October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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374 Principles of Synchronous Digital Hierarchy
The switching action is performed at the section layer on the ring and does
not involve path layer indications.
The MS SPRING can be realized using two or four bers. Each type has its
own merits; thus, both types are in use. We will discuss both these models
and divide the subject into the following subheads:
(i) Principles of working
(ii) Switching mechanism
(iii) Other important features
12.9.1.1 Principles of Working
12.9.1.1.1 Two-Fiber MS SPRING
A two-ber MS SPRING is shown in Figure 12.17. Obviously the ring is
formed using only two bers.
Each of the bers carries trafc
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