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meta signalling

Meta-signalling is signalling used in ATM/B-ISDN networks to set up and tear down the signalling channels for the various connections. Similar to ISDN, the signaling in B-ISDN takes place in separate user channels.

Since ATM and B-ISDN support considerably more services and transmission parameters than classical ISDN, correspondingly more signaling processes are required. The signaling known from the D channel has therefore been further developed and exhibits considerably increased flexibility.

The signalling channels are not fixed in B-ISDN, but are set up as required by so-called meta-signalling. This is what makes connection types such as point-to-multipoint or multipoint-to-multipoint possible in the first place. Meta-signalling, a type of signalling channel signalling, was defined by the International Telecommunication Union (ITU) under Q.21220. With this signaling, all commands are placed in the ATM cell and sent over a reserved ATM channel.

The meta-signalling performs three tasks: the establishment, the de-establishment and the verification of the signalling channels. The Q.2931 signaling protocol only becomes active after the connection has been established via a virtual channel (VC) by the meta signaling.

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Englisch: meta signalling
Updated at: 12.11.2020
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