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Which of the following statements about 100G coherent PDM-QPSK modulation is incorrect?

A.

The essence of QPSK modulation is to reduce the baud rate of the optical signal by half without reducing the line rate by selecting 4 possible values in the phase of the optical field.

B.

PDM-QPSK technology is the main modulation code technology for 100G transmission, which can reduce the line rate of 112Gb/s to the baud rate of 28Gbaud/s, greatly reducing the loan requirements for (optical)

electrical devices.

C.

PDM polarization multiplexing technology is adopted, which has better nonlinear tolerance than 40GePDM-BPSK.

D.

PDC-QPSK supports DCMfree and DCM system applications, and supports smooth upgrade from existing 10G/40G network to 100G system.

In Optix PTN, what kind of MPLS Tunnel APS protection is supported?

A.

1+1 single-ended protection

B.

1+1 double-ended protection

C.

1:1 single-ended protection

D.

1:1 double-ended protection

Which of the following descriptions about network protection switching test is wrong?

A.

Before testing, you need to set the 1:1 linear multiplex section protection mode to single-ended switching.

B.

During the protection switching of the linear multiplex section, the NE reports the APS_INDI and MS_APS_INDI_EX alarms

C.

SNCP protection is configured. When the laser of the interface connected to the opposite end is turned off, observe the SDH analyzer of the local end.

D.

There are two methods for testing the protection switching of the multiplex section: the single-ended loopback test method and the double-ended hanging meter

test method

According to the formula of ODUk rate2391C 239K) STMHM to car: ODUI to car 239/235- STMN frame rate.

A.

True

B.

False

Which of the following statements about Uexpert is correct?

A.

Uexpert can automate U2000 upgrades

B.

Support U2000 remote graphical upgrade

C.

Currently does not support dual system upgrade

D.

Basic Ueasy inspection tool to reduce the risk of upgrade failure

On PTN3900, which type of interface signal does MP1 motherboard + MQ1 processing daughter card handle?

A.

E1

B.

STM-1

C.

FE

D.

GE

Which of the following levels does MPLS-TP OAM detect?

A.

Tunnel layer

B.

Section layer

C.

PW layer

D.

link layer

CAR is deployed on PTN equipment. Which of the following descriptions is wrong?

A.

The value of PIR is required to be greater than or equal to CIR

B.

The unit of CBS/PBS is Bytes

C.

CBS bursts are marked in yellow

D.

Supports setting the processing mode for CAR-processed packets

Which statement about MPLS OAM is wrong?

A.

The hardware supports the transmission of messages

B.

Support real-time monitoring of performance events such as packet loss rate and delay

C.

Can be used to trigger protection switching

D.

Tunnel's OAM and PW OAM are related and affect each other

MPLS is located between the data city road layer and the network layer in the TCP/IP protocol stack, and is used to provide services to the IP layer, and at the same time, it gets the business from the mallet road layer.

A.

True

B.

False