3Com FEM656C Quick Start Manual page 12

Figure 3 shows how to connect to the network.
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Figure 4 shows how to connect to a telephone line.
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Figure 5 shows how to connect to the network and a telephone line
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simultaneously.
In some countries, you need a telephone line adapter to make the wall jack
accept an RJ-11 connector. To add a telephone set to the modem setup,
a duplex-style adapter may also be required. For information on adapters
for other countries, refer to the user guide.
Data or fax communications software packages must be set up correctly for
your modem to work properly. Follow the setup instructions supplied with
your software. Most applications use the factory-default setting for the
modem initialisation string. To change the default settings, use AT
commands and S-Register settings (see the User Guide for instructions about
using AT commands and S-Registers and the files AtCommandRef.htm and
SRegisterRef.htm on the Installation CD for a list of the commands).
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English