You are provisioning an E-1 circuit on an ONS 15454 MS-SPRing configuration and XC-VXL-10G card. Each VC-12 connection must also terminate via the VC-3 matrix.
 How many VC-3 ports remain after this circuit is created， assuming no other circuits？（）

单项选择题Whatisthedifferencebetween1+1and1：1protectionswitching？（）

A. 1+1 is based on APS， while 1：1 is based on IPS.
B. 1：1 is used in SNCP switching， while 1+1 is used in MS-SPRing switching.
C. 1+1 sends signals on Working and Protect paths， while 1：1 sends signals only on Working path.
D. 1+1 sends signals on Working path ONLY， while 1：1 sends signals on both Working and Protect paths.

单项选择题WithR4.0，howmanytotalDCC-RtunnelconnectionscaneachONS15454supportusingtheTCC+card？（）

A. 10
B. 32
C. 64
D. 84
E. 96

单项选择题WhichtimingmodeismostappropriateforanONS15454thathaslostitsBITS-1andopticalreferences？（）

A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing