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signalling unit (SU)

A Signalling Unit (SU) is an SS7 message

in SS7 signalling. There are three different types of signalling units: The Fill-in Signaling Unit, Fill-in Signal Unit (SS7), the Link Status

Signal Unit(LSSU), and the Message

Signaling Unit,Message

Signal Unit(MSU).

The Fill-in Signaling Unit works with fill characters for error detection and synchronization,

the Link Status Signal Unit is used to check and display the link status, and the Message Signal Unit is used for link control.

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Englisch: signalling unit - SU
Updated at: 22.06.2011
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