +/- 10 degrees. The Alphatron SSRS has adaptive background noise
canceling to filter out unwanted sounds through advanced digital signal processing. Multiple display units can share the
same microphone unit through an Ethernet connection.
Part Numbers
For part numbers refer to Spare Parts on page 37
• Caution: Electrostatic Devices
• This equipment contains CMOS integrated circuits. Observe precautions for handling electrostatic sensitive
devices. Electrostatic discharge (ESD) may damage this equipment.
Figure 1: Product Image Display Figure 2: Product Image Microphone
III.2 System Description
A sound reception system is an acoustical electronic navigational aid that enables an individual to hear sound signals
from other ships like fog horns when standing inside a totally enclosed bridge space. This is to perform the look-out
function as required according to the International Regulations for Preventing Collisions at Sea, 1972.
The system works by listening and detecting the direction of a fog horn. The Alphatron SSRS system is always listening
for sounds on the outside of the ship and will only playback and display sounds once a horn has been detected. The
ship's own horn can be suppressed by closing a closing contact on the Alphatron SSRS system, which will disable
detection for the duration it is held closed.
8 | Introduction

Figure 3: Sound Reception System
9 | Introduction

1 Installation
1.1 Microphone Unit
Figure 4: Top Mounted Figure 5: Side Mounted
1. Fasten the microphone with the attached mounting bracket to the ship, or remove the bracket and attach the steel
tube by other means.
Note The mounting bracket can be mounted to a ship by the top or the side.
Note The "Fore" direction of the microphone unit is marked with an arrow and should be pointing towards the
bow of the ship when installed.
• Caution: Install the Microphone Unit in an appropriate location and ensure the following:
• Install in a location far away from noise and any mechanical vibration sources.
• Do not install the microphone next to a sound reflective source or obstacle that may block sound from
entering the microphone unit in a straight line.
• Install the microphone unit in a typical lookout position.
2. Wire the cables from the microphone unit to a junction box suited to the environment it is placed in.
Note The cables are 3 meters long with flying leads.
3. Lay a cable from the junction box to the display unit. See Figure 38: Cable Diagram on page 43.
4. Terminate the cable in the 11 pin microphone connector at the back of the display unit when connecting the
microphone to the display unit. See Figure 36: Connection Diagram SSRA on page 41
10 | Installation

The cable must be shielded and contain at least 5 twisted pairs made of bare copper and have a lead core size of
0.25mm2 or larger when the cable length is up to 100m. If a longer stretch of cable is required (up to a maximum of 200
m), use a lead core size of 0.5mm2 or larger.
Figure 6: Wiring Schematic
WH White Port +
BN Brown Port -
GN Green Aft +
YE Yellow Aft -
GY Grey Strb +
PK Pink Strb -
BU Blue Fore +
RD Red Fore -
BK Black GND
VT Violet Vinn
11 | Installation

Note Clarification of the notes in Connection Diagram: (Figure 6: Wiring Schematic on page 11).
1. Refer Cable and Connection Diagrams regarding supply of cables. The cable must be shielded with individual
pairs and have a minimum 0.25mm2 core size.
2. A junction box is optional and can be supplied by Alphatron.
3. To comply with EMC requirements, all cable screens must be safely connected to chassis as shown in Figure
6: Wiring Schematic on page 11.
4. To mute signal to the Alphatron SSRA. A closing contact (NO) will mute the sound reception system while
closed. Generally, this input is used by the ship's Typhoon system.
Figure 7: Ethernet Electrical Connections
The set up for the master/slave, web interface via a computer or connection to an IEC 61161-450 network is as shown
above.
Note The cable must be a minimum of Cat. 5 S/UTP quality. Master/Slave can be connected directly together or
via a LAN switch.
1.2 Display Unit
Install the display unit in such manner that incoming sounds signals and incoming sounds can be heard at all positions
inside the bridge and are visible from the conning position.
Note Prior to fastening the unit to a console the power and microphone unit connectors must be connected,
unless the device is used as a slave device to another display unit.
12 | Installation

Figure 8: Place Frame on Cutout Figure 9: Screw Fix Frame
Figure 10: Place Display Unit Figure 11: In Place
1. Mount the display unit in a bridge console, or similar structure.
Note Plug in the Ethernet cable, if the network features of the display unit will be used.
2. Screw fix the frame with four screws to the cutout where the Display Unit is to be placed.
Note Screws are provided.
3. Place the Display Unit into the cutout and firmly press down on the four corners.
Note Snap-on clips are located on the back of the Display Unit, which fit exactly into the four holes provided
in the mounting plate. See Figure 35: SSRD Display on page 40.
To remove the display firmly grip the panel with the tops of the fingers and pull backwards and up at the same time. Do
not use screwdrivers as these will damage the display cover and paint work of the console.
The display unit has a mute closing contact, this can also be attached to the fog horn system on the ship. This contact
suppresses detection when the contact is closed and begins again when it is open.
Advanced configuration options can be performed using the web interface.
13 | Installation

2 Operation
2.1 Operational Modes
The Alphatron SSRS display unit has four different operational modes.
Figure 12: Normal Mode, Idle.
Press and hold the CONTROL rotary button for 5 seconds, to switch between modes.
Note Keep the button depressed to advance to the next mode. The mode will change every 5 seconds.
2.1.1 Normal Mode
When the Alphatron SSRS is first started it will start in the normal mode. When in this mode the unit will idle until a horn
signal is detected. Detected horns are audible from the speaker and indicate the direction of the source of the signal.
Within the first 3 seconds of detection an 80 degree arch will light up in orange, while the center of the arch is lit in red.
After having been on for 3 seconds the red light remains active. Multiple indications can be active at once. The indication
pointer will remain for a configurable amount of time (7 seconds by default), after the detection is finished. The indication
pointer configuration time can be altered within the web interface.
The light behind the CONTROL button is off when the unit is in this mode.
The volume and lighting can be adjusted. To adjust the volume or lighting, perform the following actions:
1. Press the CONTROL button until the option you wish to adjust is orange.
2. Rotate the CONTROL button to observe the volume or dimmer changes.
Note The active adjustment line is lit up orange and the inactive line is lit up green. This is also indicated by
the lights on the left of the control button.
14 | Operation

2.1.2 Manual Listening Mode
Figure 13: Selecting the Fore Microphone Figure 14: Selecting the Aft Microphone
In the manual mode each of the four microphones can be listened to individually. In this mode the sound from the active
microphone is audible through the speaker at all times.
To activate the manual listening mode, perform the following actions:
1. Press and hold the CONTROL button for 5 seconds when in the normal mode.
When active the light around the CONTROL button appears green.
2. Rotate the CONTROL button to select the Fore microphone.
Note Neither the volume nor dimmer row is lit orange when the microphone is selected.
3. Rotate the CONTROL button to select the Aft microphone.
Note When the device first enters the manual listening mode it activates the 'Fore' microphone. The current
active microphone is displayed on the indication ring with the active LEDs indicating the direction of the
microphone that is active.
15 | Operation

2.1.3 Calibration Detection Mode
Figure 15: No Offset (0°) Figure 16: Offset 30°
Use the calibration detection mode to adjust the offset display. For example to adjust the offset of an incorrectly mounted
microphone unit.
1. Press and hold the CONTROL button for 10 seconds.
When the calibration mode is activated the light behind the CONTROL rotary button changes to orange.
Note If the unit is in the manual listening mode, the CONTROL button only has to be pressed and held for 5
seconds.
2. Rotate the CONTROL button to calibrate the position, to add (right) or subtract (left) the offset for all detections.
The current offset is indicated by the indication LEDs. A more precise offset can be set in the web interface.
Note The default is a zero degree offset and a single tick with the CONTROL button will adjust the offset by
10 degrees.
2.1.4 LED Test Mode
To enter the LED test mode, perform the following actions:
1. Press and hold the CONTROL button for 15 seconds, when in normal mode.
All LEDs on the display unit will light up when enabled, making any failed LEDs visible.
Note If the manual listening mode is active, press and hold the CONTROL button for 10 seconds.
Note If the calibration detection mode is active, press and hold the CONTROL button for 5 seconds.
2. Hold the CONTROL button depressed for another 5 seconds to return to normal operation..
Note The LED test mode will automatically return to normal mode if the CONTROL button is not pressed or
rotated for 30 seconds.
16 | Operation

2.2 Network Operations
The Alphatron SSRS performs multiple network operations according to part 450 of the IEC 61162 standard. This
includes inter-device communication and logging.
The transmission groups are mapped to the following multicast addresses and ports:
Transmission group Address port combo:
MISC 239.192.0.1:60001
PROP 239.192.0.8:60008
USR1 239.192.0.9.60009
USR2 239.192.0.10.60010
USR3 239.192.0.11.60011
USR4 239.192.0.12.60012
USR5 239.192.0.13.60013
USR6 239.192.0.14.60014
USR7 239.192.0.15.60015
USR8 239.192.0.16.60016
Table 4: Transmission Groups
Note These transmission groups are defined in part 450 of the IEC 61162 standard.
Multiple IE 61162-450 sentences are sent and received by the Alphatron SSRS display device.
List of the applicable sentences:
• PJTR sentences (SRS proprietary sentences and VOL proprietary sentences)
• HBT sentences
• DDC sentences
Note For more information or clarification regarding these sentences, refer to IEC 61162-450.
2.2.1 PJTR Sentence
The PJTR sentence is a proprietary sentence that is used for communication between the master and slave Alphatron
SSRS display units.
The first parameter of this sentence is the sentence code for our proprietary sentences. The remaining parameters
depend on the sentence code that is sent.
The Alphatron SSRS has the following three proprietary sentences:
• Sound Reception Signal (SRS)
• Volume (VOL)
• Heartbeat (HBT)
17 | Operation

2.2.1.1 SRS Proprietary Sentence
When a sentence code of the PJTR sentence is sound reception signal (SRS), the sentence is a detection notification.
This sentence is sent from master units to the configured transmission group such that slaves can receive them.
The SRS sentence has three additional parameters:
Description Type
Direction of the detection An integer between 0° and 359° inclusive.
Score of the detection Score with decimal point if needed.
Base frequency of the detected signal Frequency with decimal point if needed.
Figure 17: Example, SRS proprietary sentence
2.2.1.2 VOL Proprietary Sentence
When a sentence code of the PJTR sentence is volume (VOL), the sentence is a volume adjustment notification. This
sentence is sent from both the master and the slave units when the volume is adjusted using the CONTROL button
on the display unit. The sentence is sent on the configured transmission group. When an Alphatron SSRS display
unit receives such a message it will automatically adjust the volume to match the volume of the device that sent the
sentence.
The VOL sentence has one additional parameter:
Description Type
New volume setting An integer between 0 and 99 inclusive.
Figure 18: Example, VOL proprietary sentence
18 | Operation

2.2.1.3 HBT Sentence
The Alphatron SSRS sends a heartbeat (HBT) sentence once every 60 seconds. This sentence is sent to the MISC
transmission group. It is equal to the standard HBT sentence, except that it is sent as a parameter to the PJTR sentence.
Note Refer to IEC 61162-1 standard for more information regarding heartbeat sentence.
Figure 19: Example, HBT sentence
2.2.2 DDC Sentence
The Alphatron SSRS display unit listens for display dimming control (DDC) sentences sent from any other unit on the
network, that sends on the MISC channel, or uses the same transmission group as configured in the web interface
network settings.
When a DDC sentence is received, the display device will adjust the brightness to the new level received.
Two variants of the DDC messages are supported; one with and one without the sentence status parameter at the end of
the sentence.
Note Refer to IEC 61162-1 standard for more information regarding the two variants and the DDC sentence.
Figure 20: Example, DCC sentence
Note The two dashes before the DDC message represents the sender and can be any two upper case
characters from A-Z.
19 | Operation

2.2.3 Maximum Data Rates
These are the maximum data rates as required by 61162-450, section 4.3.2:
Description Amount
Maximum received per second, intended for target 50/sec
Maximum received per second, not intended for target 2000/sec
Maximum received per second, not intended for target at 50% of the maximum load. 1000/sec
Table 5: Maximum Data Rates
2.3 Syslog Messages
When Syslog network logging is enabled, Syslog messages are sent to the network address specified in the web
interface (seeTable 6: Syslog Messages on page 20. Refer to the network settings for more information.
Message ID Message text Additional information
SURV_AUDIO_FAILURE Surveillance failed for audio
channels: <Mask> <Mask> is replaced with a bitmask in hex of the channels that have failed audio surveillance. Available
channels:
• 0x1 Fore
• 0x2 Aft
• 0x4 Starboard
• 0x8 Port
For example, 0xC indicates a failure of port and
starboard microphones.
SURV_LED_FAIL Bad health state of LED <LED
id> <LED id> is replaced with the ID of the LED that failed.
SURV_WDOG_NOT_
FEEDING Not feeding watchdog because all required tests
have not been passed:
<Mask>
Message informing that the unit will restart due to
a failing watchdog test. <Mask> is replaced with a
bitmask in hex that identifies the failing test. Tests
include:
• 0x1 Audio surveillance test
• 0x2 DSP surveillance test
• 0x4 Display response surveillance test
Table 6: Syslog Messages
2.4 Audio Packet Stream
A proprietary audio packet stream is sent together with all other network traffic.
This stream contains the audio data from a detected fog horn signal. A master device sends the data to the multicast
group at 239.192.0.65 on port 5004 and 5005. This audio packet stream is an RTP stream with RTP data on port 5004
and RTCP data on port 5005. The audio is sent as a single channel 24 bit signed PCM at a 24 kHz sampling rate. The
RTP stream uses a packet size of 20 ms.
An audio stream is only sent when a fog horn is detected and stops when the detection ends.
The maximum bandwidth used by this stream is 96 kB/s, with approximately 50 packets per second.
20 | Operation