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7
Chapter 1—Introduction and Description
network typically is converted from digitial to analog only once before
it reaches your modem. Upstream transmissions and transmissions
between client modems are limited to 33.6K bps, as are upstream
transmissions to non-V.92-compatible ISPs and downstream
transmissions that are converted more than once on the telephone line.
Note: Though these modems are capable of 56 Kbps download
performance, line impairments, public telephone infrastructure, and
other external technological factors currently prevent maximum
56 Kbps connections.
Modems on the ISI5634PCI card are Plug and Play capable with
interactive automatic dialing and command mode configuration. In
standard mode, you can store up to three command lines or telephone
numbers of up to 40 characters each in the modems nonvolatile
memory. The modems pulse- or tone-dial and recognize dial tones and
busy signals for reliable call-progress detection. The modems can
detect AT&T calling card tones. They also have DTR dialing, remote
configuration, 11-bit capabilities, and incorporate self-resetting
lightning protection. Serial port speeds can be set to 230,400 bps. They
are both FCC registered for connection without notification to the
telephone company.
The ISI5634PCI card has full-duplex intelligent modems with V.42
error correction, V.42bis and V.44 data compression, and Super G3
ITU-T V.34 fax communications at speeds up to 33.6K bps with Class
2.1 fax commands. Voice functionality (+V commands) has also been
added to the features of ISI5634PCI modems.
IntelligentSerialInterface
The ISI5634PCI is a multiport serial port expansion card that adds
data buffering on each port for enhanced serial port performance. The
ISI5634PCI features an on-board microprocessor to coordinate the
communications activity of your local and remote terminals. Using the
ISI5634PCI to provide additional serial connections enables your
systems processor to perform more efficiently since the ISI5634PCI
handles all byte-by-byte interrupts generated by asynchronous
terminals and stores the data in buffers.