Patton electronic 1082 - Manual (Page 18)

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multiplexer. When connecting the X.21 interface of the Model 1082 to your
DTE device, use a X.21 straight through cable (see Figure 8).
Figure 8. Connecting the Model 1082 to X.21 DTE or DCE
To change the DCE/DTE orientation from the default position (DCE), you
must open the case Model 1082 case.
Opening the Case
To open the Model 1082 case, insert a flat head screw driver into an open
slot on both sides of the case, as shown in Figure 9. Twist the screw driver
head slightly and the top half of the case will separate from rest of the case.
Figure 9. Opening the 1082 case with a small screwdriver
Straight-through
15-pin D-Sub cable
Model 1082 (DCE)
Model 1082
DSL Span
Router (DTE)
or
Mux (DCE)