A. 10
B. 32
C. 64
D. 84
E. 96
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A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing
最新試題
In order to avoid misconnections due to a failed node in an MS-SPRing， Alarm Indication Signals （AISs） are sent on every channel normally terminating in that node. What is the name of this process？（）
A 2.5 Gb/s （OC-48 or STM-16） optical signal with a dispersion tolerance of 1200 ps/nm goes through fiber with 18ps/nm*km of dispersion. How many 15216-DCU-350 equivalents are needed for enough compensation after traveling 100 km？（）
In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（）
For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （）
In SDH， what is the name of the embedded Data Communication Channel （DCC） in bytes D1-D3？（）
Click the Exhibit button. Which type of multiplexer is shown in the exhibit？（）
The ONS 15216 is a 32-channel system. The ONS 15216 OADMs are capable of adding and dropping one， two， or four channels. How are the OADMs provisioned to add and drop specific channels？（）
Which device creates an OEO conversion？ （）
A VC-4-4c consists of （）.
Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications？（）