The FA have separated out suspensions from the various individual competitions for the forthcoming season
It's partly described at the end of this document - I assume the Southern League will produce a specific guide in due course.
http://www.thefa.com/news/2018/jul/31/r ... ea-2018-19
The first part of the document is quite amusing - I wonder how strictly it will get applied, and whether it will be carried down to Southern League level - again we'll have to await guidance from the league.
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