The pointer is used for alignment and indicates the start position of VC-n in the corresponding AU or TU frame. In this way, the receive end can correctly remove the corresponding VC from the STM-N, and then split the VC and C encapsulation to separate low-rate signals, such as PDH. That is, low-rate tributary signals can be directly dropped from the STM-N signal.
After the U2000 delivers configuration data to an NE, if the verification fails on the SCC board, the NE enters the installation state.
Which of the following bytes in the regenerator section overhead are associated with R-OOF and
Which of the following operations may interrupt NE services? (Multiple Choice)
Which of the following statements about the optical-layer interfaces OTM-n.m and OTM-nr.m of OTN is incorrect?
When the lower-order resources of a device are insufficient, which of the following measures can be taken? (Multiple Choice)
Which of the following overhead bytes needs to be processed at an electrical regeneration site?
Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?
Which of the following statements about the MST functional module are correct? (Multiple Choice)
In the system control unit, which of the following databases do not lose data after a power failure?
During the service configuration between two adjacent sites (NE1 and NE2), if VC4:1 and VC12:l-3 are used on the NEl's line board connected to NE2, the same VC4 and VC12 timeslots must be used on the NE2's line board connected to NE1.
Which of the following alarm/event dumping modes are supported by the U2000? (Multiple Choice)
When LMSP is configured, there are two switching modes: single-ended switching and dual-ended switching. The protection protocol does not need to be enabled for single-ended switching.
In the frame structure of SDH signals, there are abundant overhead bytes used for operation, administration, and maintenance (OAM). The overhead bytes account for ( ) of all bits in the entire frame and greatly enhance the monitoring functions of the network.
The receive end performs BIP-8 check for the unscrambled STM-16 frame. If the BIP-8 check result XOR the value of the B1 byte contained in the following STM-16 frame is 10001100, it indicates that () bit error blocks exist in the STM-16 frame.
Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?
WDM multiplexes the optical signals at multiple rates (wavelengths) over one fiber for transmission. The digital signals carried by these optical signals must have the same rate and data format.
The working mode of a port determines the flow control mode of the port. When the working mode is 100 Mbit/s full duplex, which of the following flow control modes can be used?
Which of the following is not the advantage of WDM?
The section overhead of STM-4 is () bytes/frame.
Which of the following is the meaning of SFD in the Ethernet frame structure?
Which of the following are the device-level protection schemes of SDH products? (Multiple Choice)