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
On a Layer 2 switching device, if the Ethernet port is an Access port, the port can only receive Ethernet frames without a VLAN tag or Ethernet frames with the same VLAN ID as the default VLAN ID of the port.
output networks require higher costs than belt networks, but provide a more reliable management channel.
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 basic requirement of the DWDM system in the light source?
Frame-Mapped GFP (GFPF> is a processing mode that targets data encoding blocks such as Fibre Channel and ESCON.
The rate of STM-1 is ()bit/s.
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 is the steps to multiplex a low-speed service into a high-speed SDH service? (Multiple choice).
SDH signals must be scrambled before they can be transmitted over optical fibers. Which of the following bytes is not scrambled? (Multiple choice).
STM-64 has an () AU pointer.
Which of the following is the maximum number of OSN3500 sub-racks that can be installed in a 2.2-meter cabinet?
U2000 can flexibly interconnect with different third-party network administrators through the Northbound Interface (NBI) and provide physical inventory and alarm information for the upper-layer network management.
The standard Ethernet frame length should not be less than 64 bytes Which of the following factors contribute to this limitation? (Multiple choice).
When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)
Establish Ethernet leased line service between HI (HQ) and H2 (branch) of enterprise H, and bind 5 in the corresponding VCTRUNK VC-12. When a VC-12 fails, the Ethernet dedicated line between H1 and H2 is interrupted. So, which of the following statements is true?
OChr means the use of electrical monitoring technology.
Which of the following statements regarding the sequence of signal flows between the SDH interface and the cross-connecting unit is correct?
Which of the following is the multiplexing method of SDH?
When using a script to back up U2000 data, the backup speed is fast because the backup file is small.
In a 2.5GMSP ring consisting of four MSTP sites, which of the following statements about alarm reports is correct when a protection switchover occurs?
Which of the following statements about the MSP ring is correct? (Multiple choice).
After the U2000 sends configuration data to the network element, if the SCC single board authentication fails, the network element enters the installation state.
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.
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.
Which of the following different types of ESC are divided according to the principles of implementation? (Multiple choice)
Some SNCP protection inversion conditions are default, such as AU-AIS and TU-AIS. Other conditions are optional, such as HP-TIM and HP-SLM. Optional conditions can be flexibly set according to the level of the costume.
Which of the following is the difference between an AU pointer and a TU pointer? (Multiple choice).
Which of the following is the VLAN classification method? (Multiple choice).
Which of the following technologies is the main difference between an open DWDM system and an integrated DWDM system?
According to ITU-T's recommendations, the requirement that the MSP switching time should be within 50ms is conditional. For example, the number of net elements on the entire ring network is less than 16.
Which of the following can be used as the central wavelength of the pump source in EDFA? (Multiple choice).
Which of the following is the feature of TCM overhead in ODUk signals?
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.
For alignment; Indicates the starting position of VC-n in the corresponding AU or TU frame. • This way: The receiver can correctly remove the corresponding VC from STM-N, and then The VC and C packages are separated into separate low-rate signals, such as PDH, which means that the low-rate path signal can be dropped directly from the STM-N signal.
Which of the following is the functional unit that provides a high-speed signal interface and processes the corresponding signal?
Which of the following is the frame indicated by the VC-4 J1 byte by the AU pointer of the current frame?
Which of the following is the meaning of "L" in the optical module parameter "L-64.2"
Which of the following is the default WTR time for MSP switching?
In Recommendation ITU-T G.692, the allowable channel frequencies are based on the reference frequency (), and the channel spacing can be 100 GHz, 50 GHz or 25 GHz.
When using a script to back up and restore network configuration data for the U2000, you can change the directory where the export file is saved.
By default, B2-EXC alerts are reported when the number of B2 bit Falses exceeds the () threshold.
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.
A PAUSE frames use reserved multicast addresses and are not forwarded by bridges or switches. In this way, the PAUSE frame does not generate any additional information.
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.
When configuring VLAN-based service types, which of the following features must be enabled on the port?
When the J1 byte does not match, an alarm () is reported and the service may be interrupted.
Which of the following is affected by changing the element ID of OSN3500 on NMS?
The last 256 columns in the OTN frame structure are the FEC regions for forward False correction.
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 northbound interface provided by the U2000?
What of the following operations may interrupt the network element service? (Multiple choice).
The number of bit False blocks on each VC4 channel is detected by B3 on the receiving side. At the same time, the information is sent back to the sender via Q, and HP-REI and HP-FEBBE report on the sender.
After configuring PDH on a per-net element basis, the full trace cannot be searched. Which of the following is a possible cause? (Multiple choice)
Which of the following is the functional unit that provides serial data for the interface and system associated with the orderwire phone?
The optical amplifier unit compensates for line losses and extends the transmission distance. Connecting multiple optical amplifier units in cascaded mode allows for extended transmission distances without following the system.
Which of the following bytes in the regenerator part overhead are associated with R-OOF and R-LOF? (Multiple Choices)
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.
The working mode of the port determines the flow control mode of the port.
When the operating mode is 100Mbit/s full duplex, one of the following flow control modes can be used