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link level protocol (LLP)

The Link LevelProtocol (LLP) is an asynchronous backup protocol (BSC variant with BCC checksum) in Datex-J for analogdata transmission (text mode) from the Datex-J exchange to the user's terminal equipment (software decoder). There is no secured transmission in the opposite direction. For two-way transmission security on switched modem connections(a/b interface), the Datex-J provides the well-known protocols ITU-T V.42 and Microcom Networking Protocol (MNP) in version MNP 4. For system access via the ISDN connection, transmission security is provided using the familiar HDLC procedure.

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Englisch: link level protocol - LLP
Updated at: 11.10.2013
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Translations: DE