The ACP Modem for Linux is a software based modem. Support software for the ACP modem is composed of a loadable kernel module and a user level application. Together these components support direct connection to public switched telephone networks (PSTNs) and support selected countries world wide. Refer to Section 6 of this document for the supported country list.
The modem also supports the standard communications port interface (ttySx) and is compatible with the Hayes AT Command Set.
ACP Modem software is continually under development. If you encounter bugs or usability issues, please contact us and we'll work to correct them.
The latest version of this driver is available from http://www.ibm.com/linux/ltc/
Thomas Hood's Debian GNU/Linux on IBM ThinkPad 600 and 600x page contains lots of useful information.
The ACP Modem provides the following features:
Standard asynchronous COM port interface (NS16550A UART compatible) operation
Bell-103/212A, CCITT-V.21/V.22,V.22bis protocols with data from 300 to 2400 bps
CCITT-V.32 protocols with data rates of 4800, 9600 uncoded, and 9600 bps Trellis coded (Optional)
CCITT-V.32bis protocols with data rates of 4800, 9600, 12000, and 14400 bps (optional)
ITU-T V.34 protocols with data rates from 2400 to 33600 bps.
Error correction via Microcom Network Protocol (MNP) classes 1-4