Introduction
Luxury ocean liners have made a business out of providing passengers with premium service. In addition to fine food and entertainment, passengers can now enjoy access to the Internet to keep in contact with family, friends, and business associates. Providing Internet service not only benefits the passengers' own business interests, but also helps them keep abreast of current events. The liner also has the option to use the ship's LAN to provide passengers with popular entertainment resources, such as VOD (Video on Demand). Liners have two main requirements when it comes to network communication. The primary network is used for in-ship communication between cabins and the crew. In addition, the liner's LAN must also be able to link to the Internet via satellite. High-end managed Ethernet switches are one of the main tools used to integrate these two requirements into one network. Ethernet networks on ships must be capable of operating in critical environmental conditions that include severe vibrations, high humidity, and hot temperatures. In addition, the networks must be immune from interference caused by other devices used on the ship. As far as switches are concerned, the only option for reliable on-ship operation is a rugged industrial Ethernet switch designed to work in these kinds of adverse environments.  
Recommended Solution
With several decks and hundreds of cabins on each deck, a large ocean liner is akin to a small city. In fact, the total number of passenger quarters can be as high as one thousand. In order to allow all passengers to enjoy the convenience of Internet access and VOD service, the ship's network must be able to reach every room. Moreover, the ship's network administrator must have access to an online management utility to manage, monitor, and control network devices, as well as provide a secure network environment to protect passengers' data . For these reasons, such networks should use Ethernet switches that have management capability and the ability to establish a redundant ring topology.
The ship's network is composed of several rings distributed over individual decks, with each ring connected to a central control room. To allow better control and management over the network, the switches selected to form the rings are equipped with network management functions such as VLAN, QoS, IGMP snooping, and e-mail notification of abnormal conditions. The VLAN function gives system administrators an easy way to segment the network into several "virtual" LANs that act the same as if the LANs were not physically connected. For example, the "leisure" networks used by passengers can be separated from the "essential" networks used by the crew for on the job communication.
Passengers can connect to the Internet via network ports located in each room. The typical setup is to use a DHCP server to share a limited number of IP addresses with all of the rooms. All outside data is transmitted and received with an antenna to geocentric satellites. For system administrators, transmission priority, bandwidth, and security are controlled and monitored with a browser-based management utility built into the switch.
 
 
  Why Moxa?
 
  Moxa's EDS-508A series of industrial Ethernet switches are certified by DNV and GL type approval and prime industry standards to ensure reliable operation in the rugged ship environment.
     
  Easy configuration and real-time administration via a browser-based management utility:
   
  Virtual LAN eases network planning
  QoS to increase determinism of data transmission
  IGMP snooping and bandwidth control for better traffic management
  Manageable real time alerts when exceptions arise
 
  EDS-508A series supports fiber optic ports to handle long distance transmission from different decks to the ship's central control room.
     
  EDS-508A series switches are rated to operate at temperatures from 0 to 60°C, which is reliable enough to survive in the demanding ship environment ("-T" models are rated for -40 to 75°C).
     
  Moxa's Turbo Ring supports fast media redundancy, with a recovery time of less than 20 ms, providing customers with a reliable and stable network.
 
 
Key Products
 
 
EDS-728 24+4-G-port Modular Managed Ethernet Switch
  Modular design with 4 Gigabit plus 24 fast Ethernet ports for copper and fiber
  Up to 4 Gigabit port for Gigabit backbone and uplinks
  Gigabit Turbo Ring, Turbo Chain, and RSTP/STP for Ethernet redundancy
  Modbus/TCP, LLDP, IGMP, QoS, VLAN, LACP, IEEE 802.1X, SSH, and more
 
 
 
EDS-508A Series 8-port Managed Ethernet Switch
  Turbo Ring and Turbo Chain Ethernet redundancy (recovery time < 20 ms)
  Modbus/TCP, IEEE 1588 PTP, LLDP, DHCP Option 82, SNMP inform, QoS, IGMP snooping, VLAN
  IEEE 802.1X, HTTP, SSH, SNMPv3, and port security
  -40 to 75ºC operating temperature range (T models)
  Supports long-haul transmissions (up to 80 km)
 
 
 
 
 
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