Click the Exhibit button. Which type of multiplexer is shown in the exhibit？（）
In order to avoid misconnections due to a failed node in an MS-SPRing， Alarm Indication Signals （AISs） are sent on every channel normally terminating in that node. What is the name of this process？（）
A customer would like to create a 1：1 protection group with a DS3Ni-12 card. Where should it be placed in the chassis？（）
