Write down the function of Primary-Secondary communication in line discipline.

Write down the function of Primary-Secondary communication in line discipline.

1. Poll method works with topologies where one device is designed as a Primary station and the other devices are Secondary stations
2. The primary device controls the link and the secondary device follow sits instruction
3. It is up to the primary to determine which device is allowed to use the channel at a given time.
4. The primary therefore is always the initiator of the a session
5. Whenever a multipoint link consists of a primary device and multiple secondary devices using a single TX line , all exchanges must be made through the primary device even when the ultimate destination is a secondary device