If no bit error test is performed on a optical channel for 10 minutes, the local end uses the SDH analyzer to connect to the client-side port on the OTU board, the client-side port on the opposite OTU board need to be self-looped by a fiber. In the case of self-loop, a fixed attenuator must be added.

• A.True
• B.False

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Which of the following description is wrong about the content of the formula for calculating the maximum line rate (N=Ratc/((L+7+1+M)x8))?

• A.Rate indicates the line rate of the physical layer. If the device port is FE, then Rate=100Mbit/s.
• B.M is the frame gap, and the minimum IFG (minimum frame gap) is 8 bytes.
• C."8" outside the brackets is 1 Byte containing 8 Bits
• D.L is in standard Ethernet frame length with a minimum value of 64Bytes

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In the non-aggregated OTU processing SDH standard signal scenario, both A and B are WDM stations, and the R_Los alarm is detected on the client side of the OTU of the A station. After the alarm is processed on the WDM side of the OTU, the client side of the downstream B station detects and reports the REM_SF alarm, and the B station transmits the signal to the downstream client device and reports the R_LOS alarm to the client device.

• A.FALSE
• B.TRUE

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The following description of the 1+1 protection in the board, the correct ones are: (Multiple Choice)

• A.In-board 1+1 protection can be applied to chain networking and ring networking.
• B.The 1+1 protection on the board can protect the OTU board.
• C.Set the OTU as the detection unit, and the electrical layer alarms such as OTUk_LOF and OTUK_LOM will also trigger the switching.
• D.For OSN 1800 devices, you can use the OTU with dual-selection to protect your business.

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Which particles can be cross-scheduled for the cross-board of the OSN 8800 device? (Multiple choice)

• A.OPU2
• B.ODUO
• C.ODU2
• D.ODUflex

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