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214<br />

24 DS-0<br />

inputs,<br />

64 kb/s each<br />

(1 VF/input)<br />

1<br />

24<br />

1st-level<br />

multiplexer<br />

DS-1<br />

output<br />

1<br />

2<br />

3<br />

4<br />

2nd-level<br />

multiplexer<br />

DS-2<br />

output<br />

1<br />

7<br />

3rd-level<br />

multiplexer<br />

DS-3<br />

output<br />

1<br />

6<br />

4th-level<br />

multiplexer<br />

DS-4<br />

output<br />

1<br />

2<br />

5th-level<br />

multiplexer<br />

DS-5<br />

output<br />

560.160 Mb/s<br />

(8064 VF)<br />

Four DS-1 inputs<br />

Seven DS-2 inputs Six DS-3 inputs Two DS-4 inputs<br />

DS-1 line<br />

DS-2 line<br />

DS-3 line<br />

DS-4 line<br />

1.544 Mb/s<br />

(24 VF)<br />

6.312 Mb/s<br />

(96 VF)<br />

44.736 Mb/s<br />

(672 VF)<br />

274.176 Mb/s<br />

(4032 VF)<br />

Figure 3–40<br />

North American digital TDM hierarchy.

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