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User Guide
36
Required Equipment
In addition to the contents of your modem package, you need the fol-
lowing equipment.
Computer
Your modem can be connected to any computer with an RS-232/V.24
serial port, such as most PCs. It can also be connected to the RS-422
serial ports on Apple Macintosh computers.
To use the modem at its highest speeds, a PC must have either of the
following:
A serial port with a 16550AFN UART
A Multi-Tech ISI (Intelligent Serial Interface) card, such as the
ISI551 (single port), ISI552 (dual port), or ISI608 (8 ports)
These devices can handle serial port rates up to 115,200 bps, which is
sufficient for all uploads and most 56K downloads. For downloading
highly compressible files at 56K speeds, however, your serial port
should be capable of speeds to 230,400 bps.
Serial Cable
To connect the modem to your computer, you must provide a shielded
serial cable, obtainable at computer stores and many office supply
stores. The cable should have a male DB-25 connector at the modem
end. For PCs, the other end may have a male DB-25 connector or a
female DB-9 connector, depending on your particular computer and
whether you are using the COM1 or the COM2 serial port.
Most Macintosh computers require a round, 8-pin, mini-DIN connector.
The Macintosh serial cable should be wired for hardware flow control.