OTM nr.m consists of up to n " multiplexed channels and does not support non-channel-related overhead. The letter "r" indicates a decrease in functionality.
Which of the following is the electrical layer cost of OTN? (Multiple choice).
The number of ODU2e signals multiplexed into the ODU3 signal is the same as the number of ODU2 signals multiplexed into the ODU3 signal.
TU-AIS is often encountered during network maintenance. Which of the following alerts can trigger a TU-AIS alert? (Multiple choice).
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) □
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.
OChr means the use of electrical monitoring technology.
Which of the following alerts does not trigger an AU-AIS alert?
The1310nm and 1550nm transmission windows are low loss windows. In DWDM systems, only the 1560m transfer window is used. Which of the following is the main cause?
Which of the following is the steps to multiplex a low-speed service into a high-speed SDH service? (Multiple choice).
The receiver performs a BIP-8 check on unscrambled STM-16 frames. If the BIP8 check result XOR·∶, the value of the B1 byte contained in the next STM16 ring is 10001100, which indicates STM-16 There is a () bit False block in the axis.
If a network port that supports autonegotiation is connected to a network port that does not support autonegotiation, you can interconnect in both half-duplex and full-duplex modes.
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.
When configuring VLAN-based service types, which of the following features must be enabled on the port?
Which of the following are the service board types for MSTP devices? (Multiple choice).
When performing fiber cut-off test on an ordinary MSP ring, which of the following alarms will be reported? (Multiple choice).
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).
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
The difference between dispersion compensation fibers and ordinary optical fibers is that the dispersion compensation fibers have a negative dispersion coefficient at ().
Fiber loss includes bending loss, absorption loss and scattering loss.
For MSPs, you need to set the MSP protocol ID for each NE. To ensure that each ID is unique, it is recommended to set the MSP protocol ID to the value that is compatible with the network element ID.
During service configuration, which of the following service levels cannot be selected?
Measure the False correction capability of fec with encoded gain. Which of the following statements about the coding gain is incorrect?
Which of the following is not the advantage of WDM?
The refractive index n1 of the fiber core must be the Q of the cladding refractive Mo n2, which is a necessary condition for transmitting the optical signal in the optical fiber.
Which of the following is not a nonlinear effect?
The STAT indicator of the SDH board flashes red, lights up for 100ms, and turns off for 100ms. Which of the following means the state of the metric?
Which of the following statements about the clock source are incorrect?
SL64 board is available for OSN 2500.
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?
Which of the following is the meaning of SFD in the Ethernet frame structure?
When using a script to back up U2000 data, the backup speed is fast because the backup file is small.
When the U2000 is synchronized, the same network metadata as the U2000 is not uploaded to the U2000, and the data that exists on the U200 but does not exist on the network element is deleted.
The device IP address of the gateway element and the non-gateway element must be set in the same network segment.
Which of the following statements about basic LCAS functionality are correct? (Multiple choice).
The interval between two adjacent pointer alignment events is at least () frames.
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?
Which of the following maintenance signals is transmitted from the downstream site to the upstream site of the OTN?
Which of the following statements regarding the protection of the cross-connecting plate 1+1 is correct? (Multiple choice).
QinQ technology can be used when multiple users need to share the same VCTRUK and use the same VLAN ID.
What of the following operations may interrupt the network element service? (Multiple choice).
Which of the following device domains can be managed by U2000? (Multiple choice).
On OSN Series transmission devices, ethernet ports cannot access tagged and untagged frames at the same time
For (on-premises) HA solutions where active and standby servers are deployed in the same location, which of the following platforms can be deployed? (Multiple choice).
The OTN signal has a fixed pad period, the same frame period as the SDH signal.
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.
The index is used to folio and delineate the starting position of VC-n in the corresponding AU or TU frame so that the receiving end can correctly remove the corresponding VC from the STM-N The VC and C packages are then separated into separate low-rate signals, such as PDH That is; Low-rate branch signals can be discarded directly from the STM-N signal
The following is the frame structure of the STM-16?
Which of the following is the multiplexing method of SDH?
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.
Compared with dense wavelength division multiplexing (DWDM) systems, crude glass division multiplexing (CWDM) systems provide a certain amount of glass length and transmission distance within (kmkm), which greatly reduces system cost and has strong flexibility
The MAC loopback and PHY loopback are used for fault location. When the MAC loopback is set to in loop, the PHY loopback can be set according to the actual situation.
When the J1 byte does not match, an alarm () is reported and the service may be interrupted.
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.
When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)
Which overhead below 112 is not ODUk overhead?
SES: There are 5% or more of the False blocks or at least one defect (OCI/AIS/LCK/IAE/LTC/TIM/PLM) in one second.
Which of the following technologies is the main difference between an open DWDM system and an integrated DWDM system?
The value of the MFAS byte increases with the sequence number of the OTUk/ODUK base frame and includes the most () base frames.
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