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576<br />

Tip (green wire)<br />

POTS line card<br />

Hybird<br />

(2 wire to 4 wire)<br />

Transmit<br />

PCM<br />

encoder<br />

24 DS-0<br />

• • •<br />

Time<br />

division<br />

multiplexer<br />

Transmit<br />

DS-1<br />

to CO<br />

Subscriber<br />

line<br />

(to telephone)<br />

200<br />

200<br />

Balancing<br />

network<br />

DS-0 PCM signal<br />

(64-kb/s)<br />

24<br />

lines<br />

90 V, 20 Hz<br />

Ring<br />

voltage<br />

generator<br />

• • •<br />

+<br />

48 V<br />

Ring (red wire)<br />

• • •<br />

Receive<br />

PCM<br />

encoder<br />

24 DS-0<br />

DS-0 PCM signal<br />

(64-kb/s)<br />

• • •<br />

Time<br />

division<br />

multiplexer<br />

Received<br />

DS-1 signal<br />

from CO<br />

(a) POTS Line Card in a RT<br />

Figure 8–4(a) (continued).<br />

DS-0

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