3.2 CONFIGURATION STRAPS
In addition to the configuration switches described above, the Model 1075 is also equipped with two internal straps that set the DTE/DCE Configuration and the
NOTE: Before opening the case, determine whether the default settings are correct for your application (see Sections 3.2.3 and 3.2.4)
3.2.1 Opening the Case
To open the Model 1075 insert a flat head screw driver into an open slot on either side of the case, as in Figure 3. Twist the screw driver head slightly and the top half of the case will separate from the lower half, as in Figure 4, below.
Figure 3. Opening the 1075 Case with a Small Screwdriver
Figure 4. Opening the 1075 Case With a Small Screwdriver
To close the case, fit the 2 halves together snugly and snap them back in place.
3.2.2 Location of the Internal Straps
Figure 5 (below) shows the location of the DCE/DTE switch and the JP1 strap on top side of the the PC board.
JP1 Strap
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Rear
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Figure 5 . Position of DTE/DCE and JP1 Jumper Straps on Model 1075 PC Board
3.2.3 Setting the DCE/DTE Strap
The X.21 interface on the Model 1075 is DCE/DTE switchable. The default setting is DCE, based upon how the Model 1075 sees its own orientation. When configured this way, the Model 1075 will want to connect to an X.21 DTE device.
DTE
DCE
Figure 6 . Close-Up of Model 1075 PC Board With Close-up of DCE/DTE Strap
Default Setting = “DCE”
The X.21 DCE/DTE strap is located near the
To change the DCE/DTE orientation of the Model 1075 X.21 interface, simply remove the strap and rotate it 180o so the appropriate arrows are pointing toward the
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