Question 96
The SDH frame structure is a rectangular block frame with which of the following options as the unit.
Question 97
On the network management system, the network element performance monitoring time is set to () minutes and () hours.
Question 98
The special fiber input power (high power) is higher than the main fiber input power. The main purpose is to improve what factor?
Question 99
The essence of QPSK modulation is to select 4 possible values on the optical field phase, so that the baud rate can be reduced by half without reducing the line rate.
Question 100
The unit of insertion loss is dBm.