In order to support the self-opening of the base station and deploy the DHCP Relay function in the PTN LTE bearer network, which one of the following descriptions is wrong?

In WDM systems, the use of dielectric thin film filters (TFFs) is ideal when less than ( ) wavelengths are used.

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?

Four network elements form an STM-4 two-fiber bidirectional multiplexing section protection ring. Which of the following is the maximum service capacity on the ring network?

The frame rate of STM-1, STM-4, STM-16, STM-64 signals are all the same 8000 frames/sec.