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After a certain distance transmission in the wavelength division system, the optical signal-to-noise ratio of the signal at the receiving end will decrease to a certain extent. The main reason is which of the following?

A.

Use of EDFA

B.

Use of demultiplexer

C.

No new fiber is used

D.

Fiber attenuation is too large

What are the reasons for the R-Los alarm reported on the 0TU board?

A.

The local optical port is not used

B.

The local laser is turned off, resulting in no optical signal input

C.

Broken fiber or line performance degradation

D.

The receiving board at the local end is faulty, and the line receiving fails

OptiX OSN8800 provides 8 kinds of DCM optical modules, corresponding to compensation distances of 10km, 20km, 40km, 60km, 80km, 100km, 120km and 140km

respectively

A.

True

B.

False

The 1588V2 clock protocol can realize clock and time synchronization, and the working modes are OC, BC, TC.

A.

True

B.

False

The MPLS label has four identification fields, Lable, EXP, S and TTL, with a total of 4 bytes, of which Lable occupies 20 bits. The label value 0-15 is reserved for special purposes,

which indicates that the inner payload carried is MPLS-OAM packet. , the label value is which of the following?

A.

0

B.

1

C.

3

D.

14

The loss of optical fiber mainly includes the following?

A.

Absorption loss

B.

Reflection Loss

C.

Bending loss

D.

Scatter loss

In the PTN equipment, what is the default TAG mark of the Ethernet port?

A.

Tag Aware

B.

Access

C.

Hybrid

Which of the following reasons may cause bit errors in the business?

A.

The dispersion compensation is unreasonable, such as under-compensation or over-compensation

B.

The optical power of the incoming fiber is too high or too low

C.

The performance of the transmitting laser of the OTU board at the originating end deteriorates

D.

The pigtail connector is seriously polluted

E.

OSC board failure

A company has a class C IP address segment 198.160.110.0/24. The company has 6 departments, each department is located in a different subnet, and the number of hosts in each subnet

is the same as 25-30. Which of the following can be used as the subnet mask to reasonably plan the P address space?

A.

255.255.255.0

B.

255.255.255.128

C.

255.255.255.192

D.

255.255.255.224

Which of the following protection types is not supported by the L302 board?

A.

0DU3 SNCP

B.

Tributary SNCP

C.

SW SNCP

D.

In-board 1+1