Which three timing modes are supported on the ONS 15454 shelf？ （）

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.

单项选择题You are provisioning an E-1 circuit on an ONS 15454 SNCP configuration and XC-VXL-10G card.  How many total ports are used within the Low-Order matrix at the source node？（）

A. 0
B. 1
C. 2
D. 3
E. 5

多项选择题Whataretwocharacteristicsofdual-ringinterconnectinSDHnetworks？（）

A. It protects signals against node failures between rings.
B. It protects signals against node failure within a single ring.
C. It allows for traffic to be preempted when a ring switch occurs.
D. Traffic can be dropped and continued at interconnecting nodes.
E. It protects preemptible traffic from being dropped when a ring switch occurs.