Which of the following statements about the access network are correct? (Multiple choice)

• A.Access network refers to all devices between the aggregation layer and the core layer
• B.Access network refers to all active and passive devices between the aggregation layer and the user terminal.
• C.Access network directly faces a large number of users and provides various services to users through various transmission media.
• D.Features of the access network: rich service interfaces, flexible access modes and wide coverage

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The CH220/CH221 compute node performs IO expansion on the basis of the CH121 compute node, and supports up to four PCIe cards in full-width slots.

• A.True
• B.False

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Which statement is correct about the working principle of the FTTx key technology PON?

• A.PON is the abbreviation of Passive Optical Network.
• B.The ONU completes the PON service forwarding and the interconnection of the upper layer network.
• C.SFU is a device directly connected to the upper layer network in the PON upper layer network.

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Regarding the MA5800 frame device, the signal cable hardware quality standard, which statements are correct? (Multiple Choice)

• A.The signal cable route is consistent with the engineering design file, which is convenient for maintenance and expansion.
• B.Signal cable can be damaged, broken, intermediate connector
• C.Signal cable should be tested for continuity on each line
• D.The signal cable plug is clean and undamaged, the plug made in the field is correctly standardized, and the plug connection is correct and reliable.

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Which of the following is not included in the hard-loaded standard procedure of the MA5800?

• A.Installing and tying the fiber
• B.Software commissioning
• C.Install the power and ground wires
• D.Install the machine frame

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