October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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425Emerging Systems and the Future of SDH
Thus, the VC-4s belonging to the rst frame (see Figure 14.7) means the
payload for the rst frame of “1/8000th second” may reach after the VC-4
carrying the payload for the 2nd frame of “1/8000th second” or may be after
the 3rd or fourth frame. In such a situation, how do you identify and realign
them at the receiver? We need to nd the exact sequence of VC-4s, which was
constructed out of the GB Ethernet payload before transmission.
To identify the VCs, each group of VCs falling in one frame is given a
“frame number,” and within the group, each VC is given a sequence number.
Thus, if we c ...
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