The Improved Layer 2 Protocol (IL2P) was created by Nino Carrillo, KK4HEJ, based on AX.25 version 2.0 and implements Reed Solomon Forward Error Correction for greater accuracy and throughput than either AX.25 or FX.25. Specifically, in order to achieve greater stability on link speeds higher than 1200 baud.
IL2P can be used with a variety of modulation methods including AFSK and GFSK. The direwolf software TNC contains the first open source implementation of the protocol.
The IL2P draft specification v0.5[1] was published via the Terrestrial Amateur Radio Packet Network (TARPN) on June 10, 2022.
As of version 0.5, the Weak-Signal-Extensions were added which adds several features to the protocols, intended primarily for SSB links. The automatic ID transmission for the FM/1200-baud and faster modes is still in place, but is not enabled if these lower speed weak-signal SSB modes are selected.
Implementationsedit
IL2P was first implemented in the closed source and proprietary ninoTNC[2] to solve for lossy network links due to low Signal-to-noise ratio or weak signal strength.
The specification itself outlines several design goals including:
^"TARPN -- NinoTNC info for Builders". tarpn.net. Retrieved 2020-01-14.
April 15, 2024
improved, layer, protocol, il2p, data, link, layer, protocol, originally, derived, from, layer, protocol, suite, designed, amateur, radio, operators, used, exclusively, amateur, packet, radio, networks, il2p, establishes, link, layer, connections, transferring. IL2P Improved Layer 2 Protocol is a data link layer protocol originally derived from layer 2 of the X 25 protocol suite and designed for use by amateur radio operators It is used exclusively on amateur packet radio networks IL2P establishes link layer connections transferring data encapsulated in frames between nodes and detecting errors introduced by the communications channel The Improved Layer 2 Protocol IL2P was created by Nino Carrillo KK4HEJ based on AX 25 version 2 0 and implements Reed Solomon Forward Error Correction for greater accuracy and throughput than either AX 25 or FX 25 Specifically in order to achieve greater stability on link speeds higher than 1200 baud IL2P can be used with a variety of modulation methods including AFSK and GFSK The direwolf software TNC contains the first open source implementation of the protocol Contents 1 IL2P Specification 2 Implementations 3 See also 4 ReferencesIL2P Specification editThe IL2P draft specification v0 5 1 was published via the Terrestrial Amateur Radio Packet Network TARPN on June 10 2022 As of version 0 5 the Weak Signal Extensions were added which adds several features to the protocols intended primarily for SSB links The automatic ID transmission for the FM 1200 baud and faster modes is still in place but is not enabled if these lower speed weak signal SSB modes are selected Implementations editIL2P was first implemented in the closed source and proprietary ninoTNC 2 to solve for lossy network links due to low Signal to noise ratio or weak signal strength The specification itself outlines several design goals including Forward error correction Eliminating bit stuffing Streamlining the AX 25 header format Improved packet detection in the absence of Decode DCD and for open squelch receive Produce a bitstream suitable for modulation on various physical layers Avoid bit error amplifying methods differential encoding and free running LFSRs Increase efficiency and simplicity over FX 25 Forward Error CorrectionSee also editNCpacket groupReferences edit IL2P protocol description PDF tarpn net Retrieved 2022 06 15 TARPN NinoTNC info for Builders tarpn net Retrieved 2020 01 14 Retrieved from https en wikipedia org w index php title Improved Layer 2 Protocol amp oldid 1215687125, wikipedia, wiki, book, books, library,
