H31-341_V2.5 Exam Questions

The backplane has two -48V power lines. Each board gets two 48V power supplies from the backplane. Various voltages required for each component are obtained through DC/DC power sup...

G707 multiplexing circuit diagram can only multiplex 2M\34M\140M signals into STM-N.

If a network port that supports auto-negotiation is connected with a network port that does not support auto-negotiation, half-duplex to full-duplex may occur.

When configuring i Ethernet Layer 2 attributes, when the "TAG ID" is set to "Accese" or "Hybrid", you need to set the "Default VLAN ID" and "VLAN Priority" of untagged frames. "VLA...

In the electrical layer overhead processing-sink function, when the signal flow is from OCh to Client, first detect PMODUkP; then detect TCM ODUKT.

The lower the noise figure creep value of the amplifier, the less noise the amplifier introduces.

OTM nr.m consists of at most "n" optical multiplexing channels. Non-channel related overhead is not supported. The letter "r" indicates reduced functionality.

When setting the LCAS mode, please follow the following principles: 1 If the equipment at both ends is Huawei equipment, please set it to "standard mode" 2 If Huawei equipment is i...

APAUSE frames using reserved multicast addresses are not forwarded by bridges or switches. This way the PAUSE frame does not generate any other information.

STM-N signals are transmitted on the line through scrambling mainly to facilitate the receiving end to extract line timing signals. All bytes in the SDH frame structure will be scr...

VPLS (Virtual Private LAN Service) is a Layer 2 VPN technology that simulates a local area network.

The NG WDM electrical layer service board supports compatibility mode and standard mode. Compared with the compatibility mode, the standard mode single board only displays the serv...

FXO port provides feed, ringing, overvoltage/overcurrent protection, line monitoring, codec, 2/4 wire conversion and test, a total of 7 functions, referred to as BROSCHT.

The TAG attribute cannot be set for the internal port VCTRUNK of the board on the NMS.

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

Automatic laser shutdown (ALS: When no optical signal is received, the ALS function automatically turns off the corresponding optical module. This function can protect on-site main...

The clock unit can only access the external clock source through the external clock interface as the timing signal source of the system. Plus: it can also output a processed clock...

ROADM sites can use WSMD9 single boards to support a maximum of 9 dimensions. If the number exceeds 9 dimensions, it can be realized by cascading WSMD9 single boards.

When the bridge uses IV L learning mode. Create an entry in the MAC address table based on the original MAC address and original port of the data frame. This entry applies to all V...

If the tunnel to which the PW belongs is configured with tunnel APS, the PW cannot be configured with PW APS.

If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex and full-duplex modes can be interconnected.

Some SNCP protection switching conditions are default. For example, AUAIS and TUAS. Other conditions are optional. For example, HP-TIM and HP-SLM. Optional conditions can be flexib...

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

1: N-linear multiplex section switching requires the APS switching protocol; equipment from different manufacturers may be different due to protocol processing, and may not be inte...

The cross-connect capacity of the NG SDH system is determined by the cross-connect board, so the upgrade of the cross-connect capacity is accomplished by replacing the cross-connec...

Ethernet dedicated line service is a point-to-point service form in topology, and is mainly used to realize point-to-point transmission of Ethernet services.

By resetting a single board, restarting a single station, re-delivering configuration, or switching services to a backup channel, it is possible to effectively troubleshoot and res...

It is not recommended to configure the EPLAN service as a ring. If the EPLAN business is configured as a ring network, the STP protocol must be enabled on the network to prevent br...

E1 has framing, multi-framing and non-framing. The main difference is that the time slots for effective data transmission are different.

LCK insertion is preferred over AlS insertion. That is to say, if the user configures LCK insertion and meets the conditions for automatic AIS insertion, LCK is inserted

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

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

The network element automatically backs up the network element database to the FLASH library every 30 minutes by default.

64K and SNCP support internal port access and external port access. In the external port access mode, the cross-connection between the DXM board and the SP3D board needs to be conf...

HWECC uses D1-D3 bytes as the physical transmission channel, and cannot use D4-D12 as the physical transmission channel.

For a typical fixed WDM system, the channel spacing is N*5Oghz, for a WDM system based on the FlexGrid optical platform, the channel spacing is N*12.5Ghz.

OCI stands for Open Connection Indication. The signal sent downstream indicates that the upstream management command in the connection function has opened the matrix connection, an...

The OTS path refers to the physical fiber connection between two adjacent OM/OD/OA on the main optical path.

SDH&PDH tester is mainly used to test OTU's jitter, bit error characteristics and other indicators, and it can also be used as a test signal source to provide test signals for OTU.

The two PIU/APIU boards of the OSN 1800 equipment use hot backup to supply power to the system. When one PIU/APIU board fails, the system can still work normally.

The scope of management of OMSn 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 rece...

PWE3 is a processing mechanism that simulates the key attributes of a certain service and transmits it end-to-end on the PSN network through a tunnel (IP/MPLS).

40 Gbit/s non-coherent and 100 Gbit/s coherent mixed transmission WDM systems can add DCM modules according to actual conditions.

Systems with a rate of 10G and below are less affected by polarization mode dispersion, which can generally be ignored.

The TNG1M404DM single board is a wavelength conversion board that can multiplex 4 channels of 40 Gbit/s services to 2 channels of 200G signals.

The strength of the nonlinear effect of optical fiber is related to the optical power entering the fiber, the spectral width of the optical signal, and the characteristics of the m...

For a system with an optical amplifier, the upper threshold of the received optical power of the wavelength division side of the OTU single board or the line single board (PIN type...

The commissioning goal of the non-standard fiber-in scenario is that the actual single-wavelength fiber-in power value at the fiber-in power reference point is less than or equal t...

For a system without an optical amplifier, the upper threshold of the received optical power of the wavelength division side of the OTU single board and the line single board is -3...

For hybrid transmission systems, the principle of coherent commissioning should be followed first.