What is one of the primary overhead fields associated with the Optical Payload Unit (OPU)?()
- A、path monitoring
- B、tandem connection monitoring activation deactivation (TCM ACT)
- C、Payload Structure Identifier (PSI)
- D、multiframe alignment signal (MFAS)
- E、section monitoring
正确答案:C
答案解析:有

微信扫一扫手机做题