For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （）

多项选择题Click the Exhibit button. Within an ONS 15454， you are provisioning a circuit on an unprotected SNCP ring. In the exhibit，  which two must you configure？（）

A. revertive
B. circuit size
C. circuit type
D. bidirectional
E. protected drops
F. Switch on PDI-P

多项选择题WhichthreetimingmodesaresupportedontheONS15454shelf？（）

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

单项选择题TheML-seriesEthernetcardontheONS15454providesupto（）activeQ-in-Qinstancespercard.

A. 512
B. 255
C. 1024
D. 4096

单项选择题You are installing a Cisco ONS 15454 SDH in a service provider site. An E3 cable is being connected to a digital cross-connect system.  What is the maximum distance allowed between the two？（）

A. 225 ft
B. 450 ft
C. 655 ft
D. 900 ft

单项选择题WhyisanSTM-12F-MS-SPRingNOTfeasible？（）

A. An equal amount of working and protect bandwidth is required.
B. DCC bandwidth is not large enough to handle K1/K2 processing.
C. Switch times would exceed 50 ms for an STM-1 MS-SPRing ring.
D. There is not enough bandwidth in an STM-1 ring to justify MS-SPRing protection.