19.3
SYNCHRONOUS DIGITAL HIERARCHY
505
Figure 19.19
AU-4 pointer offset numbering. [From ITU-T Rec. G.709, Figure 3-1/G.709 (Ref. 7).]
Figure 19.20
AU-3 offset numbering. [From ITU-T Rec. G.709, Figure 3-2/G.709 (Ref. 7).]
As shown in Figure 19.21, the AU-4 pointer value is a binary number with a range
of 0782, which indicates offset, in three-octet increments, between the pointer and the
first octet of the VC-4 (see Figure 19.19). Figure 19.21 also indicates one additional valid
point, the concatenation indication. This concatenation is given by the binary sequence
1001 in bit positions 14; bits 5 and 6 are unspecified, and there are ten 1s in bit
Summary :
19.3 SYNCHRONOUS DIGITAL HIERARCHY 505 Figure 19.19 AU-4 pointer offset numbering. 7).] As shown in Figure 19.21, the AU-4 pointer value is a binary number with a range of 0782, which indicates offset, in three-octet increments, between the pointer and the first octet of the VC-4 (see Figure 19.19).
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