MARITIME TACTICAL WIDE AREA NETWORKING (MTWAN ...

Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2TOPOLOGY109. The MWTAN is a distributed system. As a distributed network, there are twoconsiderations: the network topology (‗what is connected to what, with what constraints?‘)and the physical location (‗what is physically near what?‘). In terms of topologies, MTWANemploys either a single-AS TGAN topology or a multiple-AS TGAN topology. The latter isgenerally employed to allow nations within an MTWAN to administer their own mobile units.SINGLE AS TGAN TOPOLOGY110. An example of a single-AS TGAN is shown in Figure 1–2. All mobile units and theNOC belong to the same AS. The TGAN may have multiple connections to the allied WANfor redundancy and load sharing.Allied WANNOC#1NOC#2Mobile#1RF CommunicationsMobile#4Mobile#2 Mobile#3Single-AS TGANFigure 1-2 Single-AS TGANMULTIPLE AS TGAN TOPOLOGY111. A nation may set up its own AS within a TGAN. Each AS will contain a group ofmobile units as illustrated in Figure 1–3. Each mobile unit will have peer-to-peer connectionsto other mobile units; these connections may be via any communications path but are typicallyvia tactical circuits such as HF/UHF. Some of the mobile units may have connectivity back tothe Allied WAN via a national node or NOC. When this connectivity is achieved, the NOCforms part of the AS. Communication between the mobile unit and the NOC is typically done1-3UNCLASSIFIEDOriginal