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3.5
V.35 Shunt
Either EIA-232-D or ITU-T V.35 electrical signal interface can be selected on the Data connector. Units are
shipped with EIA-232-D signal levels selected. Use the following procedure to select V.35.
CAUTION : This procedure requires opening the unit. Like most products of this type, this product contains
components that are sensitive to static and static discharge. Use your best efforts to avoid static discharge
when contacting the components inside this unit.
WARNING: Always disconnect the power cord before opening the enclosure to avoid any chance of electric
shock.
1.
Unplug the power cord.
2.
The enclosure consists of two halves. Using a Phillips screwdriver, remove the two screws from the
bottom of the unit. Remove the top half.
3.
Carefully pry the shunt out of its RS232 socket and insert it into the V.35 socket.
4.
Carefully reassemble the unit, making sure no foreign objects are accidentally left inside.
5.
The DSU is now configured for V.35 signal levels. To connect to a device with a 34-pin Winchester
female V.35 connector, use an adapter cable with a 25-pin female connector at one end and a 34-pin
Winchester male connector at the other end. Using the signal pin designations in Appendix A, you can
make or order a cable from most any cable vendor.
V.35 Shunt Position
RS232 Shunt Position
Figure 3-2. Shunts
Chapter 3 - Unpacking & Setup
18
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