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Each LU6.2 session has a designated polarity indicating which LU is the contention winner. This polarity can be negotiated during the session BIND phase but is then fixed for the session.
The LU designated as contention winner controls conversation allocation activity for the connection. It has the right to initiate conversations at any time without notifying the LU at the other end. Conversely, the LU designated as contention loser must request permission from the contention winner LU before it can start a conversation on that session.
For a parallel session connection the typical configuration is to support enough contention winner sessions in each direction to service concurrent demand for conversation initiation from each LU of the connection.
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