October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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220 Principles of Synchronous Digital Hierarchy
Figure 8.29). All the bits occur at xed positions or TSs in the frame. Thus,
when the receiver receives an incoming E2 bit stream, it looks for the pattern
of “FAS, i.e., 1111010000”; as soon as it locates this sequence of bits, it recog-
nizes the following 838 (848-10) bits, per the predened functions assigned
to various bits per their numbers. The receiver counts the bits and recognizes
bit 11 as the alarm bit, number 12 bit as the bit for national use, and so on.
After bit 12, it comes across bit 13, which is a data bit from tributary 1, bit 14
from tributary 2, 15 from tributary 3, and 1
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