Standards and Protocols
Global standards for ALE are based on the original US MIL-STD 188-141A and FED-1045, known as 2nd Generation (2G) ALE. 2G ALE uses non-synchronised scanning of channels, and it takes several seconds to half a minute to repeatedly scan through an entire list of channels looking for calls. Thus it requires sufficient duration of transmission time for calls to connect or link with another station that is unsynchronised with its calling signal. The vast majority of ALE systems in use in the world at the present time are 2G ALE.
Read more about this topic: Automatic Link Establishment
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