October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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309Synchronous Digital Hierarchy
10.17.2 STM-1 Level Multiplexing
Another way to form a higher level STM is to byte multiplex the STM-1s
after they are completely formed as STM-1s, i.e., the overheads are added
to the AUGs. In this case, the overhead bytes have to be dened freshly, as
the STM-N so formed has to work on a single set of overhead bytes (see the
STM-4 overhead in the next section). Figure 10.54 illustrates the principle.
This is the type of multiplexing that is normally deployed. The frame
structure of the higher-order STMs is nothing but a multiple of the STM-1’s
frame structure. However, there are small differences ...
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