AT&T 75 Wiring Manual page 83

Emergency Transfer Label—Z1A Unit
There are two labels (see Figure 2-38) that can be used for the Z1A Emergency Transfer
Unit. The top label shown in Figure 2-38 is used on the EM XR row for 400B cable access
panels equipped with the Z1A unit. It can also be used for externally mounted Z1A units.
The top half of the label identifies leads to the Z1A unit and the connection point for -48
volts dc power. When used with the preinstalled Z1A unit, the bottom half of the label is
used to identify connections for alarm outputs from an Applications Processor or Auxiliary
Cabinet on the 1D terminal row. When used with an externally mounted Z1A unit, the
bottom half of the label identifies 3-pair auxiliary circuits that connect directly through the
CAP to the switch. This would include connections such as those from a 71A data mounting
to a Digital Line circuit pack.
The bottom label shown in Figure 2-38 is used when the Z1A unit is used and located outside
the CAP. The top half of the label is identical to the label used for the preinstalled Z1A
unit. The bottom half of the label is used to identify 1-pair or 3-pair trunk circuits that
connect to the network interface.
Emergency Transfer Labels—574-5 Unit
The two labels shown in Figure 2-39 show an example of how to modify the Z1A Emergency
Transfer Unit labels (Figure 2-38) to be used for the 574-5 power transfer unit. The right
hand portion of the label must be changed as shown in the exploded view in Figure 2-39.
The 574-5 unit is preinstalled in the 400C cable access panel.
Z100-TYPE HARDWARE
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