Paradyne Comsphere 3550 Series Quick Reference Manual page 4

Changing the Model 3550 DSU Hardware Straps
The Model 3550 DSU has a switch located behind its diagnostic control panel (DCP).
This switch contains two straps, one that controls the permissive or programmable
connection when a DBM is installed, and one that controls the frame-to-signal grounds.
Table 1 shows the DSU's settings.
"
Procedure
1. With your thumbs under the edge of the front bezel, firmly press upward to lift the
bezel from the tabs securing it in place.
2. Swing the front bezel up and set the bezel aside.
3. Refer to Table 1 to determine which switch needs to be changed. Then, using a
small instrument, carefully change the position of the switch.
4. Reinsert the front bezel's hinge tabs into position and swing the bezel down. Snap
the bezel back into place.
FRONT BEZEL
SNAP
TABS
SWITCH 1
HINGE TAB
LOCATIONS
2
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