 Take our Quick Survey and enter a drawing for a chance to win a $100 VISA Gift Card.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. This Linux ACP Modem driver was ported from the Windows NT™
version of the driver available from IBM. Many thanks to
Keith Frechette, Charles Ball, and Frank Novak for their
technical and support efforts in making this project
possible. Copyright (c) 2002 IBM Corporation This document may be reproduced or distributed in any form
without prior permission. Modified versions of this document
may be freely distributed, provided that they are clearly
identified as such, and this copyright is included intact. This document is provided "AS IS", with no express or implied
warranties. Use the information in this document at your own
risk. This version of the ACP Modem driver supports the IBM
Thinkpad™ 600E, 600, and 770 that include on-board ACP modem hardware. 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. 56K capable modem Hayes AT Command Set compatibility DTMF and pulse dialing Asynchronous error recovery protocol Error correction via Microcom Network Protocol (MNP) classes
1-4 Error correction via the V.42 error correction standard MNP class 5 for up to 2x data compression V.42bis for up to 4x data compression "Adaptive Rate Negotiation" which provides for "Fallback /
Fallforward" as line quality deteriorates or improves
Your modem contains 56K technology. To take advantage of this
technology, you must first make sure that your Internet Service
Provider (ISP) supports a 56K modem protocol. Significantly
higher modem connection speeds, up to 56kbps, require all-digital
transmission connections from your ISP to the line card in the
central office from which your phone line is connected. The
actual connection rate may be limited by the quality of your
telephone lines. Telephone line quality may vary from location to location.
Current regulations limit maximum trasfer rates to 53K. While
your modem contains 56K technology, typical maximum connection
rates in the receive direction may be significantly less than
56K. Currently, 56K capability is for the receive direction
only. The transmit direction uses V.34 technology.
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