H31-311_V2.5 Exam Questions

SDH is a complete hierarchical structure of standardized digital signals that can be used for synchronous digital transmission, multiplexing and cross-connection.

On the optical path, the optical power of noise will not decay with increasing distance.

In WDM network design, as long as enough EDFAs are cascaded to compensate for the optical power loss during transmission, the system can transmit over a long distance without limit...

If one device does not support auto-negotiation, but the other device does, the other device may operate in half-duplex mode (Q107).

If a business call is required between two REG devices, E1 or E2 bytes can be used.

The UITL single board realizes the multiplexing and demultiplexing of 50GHz and 100GHz interval signals.

A bidirectional ring means that the routes for sending and receiving services are consistent, that is, they correspond to consistent routes.

The two PIU/APIU boards of the OptiXtrans E6616 or E6608 (0ptiX OSN 1800 V Pro or 1800 1 Pro) equipment use hot backup to power the system. When one PIU/APIU board fails, the syste...

Arrayed waveguide grating optical wavelength division multiplexing device has the advantages of small wavelength spacing, large number of channels, and flat passband. It is very su...

The packet service board can perform L3 layer processing on the accessed Ethernet services.

For OTN interfaces without optical layer overhead, in order to achieve monitoring purposes, OTUk/OTUk-v/OTUkV and OTUCn signals are terminated when the interface signal is terminat...

When the optical signal-to-noise ratio drops to a certain level, it will seriously endanger the performance value of the system.

Unified line type single board supports mixed transmission of OTN, SDH and packet services, and also supports the transmission of one of the services.

TNG1M404DM board can realize the multiplexing of 4 100Gbit/s services to 2 200G wavelength conversion boards.

The nominal rate of the OTU4 signal is 111809973.568 kbits, and we can generally consider the line rate to be about 112G.

Colored scene can use TM20/TD20 board to add and subtract waves.

When the optical fiber is connected but the business is not available, E1 or E2 bytes can be used for official communication between the sites.

For ODUk SNCP protection, if the pass-through site is an electrical relay site, it is recommended to configure the SNCP type as SNC/I when configuring the protection.

40Gbit/s and 100Gbits coherent systems do not require dispersion compensation because the dispersion tolerance of coherent boards is very large. NG WDM does not support mixed trans...

Traditional SDH equipment can directly access Ethernet services.

ROADM sites can support up to 9 dimensions using the TSMD9 board. If the number exceeds 9, it can be achieved by cascading WSMD9 boards.

The transmitting end detects that b6-b8 of the K2 byte is 110, indicating that the transmitting end generates an MS-AIS alarm.

OL board, OLA board and OPC board can all amplify optical signals.

The information net load area contains not only business information, but also some channel overhead for monitoring low-speed signals.

Multicast forwarding can be understood as selective broadcasting. The host listens to a specific multicast address, receives and processes frames whose destination MAC address is t...

In the electric power dispatching system, dispatching data is transmitted in the transmission network and data network in the form of Ethernet services.

OptiXtrans DC908 can predict failures based on trends and volatility, foresee all gradual failures in advance, and realize the transition from passive operation and maintenance to...

Two PD1 boards and one DMS board jointly implement the TPS protection function.

OTN technology is developed based on SDH and WDM technology, and combines the advantages of both technologies.

MSTP supports dynamic allocation of bandwidth based on the amount of data.

NCE's software deployment method adopts B/S (Browser/Server) architecture.

The dispersion coefficient of G655 single-mode optical fiber is smaller than that of G.652 single- mode optical fiber.

The core of the TCP/IP model is the network layer and the transport layer. The network layer solves the logical forwarding problem between networks, and the transport layer ensures...

40G non-coherent systems and 100G coherent systems cannot be mixed.

On the two-fiber bidirectional multiplex section protection ring, the first half of the VC-4 of each STM-N line is the working channel, and the second half of the VC-4 is the prote...

NGWDK adopts LO-L1+L2 triple-extension architecture, in which the L2 layer implements switching based on Ethernet/MPLS-TP, the L. layer implements switching based on ODUk/C, and th...

The user adjusts the service bandwidth in real time. The NCE control unit sends the new bandwidth to the device and adjusts the CIR and PIR of the service PW. The service will not...

When configuring 1+1 optical line protection, you can select RI1TO1 or RI2/T02 as the working channel according to actual conditions.

The transmission network is at the lowest level in the public telecommunications network hierarchy.

Ethernet_II and IEEE802.3 frame types are distinguished by the Type/Length field value; most data frames in Ethernet use the Ethernet_II format.

The 48 wave OTM site needs to be equipped with an OAU amplifier for signal amplification.

The technology of using a local oscillator laser of the same frequency to coherently receive the optical signal and recover the amplitude, phase and polarization state information...

The size of OTUk frame is variable.

Automatic gain control (AGC) can solve the problem of increased optical power in multi- wavelength systems where the increase in wavenumber or decrease in derivative energy transfe...

The 1+1 protection mechanism on the customer side implemented by the SCS board or the OLP board is different.

User management can ensure the security of user information and system. The core of user management is to achieve decentralized management.

The rate of STM-0 is 51.84Mbit/s; (STM-0 is used for digital microwave).

Modulation is the process of processing the information of the signal source and adding it to the carrier to make it suitable for channel transmission. It is a technology that chan...

PDM modulation splits the laser into two perpendicular polarization directions, x and y, through a polarization beam splitter.

The segment overhead of STM-16 is 9*8*16 bytes/frame.