...
All laboratories, chambers and other functional rooms have several network connectors. The connections are bundled in the Umformerraum by 4 Cisco switches. For operational reasons the whole network is subdivided in segments called VLANs. Thereby the network of laboratories, chambers, bridge and other connectors are seperated so that not the whole system failes in case of malfunction. Still, the single segments are connected in such way that computers of one segment can communicate with other computers, printers etc. via a router and TCP/IP.
WLAN is also available in all cabins and laboratories. But is dedicated to have access to ship's intranet only but not to external internet.
Connection to the internet is enabled from all network connections. A firewall and a package shaper are installed at the transition to the leased line for protection of the whole onboard network. The package shaper is a protocol filter that only allows defined network connections such as http and ftp in order to keep network traffic moderate.
...
The guaranteed availability for the whole ship of 128 kBit/s Upload / 448 kBit/s Download and 768 kBit/s Upload / 2048 kBit/s Download at the best are valid within the 10° elevation contour and the 44 dBW EIRP contour of the European coverage zone. The bandwidth may reach 1 Mbit/s under very favourable conditions. Operation is possible up to 0° elevation. However, the bandwidth and transmission quality are usually restricted depending on the ship's position and weather conditions.
Two antennas are installed to guarantee all time connection with no shadowing by ship's mast. Only one of both antennas can be active at a time.
Iridium internet connection is available after consultation of the ship's command beyond the European coverage zone. UMTS connection can be used to increase bandwidth to 7,2Mbit/s while staying in German ports.
...