单项选择题
A. J0 errors detected in a in a specified interval
B. errors detected in a given Errored Seconds （ES）
C. errors detected in a given Severely Errored Seconds （SES）
D. errors the encryption algorithm detects in a specified interval
E. Bit Interleaved Parity （BIP） errors detected in a specified interval
多项选择题 Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications. What are two possible sources of trouble shown in the system？（）
多项选择题 Whataretwoimportantconsiderationswhenusing2-or4-channel15216OADMs？（）
单项选择题 Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux （left side） composite output and the ONS 15216 Demux （right side） composite input， with the optical values given in the exhibit？ （Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux/Demux and ignore power penalties or extra margin.） （）