AT&T 75 Wiring Manual page 287

Figure 3-49. 4-Pair Station Wiring From the Satellite Closet Labels
The label code for the blue station labels is 224A which contains the following:
35 blue labels (see Figure 3-47) that identify 3-pair station circuits from the
equipment room. Each label identifies sixteen 3-pair station circuits. The labels are
numbered sequentially from 1 to 560.
Label Code 224A—Blue Labels (103 970 042)
110-TYPE HARDWARE
3-71