Modem Error Control
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Error Correcting Modem
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Cyclic Redundancy Check
Tunebite 2017.0.30749 FocusWriter 1.6.2 Chromium 56.0.2897.0 More Downloads Windows XP Modem Tweak Guide Updated on January 23, 2002 by Thomas McGuire Check for Operating Systems or General Software prices here. Windows XP much like ever other Windows Operating System offers several improvements over the previous release (Most of the time) & Windows XP is no exception, offering some nice updates to the Networking features. This guide will take you through optimizing
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the performance, reliability & security of your Dial-up connection in Windows XP as well as several other tips. Internet Connection Setup Click on Start, Control Panel, then Network Connections. Right click on your Internet connection & select Properties. Then select Configure button. Maximum speed (bps). Users of 33.6K Modems should set this to 56700, while 56K Modem users should select 115200. Enable hardware flow control. Tick this setting to enable the use of hardware handshaking with your connection. For best connection stability & throughput ensure this setting is Ticked. Though in some (rare) cases you may find Unticking this setting can improve connection stability (Uses Software flow control instead). Enable modem error control. Tick this setting to enable the use of Modem error control, which will attempt to ensure data integrity in the connection, resending any damaged packets as necessary. I’d highly recommend enabling this. There are also Init strings available which can be used to disabled inefficient error control components. Enable modem compression. Data compression provides faster uploads/downloads depending on the data which is getting compressed. Should you have a Winmodem then you can leave this setting Unticked as these Modems do not support hardware compression. For regular, hardware, modems Tick this setting to enable the Modem to perform any data compression, which provides lower CPU usage over us
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in ITU-T recommendations V.42. Like many data link layer protocols, it is a variant of HDLC. Like the Microcom https://en.wikipedia.org/wiki/Link_Access_Procedure_for_Modems Networking Protocols that preceded it, LAPM uses cyclic redundancy checking (CRC) and retransmission of corrupted data (ARQ) to ensure data reliability. Error control protocols such as LAPM use frames of variable lengths, each beginning with a header and ending with a frame check sequence trailer (a cyclic redundancy check). Correctly received packets are acknowledged, and modem error unacknowledged packets are automatically retransmitted (ARQ). The larger the payload included in each frame, the smaller the relative cost of transmitting the header and trailer bits. Usually LAPM adds only about 5 percent framing overhead. This is a noticeable improvement over the fixed 25% overhead of start and stop bits required by direct asynchronous serial modem error control communication, but obviously such large frames impose a cost in the form of communication latency. LAPM has an optional Selective reject (SREJ) functionality which allows it to resend only the corrupted frames, providing faster recovery from an error. The ITU-T V.42 LAPM procedure is considered more robust than the Microcom Networking Protocols (MNP) that preceded it, and has a more sophisticated and powerful data compression option in V.42bis, allowing much greater data throughput. V.42bis added a string compression algorithm called BTLZ (British Telecom Lempel Ziv), in which frequently occurring strings of characters are replaced by code words. The "dictionary" of strings is dynamically maintained during transmission and keeps track of changes in the data; new strings are added and old strings are deleted. As the data may not always be compressible (for example encrypted or pre-compressed data) the modem has the ability to switch between compressed and uncompressed modes of operation. Compression performance is continually monitored and, if no compression is obtained, the mod
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