AT&T System 75, Wiring Diagram

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CHAPTER 3. EQUIPMENT ROOM DESIGN
between the 110-type terminal block rows. Label code number 220A
(comcode 103 970 000) contains all of the 110-type labels.
CLEAR PLASTIC
DESIGNATION
STRIP
Figure 3-19. Clear Plastic Designation Strip
CO Trunk Labels (Green)
The labels shown in Figure 3-20 identify the network interface leads for
trunk circuits. On the top label, cable pairs are numbered consecutively
from 1 to 300 (in groups of five). The bottom label is blank and must be
filled in manually as required.
Label Code 221A—Green Labels (comcode 103 970 018)
Label code number 221A contains the following CO trunk labels:
●
●
(6) green trunk labels (Figure 3-20). The labels are numbered from
1 to 300. Each label identifies 50 trunk pairs.
(4) unnumbered green labels (Figure 3-20). Each label identifies
50 trunk pairs.
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