单项选择题
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？（）
多项选择题 Whataretwocharacteristicsofdual-ringinterconnectinSDHnetworks？（）
单项选择题 A customer would like to create a 1：1 protection group with a DS3Ni-12 card. Where should it be placed in the chassis？（）