AT&T System 75, Wiring Diagram

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Cross-Connect Hardware Selection
Cross-Connect Hardware Selection
For new wiring installations, the following cross-connect hardware is
available for use in the system. Each item lists certain considerations
that should help to select the appropriate hardware.
1. 110P Hardware
2. 110A Hardware
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●
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Patch cord design allows customer to administer
cross-connections
Requires some technical skill to administer cross-connections
Design does not permit customer participation in
cross-connect administration—requires technically skilled
personnel to administer cross-connections
Hardware is less expensive than the patch cord systems, but
installation and administrative costs are greater
3. 66-type Hardware
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Design does not permit customer participation in
cross-connect administration—requires technically skilled
personnel to administer cross-connections
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Hardware is less expensive than the patch cord systems, but
installation and administrative costs are greater
Obviously, the customer’s interest and preference for administering
cross-connections (because of likely lower total annual costs, as well as
the capability to administer the cross-connections at the most convenient
time) should be given primary consideration in recommending
cross-connect hardware.
Figure 1-4 shows a block diagram of the equipment required to install a
System 75 or 75 XE switch. The sites shown in Figure 1-4 are physical
locations (closets) for pass-through connections where adjunct power
may be applied. The satellite is a physical location (closet) where
cross-connect administration can take place and adjunct power may be
applied.
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