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Reference.org
Deterministic routing
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<p>In <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a>, deterministic routing is the advance determination of the routes between given pairs of nodes. Examples: </p> <ol><li>In a network where routing is controlled by a <a href="/facts/Telephone_switch/PaRpGm8I">telephone switch</a> or <a href="/facts/Network_switch/CnvmhNYT">network switch</a>, switching in which the routes between given pairs of nodes are pre-programmed, <i>i.e.,</i> are determined, in advance of <a href="/facts/Transmission_(telecommunications)/33zk8a0A">transmission</a>. The routes used to complete a given <a href="/facts/Telecommunication_circuit/DYF1dSRU">call</a> through a network are identified, in advance of transmission, in <a href="/facts/Routing/Ml6MVCaC">routing</a> tables maintained in each <a href="/facts/Network_switch/CnvmhNYT">switch</a> <a href="/facts/Database/VYcpkevb">database</a>. The tables assign the trunks that are to be used to reach each switch <a href="/facts/Code/CSntvnEo">code</a>, area code, and International Access Prefix (IAP), usually with one or two alternate routes.</li> <li>In a non-switched network, the routes used to send a given <a href="/facts/Message/zaUQGfQB">message</a> through the network are identified in advance in routing tables maintained in a database.</li></ol>