NO.46 Which of the following description of the Optix OSN 9800 sub-rack is correct? (Multiple choice)

• A. When the OSN 9800 Universal Platform Sub-rack is used as a slave sub-rack, the main control board must be placed.
• B. The OSN 9800 U16 sub-rack has a total of 16 service slots. These slots have the same capacity and support up to 400 bit/s ODUk crossover in a single slot.
• C. In the OSN 980 0U32 sub-rack, IU70 is the primary CTU and IU78 is the standby CTU.
• D. The service board can be inserted into the IU18 slot only when the OSN 9800 P18 is used as the slave sub-rack.

NO.47 The optical monitoring channel wavelength used by the ST2 board is: (Multiple choice)

• A. 1491nm
• B. 1471nm
• C. 1510nm
• D. 1511nm

NO.48 Which of the following description are wrong about the path method to create a Client path?

• A. Select the "Activate" checkbox. After the path is successfully created, it will be delivered to the NE layer. Otherwise, the path configuration text will only be saved on the network management side.
• B. Create a client service path by using the path method. After the creation, the optical layer OCh path is automatically generated to reduce the secondary teaching of the path creation.
• C. The creation or search of a new path must be possible if its upper service layer path already exists.
• D. If the route to be automatically calculated is different from the planned path, you can set the "constrained node" or "must pass through the node" to perform routing constraints.

NO.49 Which of the following features does the EX40 add than X40?

• A. The number of combined waves is more
• B. Support light layer crossing
• C. Less occupied slots
• D. Support single channel optical power monitoring

NO.50 The following description of the PM_BIP8 related alarm, which is correct?

• A. The PM_BIP8_DEG alarm indicates the PM segment signal degradation alarm in the ODU layer.
• B. The PM_BIP8_SD alarm indicates the PM segment signal degradation alarm in the ODU layer.
• C. The PM_BIP8_OVER alarm indicates the PM segment error amount of the ODU layer is over-limit alarm.

NO.51 When configuring the Ethernet Layer 2 attribute, set the Default VLAN ID and VLAN Priority of the untagged frame when the TAG ID is set to Accese or Hybrid. The "VLAN priority" is set according to the QoS of the unified plan.

• A. TRUE
• B. FALSE

NO.52 Which of the following boards can be inserted on the OSN 9800 U64 subrack?

• A. TNV1N401
• B. TN54GS4
• C. TNF 5UNQ2
• D. TN18LSC

NO.53 The following description of the use of synchronous methods to create fiber optics, which is wrong?

• A. The fiber exists on the network management side and the network element side, and the fiber with the same information is not required to be created.
• B. If there is a fiber that is not created on the U2000 or a fiber that is not created on the network element, you need to synchronize or create it.
• C. The existence of a conflicting fiber does not affect the configuration of the path, so it can be ignored.
• D. Collision fiber refers to the fiber that is configured on the network element side and is inconsistent with the configuration on the network management side.

NO.54 Which of the following methods does the networking and application of NG WDM include? (Multiple choice)

• A. Point to point
• B. Ring
• C. Mesh
• D. Chain type

NO.55 The overhead ratio is a factor that affects the error correction capability of FEC technology. Generally, under the same FEC encoding/decoding algorithm, the higher the overhead ratio, the greater the net coding benefit.

• A. TRUE
• B. FALSE

NO.56 For ODUk SNCP protection, if the punch-through site is an electrical relay station, the SCP type is recommended to be configured as SC/I when configuring protection.

• A. TRUE
• B. FALSE

NO.57 The following description of the alarm, which is correct? (Multiple choice)

• A. OTUk-LOM: Multi-frame alignment signal abnormal alarm, multi-frame positioning processing continues the multi-frame out-of-synchronization (o0M) state for 3ms, generating OTUelom alarm.
• B. OTUKBDI: OTUk backwards indication alarm. When the signal detected by the SM segment fails, the value of the BDI byte is 1, and the alarm is reported.
• C. OTUKAIS: OTUK alarm indication signal, the AIS signal is transmitted downstream, indicating that the upstream detected signal is invalid.
• D. OTUK-TIM: The OTUK trace identifier is the TTI (Trail Trace Identifier) mismatch. This alarm is generated if the trace identifiers of the peer end and the local end do not match and the TIM detection is enabled during the control process. Compare the API (Access Point Identifiers) in the input signal with the desired API.

NO.58 Which of the following ROADN nodes are configured correct? (Multiple choice)

• A. WSMD9
• B. WSD9+RMU9
• C. WSM9+RDU9
• D. WSIM9+WSD9

NO.59 Which of the following plane technologies does the OS-OTN device incorporate? (Multiple Choice)

• A. PDH
• B. OTN
• C. SDH
• D. Grouping

NO.60 On the ROADM board, you need to configure the virtual optical layer service before the optical power is commissioned. Otherwise, the ROADM limit board blocks all wavelengths by default.

• A. TRUE
• B. FALSE