H31-311_V2.5 Exam Questions

The essence of OPSK modulation is to select four possible values on the phase of the optical field so as to reduce the baud rate of the optical signal by half without reducing the...

OTN has its own unique frame structure and rich overheads to operate, manage and maintain signals during transmission, such as SM, PM and TCMi overheads to monitor service signals...

T-SDN and ASON can both perceive the resources of the entire network and achieve centralized control of the resources, services, and pipelines of the entire network.

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

D1-D12 are digital communication path bytes, of which D1-D6 are used for the regeneration section and D7-D12 are used for the multiplexing section.

Users can easily access NCE through a browser without having to install additional traditional client software.

Additional services cannot be configured on the protection channel of 1:1 linear multiplex section protection.

OLA stations can also be monitored using ESC.

APS lossless protection switching provides dual-transmission and selective reception functions for fiber differential protection services, as well as end-to-end delay alignment fun...

TNG 1N401 board supports mixed transmission of multiple ODUk particles.

Fiber amplifiers can be divided into rare earth ion doped fiber amplifiers (Rare Earth Ion Doped Fiber Amplifier) and nonlinear fiber amplifiers. The working principle of rare eart...

The frame structure of OTUk at each level is the same.

1:N linear multiplex section protection: when the working channel is unavailable, the service is switched to the protection channel for transmission, and the additional service ori...

DWDM technology utilizes the large bandwidth and low loss characteristics of single-mode optical fiber, uses multiple wavelengths as carriers, and allows each carrier channel to be...

The flexible pipe provided by MS-OTN equipment means that the service can be carried through ODUk or PW.

The 1510nm optical supervisory channel can be effectively amplified through EDFA.

The size of the OTUk frame is fixed, that is, whether it is OTU1, OTU2, or OTU4, it is 4 rows and 4080 columns.

The function of the pointer is to locate and indicate the starting position of VC-n in the corresponding AU or TU frame. Through positioning, the receiving end can correctly separa...

In WDM systems, the reduction in optical signal-to-noise ratio is mainly due to the increasing amount of noise introduced into the optical fiber line.

In actual wavelength division systems, systems with rates of 100G and below are less affected by polarization mode dispersion.

Sending test frames will affect normal business.

The segment overhead of STM-4 is 9+9+4 lines/frame.

SXCL board only supports SDH service cross-connection.

The primary and backup ports of the linear multiplexing segment must be on the same board.

The difference between ASON network and ordinary network is that it introduces the concept of signaling.

In the Directionless scenario, the current path cannot be flexibly adjusted.

T-SDN supports centralized control of multiple domains and multiple vendors.

TU-AIS is often encountered during network maintenance. The existence of AU-LOP alarm in the network will not trigger this alarm.

RSOH, MSOH, HPOH and LPOH complete the monitoring functions in a layered manner.

TPS protection belongs to single-board level protection, and its switching process does not require the participation of the cross-board.

Consider an optical fiber as a "multi-lane" public road. The traditional TDM system only uses one lane of this road. Increasing the bit rate is equivalent to speeding up the drivin...

OPC is an optical layer platform board that needs to be used with a pluggable module to work properly.

From the following barcode 02846710HC000085 Y1 LPS-FRM800-PIU, it can be seen that the production date of this board is December 2017.

The number of signals multiplexed from ODU2e and ODU2 to ODU3 is 4.

Colored scene Each add or drop port can only add or drop fixed wavelengths.

Ethernet service OAM focuses on the maintenance of end-to-end Ethernet links, while Ethernet port OAM focuses on the maintenance of point-to-point Ethernet links between two direct...

When the 80-wavelength OTM site uses M40V for wave combining, it is also necessary to configure an ITL board.

The preamble of the Ethernet frame structure is 7 bytes long, and the bit pattern of each byte is 10101010.

In a small network, the function of an OptiXtrans DC908 is equivalent to that of a high-density electrical layer device FOADM + OLA.

EVPLAN form is mainly used to realize point-to-point and point-to-multipoint communications.

SNCP (Sub-network Connection Protection) is mainly used to protect cross-subnet services and has the characteristics of dual transmission and selective reception.

FAS is the frame alignment overhead, with a length of 6 bytes, located in the 1st row and the 1st to 6th columns. The 1st to 3rd bytes are 3 OA1 bytes, each OA1 is always "1111 011...

LDG supports electrical layer scheduling at the ODU1 level.

The number of network elements (including REG) in a two-fiber bidirectional multiplex section shared protection ring can exceed 16.

In Ethernet, the frame length has a lower limit, which is mainly due to the following considerations?

When serious bit error seconds occur in the PM segment of ODUk, the network management will report the ODUk_PM_ES alarm.

If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex may be used instead of full-duplex.

OSN 3500 has strong branch service up and down capabilities, with 16 branch outgoing line slots, 504 2M, 32 E4, 117 E3/DS3, 132 STW-1e up and down on a single subrack, providing ST...

The levels of forced switching, fiber break switching, manual switching, and practice switching are arranged from high to low.

Physical port: also known as MAC port, which is the external port of the board.