The GSM modem can be used as the primary source of communication or as backup to the PSTN modem or IP communication. The SPCN310.000 GSM module can be assigned to any mobile network by the insertion ...

The I-Modem is a full length ISA card which has one jack for a Basic Rate ISDN line and one for a standard PSTN line in its rear bracket. It also has a small red box containing four DIP switches ...