The exercise command (tools>perform>aps>exercise) is only supported in 1+1 APS bidirectional mode. The Exercise command exercises the protection line by sending an exercise request over the protection line to the far end and expecting a reverse request response back. The switch is not completed during the exercise routine. Refer to the 7705 SAR OAM and Diagnostics Guide, ‟Tools”, for information on the APS exercise command.