October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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409Data Over SDH
ATM cell. A part of the last ATM cells is thus allowed to get into the next
VC-4,orin other words, it is allowed to cross the boundary of the container
VC-4.
Although the example shown above is for a single VC-4, similar mapping
will be done for a concatenated VC-4-X
c
. The mapping in the case of VC-3 or
VC-3-X
c
will also be similar.
13.5.2 ATM Mapping in VC-2
The process of mapping the ATM cells into VC-2 remains the same as that
used for VC-4. The VC-2 structure is a four frame multiframe of 428 bytes, of
which 4 bytes are overhead bytes and the remaining 424 bytes are data bytes.
The mapping is shown in Figure 13.9.
We can
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