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1<br />

1<br />

1<br />

1<br />

1<br />

30 digital<br />

inputs,<br />

64 kb/s each<br />

30<br />

1st-level<br />

multiplexer<br />

2<br />

3<br />

4<br />

2nd-level<br />

multiplexer<br />

2<br />

3<br />

4<br />

3rd-level<br />

multiplexer<br />

2<br />

3<br />

4<br />

4th-level<br />

multiplexer<br />

2<br />

3<br />

4<br />

5th-level<br />

multiplexer<br />

565.148 Mb/s<br />

(7680 VF)<br />

Four<br />

2.048-Mb/s<br />

inputs<br />

Four<br />

8.448-Mb/s<br />

inputs<br />

Four<br />

34.368-Mb/s<br />

inputs<br />

Four<br />

139.264-Mb/s<br />

inputs<br />

2.048 Mb/s<br />

(30 VF)<br />

8.448 Mb/s<br />

(120 VF)<br />

34.368 Mb/s<br />

(480 VF)<br />

139.264 Mb/s<br />

(1920 VF)<br />

Figure 3–41<br />

CCITT digital TDM hierarchy.<br />

217

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