In the frame structure of the SDH signal, there are large overhead bytes for operation, management, and maintenance (OAM). Overhead bytes account for all bits () of the entire frame and greatly enhance the monitoring capabilities of the network.
Which of the following is the main networking type of a transmission network?
Which of the following is not the northbound interface provided by the U2000?
The last 256 columns in the OTN frame structure are the FEC regions for forward False correction.
When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)
The clock unit can only access the external clock source as the timing signal source of the system through the external clock interface. In addition; It can also output a processed clock and provide a clock source for other devices that need timing.
When performing fiber cut-off test on an ordinary MSP ring, which of the following alarms will be reported? (Multiple choice).
When the number of block errors detected by the B2 byte received at the recerve end is returned to the transmit end through the Ml byte, which of the following alarms or performance events are reported at the transmit end?
Which of the following sites support service adding/dropping?
The Raman amplifer uses which of the following effects?
Which overhead below 112 is not ODUk overhead?
Which of the following modulation technologies has the best performance in terms of wavelength stability?
Automatic Laser Shutdown (ALS): When no optical signal is received, the ALS function automatically turns off the corresponding optical module. This feature protects field maintenance personnel.
Which of the following is not the advantage of WDM?
When the J1 byte does not match, an alarm () is reported and the service may be interrupted.
Which of the following alerts does not trigger an AU-AIS alert?
Which of the following statements regarding multiplexing partial remote False indication (MS-REI) is correct?
(1) B2 bytes indicate the transmission channel.
(2) The M1 byte represents the transmission channel
(3) THE MS-REl is sent from the receiver to the source.
(4) MS-REI is transmitted from the source to the receiver.
(5) Indicates the number of bit Falses detected by the receiver after receiving the MS signal.
OChr means the use of electrical monitoring technology.
The TAG attribute cannot be set for the internal port VCTRUNK of the single board on the NMS.
In the colored scenario, the TM20fTD20 board can be used to add/drop wavelengths.
On OSN Series transmission devices, ethernet ports cannot access tagged and untagged frames at the same time
WDM transmits optical signals multiplexed at multiple rates (wavelengths) through a single optical fiber, and the digital signals carried by these optical signals must have the same rate and data format
The interval between two adjacent pointer alignment events is at least () frames.
Which of the following is the meaning of "L" in the optical module parameter "L-64.2"
NE A and NE B are adjacent NE
If B3 and low-order Falses occur in the A->B direction, and B1, B2, B3, and low-order Falses occur in the B->A direction, it is caused by Which of the following performance events does NEA report? (Multiple choice).
After signals are transmitted for a certain distance in a WDM system, the optical signal-to-noise ratio (OSNR) at the receive end decreases to a certain extent. Which of the following Is the main cause?
In the case of a 1+1 linear MSP, which of the following switching modes does not require the APS protection protocol full (multiple choice) to be enabled
Optical monitoring channel is used for monitoring of WDM optical transmission systems. In the UU-T recommendation, it is preferable to use a 1510 nm wavelength of the a ") rate.
The scope of management of OMSn is the path from the input optical port on the multiplexer unit of the sending site to the output optical port on the multiplexer unit of the receiving site, called the optical multiplexing segment (OMS) path.
Which of the following are key technologies in a WDM system?
Which factors determine the optical signal-to-noise ratio (OSNR) of the receiving end to a certain extent After the signal transmission in the WOM system is transmitted over a certain distance, the "oSNR" of the receiving end of the optical signal-to-noise ratio is reduced to a certain extent. Which of the following is the main cause?
When configuring LMSP, there are two switching modes: single-ended switching and double-ended switching. Single-ended switching does not require the protection protocol to be enabled.
OSN1500/2500/3500/7500 supports DC and AC power inputs.
Bait-doped fiber amplifiers (EDFAs) are a key component of the new generation of optical communication systems. Which of the following is the feature of EDFA? Multiple Choice) □
According to the formula "ODUk rate = 239/(239k) x STMN frame rate", ODU4 The rate is equal to 239/235× STMN frame rate.
Which of the following are the service board types for MSTP devices? (Multiple choice).
RSOH, MSOH, HPOH and LPOH implement the monitoring function in descending order of the monitoring fan country.
LCK insertion takes precedence over AIS insertion. That is, if the user configures LCK insertion and the conditions for automatic AS insertion are met, the LCK is inserted.
Which of the following layers define the protocols that control the network layer? The protocol for this layer applies to logical links, i.e. end-to-end connectivity between two devices.
The rate of STM-0 is 51.84 Mbtt/s.
Which of the following service types are supported by MS-OTN devices?
Which of the following clock operating modes supports the ITU-T G.781 standard? (Multiple choice).
The backplane has two 48V power cords, and each board gets two -48V power supplies from the backplane. After combining the power supply via diodes, the various voltages required for each component are obtained by means of a DC/DC power module and a linear mane swap.
Which of the following is not a basic component of a WDM system?
Are the following statements regarding the definition of SDH correct?
In WDM systems, it is ideal to use a dielectric thin film filter (TFF) when using less than () wavelengths.
In the OTN standard system, which of the following protocols defines optical transport network interfaces?
The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots
Which of the following statements about an Ethernet switch is incorrect?
Which of the following is not an EVPLAN feature?
When setting up LCAS mode, follow these principles:
1. If both ends of the device are Huawei devices, please set it to "Standard Mode".
2. If a Huawei device is interconnected with a third-party device, set the interconnect device to the same mode according to the mode supported by the third-party device.
When the sender detects that the b6-b8 of the K2 byte is 110, it means that the sender has reported an alarm ().
Configuring the EPLAN service as a ring is not recommended. If the EPLAN service is configured as a ring network, the STP protocol must be enabled on the network to prevent broadcast storms.
An unprotected chain consists of four net elements; ME1, NE2, NE3 and NE4.
Create an end-to-end VC4 path NE1-NE4 and add NE5 between NE2 and NE3 for capacity expansion.
The original configuration remains unchanged and no services are configured on the NE5.
In this case, the unprotected chain becomes NE1-NE2-NE5NE3-NE4, how many VC4 paths can be searched?
On the NMS system, the network element performance monitoring time is set to () minutes and () hours.
Which of the following bridges are used to forward data based on the MAC address and VLAN ID carried in the data?
When the ACT indicator of the SDH board is off, it means that the board has a hardware failure and cannot be used.
Which of the following statements about OTN advantages is false?
Which of the following statements about the MST functional module is correct? (Multiple choice).
The OTN signal has a fixed pad period, the same frame period as the SDH signal.
Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is true?
After a user adjusts service bandwidth, the NCE Controller delivers the new bandwidth to devices and adjusts the CIR and PIR of the service PW. During the adjustment, services are not interrupted.
Which of the following is the meaning of SFD in the Ethernet frame structure?
Linear MSP (LMSP) has two modes: 1+1 and 1:1. Additional services can only be configured for the protection channel in 1:1 mode of the LMSP.
Which of the following are device-level protection schemes for SDH products? (Multiple choice).
Single-fiber bidirectional WDM systems use only one optical fiber to transmit optical signals in both directions at the same time. Light signals in both directions should be arranged at different wavelengths.
Which of the following types of optical fibers has the zero-dispersion feature at 1310 nm?
Hitless protection switching (HPS) provides the dual fed and selective receiving function for fiber differential protection services and aligns the end-to-end latencies of the working and protection paths, improving service reliability.
Which of the following is the frame indicated by the VC-4 J1 byte by the AU pointer of the current frame?
When a bit False is detected in B2 bytes, which of the following alarms is reported by the peer?
After the U2000 sends configuration data to the network element, if the SCC single board authentication fails, the network element enters the installation state.
Which of the following alerts does not trigger an AU-AIS alert?
Forced switching, fiber switching, manual switching and motion switching are decreased in order of priority.
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