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7
Chapter 1—Introduction and Description
digital to analog only once before it reaches your modem. Upstream
transmissions and transmissions between client modems are limited to
data rates of 33.6 Kbps, as are downstream transmissions that are
converted more than once on the telephone network.
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 four command lines or telephone
numbers of up to 40 characters each in the modems nonvolatile
memory. In callback security mode, you can store up to 30 passwords
and dialing strings. 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, Caller ID, remote configuration, callback security, two-wire
leased-line, and 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 data compression, and V.17 (14,400 bps), Class 1
and 2, Group 3 fax capabilities. Voice functionality (+V commands) has
also been added to the features of ISI5634PCI modems.
Intelligent
Serial
Interface
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.