18.2.10 Example scripts

Example scripts can be found in the ~ns/tcl/ex directory, including:

• sat-mixed.tcl A simulation with a mixture of polar and geostationary satellites.
• sat-wired.tcl Similar to the previous script, but shows how to connect wired nodes to a satellite simulation.
• sat-repeater.tcl Demonstrates the use of a simple bent-pipe geostationary satellite, and also error models.
• sat-aloha.tcl Simulates one hundred terminals in a mesh-VSAT configuration using an unslotted Aloha MAC protocol with a ``bent-pipe'' geostationary satellite. Terminals listen to their own transmissions (after a delay), and if they do not successfully receive their own packet within a timeout interval, they perform exponential backoff and then retransmit the packet. Three variants exist: basic, basic_tracing, and poisson. These variants are described further in the header comments of the script.
• sat-iridium.tcl Simulates a broadband LEO constellation with parameters similar to that of the Iridium constellation (with supporting scripts sat-iridium-links.tcl, sat-iridium-linkswithcross.tcl, and sat-iridium-nodes.tcl).
• sat-teledesic.tcl Simulates a broadband LEO constellation with parameters similar to those proposed for the 288 satellite Teledesic constellation (with supporting scripts sat-teledesic-links.tcl and sat-teledesic-nodes.tcl).

In addition, there is a test suite script that tries to exercise a lot of features simultaneously, it can be found at ~ns/tcl/test/test-suite-sat.tcl.