Computer mediated communication is unique in any teaching perspective. It makes it accessible at any time and place. Also, communication at different places and time zones becomes convenient.
The learning activities that could be implemented in a synchronous environment providing activities/tutorials and have the discussion in the classroom. Whereas, asynchronous environment requires teachers interaction with the students at different timing. Making use of online learning especially moodle where the teacher uploads the relevant document and the students attempt them and submit at a given due date.
Strategies that could maintain teaching presence making yourself vocal, confident and also give clear and direct instructions.