H31-311_V2.5 Exam Questions

EPL service uses the bandwidth on the line exclusively, which is very safe. It is suitable for dedicated line applications for VIP customers.

For 100G (112Gbit/s) signal, the actual data baud rate is only 28G baud.

On OSN series transmission equipment, the Ethernet port cannot access tagged frames and untagged frames at the same time.

When multiple users need to share the same VCTRUNK and use the same VLAN ID, QinQ technology can be used.

Arrayed Guided Grating (AWG) multiplexer/demultiplexer has the following advantages: short wavelength spacing, large channels and flat passband. It is suitable for ultra-high-speed...

The management scope of O MSn is the path from the input optical port on the multiplexer unit at the sending site to the output optical port on the demultiplexer unit at the receiv...

For OSN3500, there is a slot mapping relationship between the processing board and the interface board. The processing board in slot 1 is mapped to the interface board in slots 19-...

The pointer is used for alignment, indicating the starting position of the VC in the corresponding AU or TU. In this way, the corresponding VC can be correctly removed from the STM...

SL64 board can be used for OSN2500.

OTM nr.m consists of a maximum of "n" optical multiplexed channels and does not support non- channel related overhead. The letter "r" indicates reduced functionality.

Frame-Mapped GFP (GFP-F) is a processing mode for data encoding blocks (such as Fibre Channel and ESCON).

According to ITUT recommendations, the requirement that the MSP switching time should be within 50ms is conditional. For example, the number of network elements in the entire ring...

When setting the LCAS mode, please follow the following principles: 1. If the devices at both ends are Huawei devices, please set them to "Standard Mode" 2. If Huawei devices are i...

When the optical fiber between node A and node B is open, the RU on node A detects the OTS_LOS alarm and inserts the OTS_BDI alarm into node A. The RU on node A reports the OTS_BDI...

The last 256 columns in the OTN frame structure are the FEC area, which is used for forward error correction.

Automatic Laser Shutdown (ALS): When no optical signal is received, the ALS function automatically shuts down the corresponding optical module. This function protects on-site maint...

U2000 can flexibly interconnect with different third-party network management systems through the Northbound Interface (NBI) and provide physical inventory and alarm information to...

Output networks require higher costs than belt networks, but provide more reliable management channels.

PRBS can be used to test whether the SDH service is normal and whether the protection switching function is normal.

The frame period of OTN signal is fixed and the same as the frame period of SDH signal.

In case of SNCP, the line board selectively receives the service. Therefore, SNCP can protect the service on the line.

MAC loopback and PHY loopback are used for fault location. When MAC loopback is set to in loop, you can set PHY loopback according to the actual situation.

The backplane has two -48V power lines, and each board obtains two 48V power supplies from the backplane. After the power is combined through the diode, the various voltages requir...

RSOH, MSOH, HPOH and LPOH implement monitoring functions in descending order of monitoring range.

According to the formula "ODUk rate = 239/(239-k)*STM-N frame rate", the ODU4 rate is equal to 239/235xSTM-N frame rate.

Single-fiber bidirectional WDM system uses only one optical fiber to transmit optical signals in two directions at the same time. The optical signals in the two directions should b...

The number of ODU2e signals multiplexed into the ODU3 signal is the same as the number of ODU2 signals multiplexed into the ODU3 signal.

When using scripts to back up and restore the network configuration data of the U2000, you can change the directory where the exported files are saved.

The interval between two adjacent pointer alignment events is at least () frames.

Which of the following alarms are reported by the peer end when a bit error is detected in the B2 byte?

The optical monitoring channel is used for monitoring WDM optical transmission systems. In the UU-T proposal, it is preferred to use a () rate 1510nm wavelength.

The 1310nm and 1550nm transmission windows are low-loss windows. In a DWDM system, only the 1550nm transmission window is used. Which of the following is the main reason?

The number of bit error blocks on each VC4 channel is detected by B3 at the receiving end. At the same time, the information is sent back to the transmitting end via Q HP-REI and H...

Establish an Ethernet private line service between H (HQ) and H2 (branch) of the enterprise, and bind 5 VC-12s in the corresponding VCTRUNK. When one C-12 fails, the Ethernet priva...

In Recommendation ITU-TG692, the allowed signal frequencies are based on the reference frequency () and the channel spacing can be 100 GHz, 50 GHz or 25 GHz.

Which of the following overheads are not ODUk overheads?

The difference between dispersion-compensating fiber and ordinary optical fiber is that dispersion- compensating fiber has a negative dispersion coefficient at ().

The fiber core refractive index n1 must be () Q of the cladding refractive index n2, which is a necessary condition for transmitting optical signals in optical fibers.

STM-64 has () AU pointer.

EPL services use ports and bandwidth exclusively, and different users may need to share resources. Which of the following methods can be used to isolate user data?

The STAT indicator on the SDH board flashes red, on for 100ms and off for 100ms. Which of the following is the meaning of the indicator status?

Which of the following service levels cannot be selected during service configuration?

The error correction capability of FEC is measured by coding gain. Which of the following statements about coding gain is wrong?

Which of the following is not a condition for triggering multiplex section protection (MSP)?

When the rate of the SNCP ring composed of four OptiX OSN2500 devices is 2.5 Gbit/s, the service capacity of the network can carry a maximum of () 2 Mbit/s signal

Which of the following technologies is the main difference between open DWDM system and integrated DWDM system?

Which of the following layers define the protocols that control the network layer? The protocols at this layer apply to logical links, that is, end-to-end connections between two d...

The receiver performs a BIP8 check on the scrambled STM-16. If the BIP-8 check result is XOR, then the value of the B1 byte contained in the next STM-16 frame is 10001100, which me...

Which of the following is the meaning of SFD in the Ethernet frame structure?

Which of the following statements about the advantages of OTN is wrong?