The Shift From Analogue To Digital Circuits; Client And Server Modems - US Robotics Sportster Flash x2 User Manual

The Shift from Analogue to Digital Circuits

When the first telephone networks were established, they were
completely analogue. Over time, telephone companies began replacing
portions of their analogue networks with digital circuits, which provided
a higher telephone signal quality at a more economical price.
Today, the PSTN is almost entirely digital. Typically, the only portion of
the telephone network that remains analogue is the line that connects
your home to the telephone company's local exchange. The rest of the
telephone network is digital.

Client and Server Modems

x2 will not require changes to your wiring and equipment that's already
in place. All that is required to use x2 is a software upgrade.
Client Modems
x2 client modems can receive data at speeds up to 56kbps
data at V.34 speeds up to 33,600bps. The following products are
examples of U.S. Robotics brand Client Modems:
Courier™ V.Everything™ with x2
Sportster® with x2
Analogue Modem Pools or NETServer with x2
Server Modems
The digital x2 modems that x2 client modems connect to are called x2
server modems. Server modems can send data to x2 client modems at
speeds up to 56kbps. A server must have a "digital" interface to the
PSTN. This digital interface can be in the form of a "trunk-side" T1,
Primary Rate Interface (PRI) , or Basic Rate Interface (BRI). The
following products are examples of server x2 modems:
Courier I-modem with x2 (in Server Mode)
Quad Modem 5.0/5.1 (in Server Mode)
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Pending line conditions
Sportster Flash x2 - User's Guide
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and send
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