October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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111Clock
13. Which are the types of clocks used for network synchronization and
plesiochronous operations and why?
14. What are the level of accuracies achieved in atomic clocks and how?
15. What are the salient differences between cesium beam and rubid-
ium clocks?
16. What are the accuracies required for various levels of PDH and what
types of clocks are used to obtain them?
17. What do you understand by the terms PRC, SSU, and SEC? What are
the accuracy requirements and what types of clocks are deployed?
18. What is the role of cost in the selection of a particular type of clock
for an application? Explain with example.
Critical Thi
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