AT&T System 75, Wiring Diagram

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CHAPTER 3. EQUIPMENT ROOM DESIGN
Repeat Steps 2, 3 and 4 until each backboard or connecting block
has been installed.
Note: The 66-type connecting blocks should not be installed more
than 78-1/2 inches above the floor.
Installing Cable Slack Managers
To install the cable slack managers (Figure 2-17), proceed as follows:
1.
2.
3.
Place the Z113A cable slack manager against the wall under the
cross-connect field (Figure 3-9), aligning the left side of the cable
slack manager with the first terminal block of the trunk/auxiliary
field.
Place the next cable slack manager beside the previously installed
cable slack manager. Align the tabs and interlocks, and snap the
cable slack managers together.
Repeat Step 2 until all cable slack managers are installed.
Note: Nine holes (¼-inch) are provided in a cable slack manager
base in the event earthquake mounting is required. Also, if a cable
slack manager base is mounted on an uneven floor, shims may be
required to level it and insure proper fit of the covers. Holes are
provided in the sides of the base for bolting cable slack managers
together. Bolts and shims must be obtained locally.
Labeling the Cross-Connect Field
Labeling 110-Type Terminal Blocks
Figure 3-18 shows the graphic symbols used (instead of words) on
labels for the switch, cross-connections, information outlets, and cables
for the system. The labels are color-coded to identify system wiring as
follows:
●
●
●
Green—Leads to CO
Purple—Leads to switch ports
Yellow—Leads to auxiliary equipment and miscellaneous switch
leads
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