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TC Systems, Inc. South Carolina - AT&T Clec Online

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6/23/04<br />

Attachment 3<br />

Page 30<br />

7.17 Each interface shall be provided by one or more sets (layers) of signaling links, as<br />

follows:<br />

7.17.1 An A-link layer shall consist of two links, as depicted in Figure 3.<br />

AT&T<br />

Local<br />

Switch<br />

A-Links<br />

SPOI<br />

SPOI<br />

LEC CO<br />

LEC CO<br />

LEC<br />

STP<br />

LEC<br />

STP<br />

FIGURE 3. A-LINK INTERFACE<br />

7.17.2 A D-link layer shall consist of four links, as depicted in Figure 4.<br />

AT&T<br />

STP<br />

AT&T<br />

STP<br />

D-Links<br />

D-Links<br />

FSPOI<br />

FSPOI<br />

FSPOI<br />

FSPOI<br />

FIGURE 4. D-LINK INTERFACE<br />

CCCS 206 of 433<br />

LEC CO<br />

LEC CO<br />

LEC<br />

STP<br />

LEC<br />

STP

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