Ositech Communications Five of Hearts II, Руководство пользователя, Страница: 9 / 46

Introduction 7
About Optional Accessories
The Five of Hearts II PC Card is designed to function with a variety of optional
accessories that extend the card’s base functionality. For an up-to-date list of accessories
and the features provided by each, please contact Ositech or visit our website at
www.ositech.com. Current accessories include:
• CellFlex Dual Mode Cellular - Allows connections in both Analog and Digital Coverage
Areas
• GSM Cellular - Allows connection to popular GSM cellular phones for data/fax and SMS
operation
About Ositech’s DPI Technology
With Ositech’s exclusive Digital Phone Interface technology, you can make modem
connections through the handset cable of digital (PBX) phone systems found in offices
worldwide. This means you will always have access to the information you need while on
the road—send and receive data and faxes, and access the Internet—through office
digital (PBX) phones. Never again will you waste time searching for an analog phone
line.
Analog vs. Digital
PC Card modems are analog, that is, modems that send data over the telephone network
as a series of tones. The phones in your home are likely analog too. Thus, you can
connect your modem to your home telephone. Unlike the phones in your home, the
phones in offices are usually digital (PBX) phones. Companies use PBX (Private Branch
eXchange) phones because many people can share the incoming phone lines.
More than Just a Shield
Digital (PBX) phone systems use a higher current than analog phones. For this reason,
you cannot use your modem with a digital phone. In fact, connecting your modem to a
digital phone wall socket can damage your modem. To protect modems from the
damaging effects of digital phone systems, many modems have some form of defense.
Ositech’s modems include Digital Line Protector—a smart circuit which detects and
isolates digital currents, thereby preventing damage to the modem.
Even with such protection, standard analog modems still cannot connect through the
digital phone systems found in offices worldwide. This is where Ositech’s Digital Phone
Interface (DPI) technology comes in handy. With Ositech’s DPI, you can connect your
modem through the handsets of digital phones to make modem connections.
Universal Connectivity
DPI connections are made through the handset of a digital (PBX) phone. To begin, you
simply unplug the handset and plug the curly cable into the DPI coupler provided.