Is the following statement about the delay test wrong? ()

• A.The time from the first bit of the data frame to the beginning of the time until the first bit of the data frame appears on the output port, the time difference between the two is the delay of the bit forwarding device
• B.In the time delay test, the frame rate can be greater than the throughput
• C.The last bit of the data frame enters the device to start timing, and the first bit of the data frame appears at the end of the output port. The time difference between the two is the delay of the store and forward device.
• D.Delay is divided into the delay of storage and forwarding equipment and the delay of bit forwarding equipment. Huawei equipment is all storage and forwarding equipment.

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A certain system is configured with SOM, only the optical power information is in the query spectrum analysis data, and the OSNR is displayed as "---". The OSNR is abnormal at this time, the possible reason is ()?

• A.After the networking changes, the SOM function is not reconfigured
• B.Scanning spectra of OMCA/MCA4/MCA8 boards are inconsistent
• C.The OMS segment is not correctly configured or the OMS segment is configured with a board not in place
• D.Abnormal communication between network elements
• E.There is a single-board optical cross-connection in the Och path or the Och is not created

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A certain network has 2250 equivalent network elements of SDH series, 1000 equivalent network elements of WDM series, and 1000 equivalent network elements of router series. The customer purchased SDH end-to-end, WDM end-to-end, Corba northbound and other value-added functions.
Regarding this network management deployment plan, the error is

• A.Due to the purchase of SDH end-to-end and WDM end-to-end value-added features, it is necessary to install the SDH network management subsystem and OTN network management subsystem; as the Corba northbound interface is purchased, the Corba northbound subsystem needs to be installed
• B.The maximum management capability of the SDH network element manager subsystem is 2500 equivalent network elements, so 1 SDH network element manager instance needs to be deployed; the maximum management capability of the router network element manager subsystem is 5000 equivalent network elements Yuan, so you need to deploy 1 instance of the router network element manager
• C.Since there are SDH, OTN and router series network elements, it is necessary to install SDH network element manager, OTN network element manager and router network element manager subsystem
• D.If the OTN series network element is OSN 6800+OSN 8800T32 (without ASON, the ratio of the two is 1: 1), where OSN 6800 is the master subrack and OSN 8800 is the slave subrack. And each master subrack only carries one slave subrack. Then the actual number of OSN 8800 physical network elements is 125

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Drift refers to the long-term phase change of the digital signal relative to the standard signal less than 10 Hz, and jitter refers to the short-term phase change of the digital signal relative to the standard signal greater than 10 Hz.

• A.TRUE
• B.FALSE

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Which of the following abnormal conditions will trigger the TPS protection switching of the PTN equipment?

• A.The work processing board is offline
• B.The business interface of the working interface board is loose
• C.Business interruption caused by non-hardware reasons on the work processing board
• D.The working interface board is offline

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