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The commands that switch the logical communications channels ontodifferent physical time slots are issued only by the host exchange. The accessnetwork can only request a switch-over and acknowledge commands from theexchange. Either side can reject a switch-over, but the message to do so mustindicate the reason for the rejection. Rejections, like all other switch-overmessages, must also identify a physical communications time slot. All switchovermessages are also numbered so that it is possible to identify the two copiesof the messages that are sent over the two physical time slots used by theprotection protocol.
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