Which of the following network element forms supports the functions of branch and line, cross multiplexing between lines and lines, and service adding and dropping functions?

Digital cross-connect equipment

Which of the following network element forms supports the functions of branch and line, crossmultiplexing between lines and lines, and service adding and dropping functions?

Digital cross-connect equipment

Which of the following items belong to the debugging work of the playback system?

Commissioning the protection function

Which of the following are common reasons for pointer adjustment

The power supply of the subrack is faulty, which causes the clock board to work abnormally, and the AU and TU pointers are adjusted together.

The fault of the cross-board board causes the clock quality of its distribution to be poor, causing the adjustment of the AU and TU pointers

The clock source or clock source level is incorrectly configured, resulting in two clock sources or two NEs in the same network following each other, causing the AU and TU pointers to be adjusted

The power supply of the subrack is faulty, which causes the clock board to work abnormally, and the AU and TU pointers are adjusted together.

The fault of the cross-board board causes the clock quality of its distribution to be poor, causing the adjustment of the AU and TU pointers

Road version failure, together with AU, TU pointer adjustment

Which of the following options are the basic requirements of DWDM system for light source

Output standard and stable wavelength

The method using direct modulation

Compared with PDH, which of the following are the main advantages of SDH?

High frequency band utilization

To create a unicast BFD session between two IP addresses in a PIN network, which of the following must be satisfied?

IP address routing is reachable

The "remote identifier" of the local end and the "local identifier" of the remote end

IP address routing is reachable

The message sending interval of both parties is the same

The "remote identifier" of the local end and the "local identifier" of the remote end

IP addresses at both ends must be in the same network segment

When deploying ring network protection in the PTN7900 network, which items are wrong?

The east-west interface bandwidth of the ring network must be consistent, otherwise the ring network cannot be deployed

When configuring a ring network, the east-west interfaces of the ring network can be on the same board

Ring network protection and LSP APS protection can be configured at the same time

The tunnel that carries the service needs to be bound to the ring network, so that the ring network can protect the service

The east-west interface bandwidth of the ring network must be consistent, otherwise the ring network cannot be deployed

When configuring a ring network, the east-west interfaces of the ring network can be on the same board

In the PTNLTE non-load sharing scheme, the main L3 configuration is used to configure the route tracking multi-hop BFD scheme to prevent loops. Which of the following configurations needs to be performed?

Create a loopback interface address on the active L3

Create the BFD between the main L3 Loopback interface device L3 and the EPC port

The primary L3 configures the backup traceroute BFD to the EPC

Create a loopback interface address on the active L3

Create the BFD between the main L3 Loopback interface device L3 and the EPC port

The standby L3 configures the standby traceroute BFD to the EPC

The primary L3 configures the backup traceroute BFD to the EPC

Create an ETH private line service in the PTN network, and connect an Ethernet tester to the UNI port for RFC2544 testing. The instrument shows that the current port has only sending traffic and no receiving traffic. What are the possible reasons?

The VLAN on the Ethernet tester is inconsistent with the service WLAN

The remote UNI port of the test service on the PTN is not configured with inner loopback

The instrument optical module does not match the equipment optical module

The VLAN on the Ethernet tester is inconsistent with the service WLAN

The remote UNI port of the test service on the PTN is not configured with inner loopback

The instrument optical module does not match the equipment optical module

The PTN side limits the service rate

When enabling NE performance monitoring events on the U2000 network management system, which of the following options are correct?

Set the monitoring start time of 15 minutes on the U2000 (must be later than the current time of the NMS and NEs)

15-minute monitoring end time (must be later than 15-minute monitoring start time), can not be set

Set the monitoring start time of 15 minutes on the U2000 (must be later than the current time of the NMS and NEs)

Set the monitoring start time of 15 minutes on the U2000 (it can be earlier than the current time of the NMS and NEs)

15-minute monitoring end time (must be later than 15-minute monitoring start time), can not be set

15 minutes monitoring end time (must be later than 15 minutes monitoring start time), must be set

During the normal operation of the network, the service channel protected by ODUK SNCP generates a condition for triggering protection switching, and the service has been automatically switched to the protection channel. When the fault of the working channel is eliminated, the service cannot be automatically restored to the working channel.

The SNCP service type is inconsistent with the service scenario requirements

Protection group 'Recovery Mode' is 'Non-Recovery'

Manual switching, locking switching or forced switching commands are implemented artificially

When the working channel is normal, the business needs to delay the "waiting for recovery time" and then switch from the protection channel to the working channel.

The SNCP service type is inconsistent with the service scenario requirements

Protection group 'Recovery Mode' is 'Non-Recovery'

A small number of bit errors occur in the working channel

Manual switching, locking switching or forced switching commands are implemented artificially

When the working channel is normal, the business needs to delay the "waiting for recovery time" and then switch from the protection channel to the working channel.