PON（Passive Optical Network：无源光纤网络)，是一种基于拓扑的（)技术。

关于PON的定义,说法正确的是()

A无源光网络:Passive Optical Network

B是一种基于P2P拓朴的技术

C是一种应用于接入网,局端设备(OLT)与多个用户端设备(ONU/ONT)之间通过无源的光缆、光分/合路器等组成的光分配网(ODN)连接的网络。

D支持高带宽,远距离传输

A.The average optical power of the optical interface is measured as follows. One end of the pigtail is connected to the light emitting interface of the optical board and the other end is connected to the input interface of the optical power meter. After the optical power becomes stable, read the value, which is the transmitting optical power of the optical interface.

B.The average optical power of the optical interface is measured as follows. One end of the pigtail is connected to the light receiving interface of the optical board and the other end is connected to the input interface of the optical power meter. After the optical power becomes stable, read the value, which is the transmitting optical power of the optical interface.

C.The sensitivity and overload indicator of optical interface are measured as follows. Increase the adjustable optical attenuator gradually and observe the critical value when the optical interface generates an error code. Record the optical power value at this time, which is the sensitivity.

D.The sensitivity and overload indicator of optical interface are measured as follows. Reduce the adjustable optical attenuator gradually and observe the critical value when the optical interface generates an error code. Record the optical power value at this time, which is the overload indicator.

ansmit data.

transmit data.

Third-generation optical discs are in wide use, meant for distributing high- definition video and support greater data storage capacities.、

ptical computing？

A．The technology is more expensive to develop than the technology that was required in electronic computing.

B．The search for technology necessary for all-optical computing is considered unfeasible and has been largely abandoned.

C．Optical computers systems that rely on digital partitioning algorithms in tandem with error-correction codes are considered hybrid technology.

D．The technology necessary for digital optical computing appears within closer reach than the technology for analog optical computing.

E．The most feasible version of optical computing at present is a synthesis of electronic and optical technology.

The optical mouse is superior to the basic one in that the former has no moving parts.

A．Right

B．Wrong

C．Not mentioned

The optical mouse is superior to the basic one in that theformer has no moving parts.

A. Right

B. Wrong

C. Not mentioned

A.Optical transmit unit (OTU)

B.Optical add/drop multiplexer (OAD)

C.4-channel 644M sub-rate convergence board(SRM42)

D.2-channel Gigabit Ethernet convergence board(GEM2)