Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Improved Layer 2 Protocol
open-in-new
<h2 id="il2p-specification">IL2P Specification</h2> <p>The IL2P draft specification v0.6<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> was published via the <a href="http://tarpn.net/t/il2p/il2p.html">Terrestrial Amateur Radio Packet Network (TARPN)</a> on March 16, 2024. </p><p>As of version 0.6, It added Trailing CRC description. Removed Weak Signal Extensions. Corrected description of block scrambling. Removed reference to Baseline FEC level. Added BPSK and QPSK symbol maps. Updated example encoded packets. Minor edits for readability. </p> <h2 id="implementations">Implementations</h2> <p>IL2P was first implemented in the closed source and proprietary ninoTNC<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> to solve for lossy network links due to low <a href="/facts/Signal-to-noise_ratio/qohClhyG">Signal-to-noise ratio</a> or weak <a href="/facts/Signal_strength_in_telecommunications/7DwVuERF">signal strength</a>. </p><p>The specification itself outlines several design goals including: </p> <ul><li><a href="/facts/Error_correction_code/cLUTUJrA">Forward error correction</a></li> <li>Eliminating <a href="/facts/Bit-stuffing/y8UX3vI7">bit-stuffing</a></li> <li>Streamlining the <a href="/facts/AX.25/7HlnxQwA">AX.25</a> header format</li> <li>Improved packet detection in the absence of Decode (DCD) and for open-<a href="/facts/Squelch/wuhD7r3T">squelch</a> receive</li> <li>Produce a bitstream suitable for modulation on various <a href="/facts/Physical_layer/WuATCrVw">physical layers</a></li> <li>Avoid bit-error-amplifying methods (<a href="/facts/Differential_encoding/AquYPwpu">differential encoding</a> and free-running <a href="/facts/Linear-feedback_shift_register/22pktBbX">LFSRs</a>)</li> <li>Increase efficiency and simplicity over <a href="/facts/FX.25_Forward_Error_Correction/PXgFX3JV">FX.25 Forward Error Correction</a></li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="http://ncpacket.net/north_carolina_packet_radio_network.html">NCpacket group</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"IL2P protocol description" (PDF). tarpn.net. Retrieved 2024-04-27. <a href="https://tarpn.net/t/il2p/il2p-specification_draft_v0-6.pdf" target="_blank">https://tarpn.net/t/il2p/il2p-specification_draft_v0-6.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"TARPN -- NinoTNC info for Builders". tarpn.net. Retrieved 2020-01-14. <a href="http://tarpn.net/t/nino-tnc/nino-tnc.html" target="_blank">http://tarpn.net/t/nino-tnc/nino-tnc.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>