In mode differed (or mode Blind and Forward ), a Commutateur waits completely to have received and have analyzed a package of Donnée S on one of its ports of entry to begin its retransmission on one or more its output ports.

This mode imposes the setting in Buffer memory of the totality of the package and delays the retransmission of the duration of reception of the package, but guarantees the sending of a complete package and with the checked integrity.

That implies also a Délai of commutation.