Modem Error Correction
Contents |
Administration Administration View All Network Conference News Networking Book Excerpts Networking Certs and Careers Networking Tutorials and Guides The OSI Model Working With Servers and isdn interface Desktops Data Center View All App Acceleration and Load
Error Detection And Correction In Computer Networks
Balancing Cloud Computing Architecture Cloud Networking Data Center Ethernet Data Center Infrastructure Green Data carrier telephony Center Design Storage Networks Administration View All Network Administration Network Conference News Networking Book Excerpts Networking Certs and Careers Networking Tutorials and cyclic redundancy check Guides The OSI Model Working With Servers and Desktops Infrastructure View All Ethernet IP Networking LANs (Local Area Networks) Network Design Network Hardware Network Mgmt View All Enterprise Energy Management Network Management Software and Tools Network Monitoring Network Performance Management Network Security Monitoring Network Security View All Desktop Networking Security Mobile Device Compliance Mobile Network Security Network Access Control Network Security Best Practices and Products Network Security Monitoring and Analysis Wireless Network Security Topics Archive View All 10 Gigabit Ethernet Networking Resources Virtualization View All Emerging Virtualization Technologies High Performance Computing Managing Virtualization Network Virtualization Implementation Networking for Mobile Desktop Virtualization Networking for VMware Infrastructures Server Virtualization Networking Storage Virtualization Virtualizing Networks WLANs View All Troubleshooting Wireless Networks Wireless LAN Implementation WLAN Security WLAN Standards Please select a category Data Center Administration Infrastructure Network Mgmt Network Security Virtualization WLANs Section Get Started News Get Started Evaluate Manage Problem Solve Sponsored Communities Home Network Administration Protocols modem error-correcting protocols Definition modem error-correcting protocols Posted by: Margaret Rouse WhatIs.com Contributor(s): Stephen Quattlebaum Share this item with your network: Sponsored News Cloud-Based Disaster Recovery –Comm
Quick Init Reference • Error Message Fixes • Line Noise Tests • Virus Removal Guide • Articles • F.A.Q.'s • Basic AT Commands • Access Server Codes • Tech Humor • Links • FREE Error Scan • News Archive • Search • Feedback • Survey • Legal • About Outdated DriversCan cause hardware related Errors. Check your PC Drivers now. What is error correction? Error correction refers to a set of protocols used to recover lost data, due to static or line noise. http://searchnetworking.techtarget.com/definition/modem-error-correcting-protocols When a packet of information gets transmitted as an analog signal (waves instead of 1s and 0s) it can easily be distorted. It always gets distorted a little, and sometimes a lot. It's an inherent part of the whole system, so we have to find a way to overcome it. Basically, modems break up their transmission into packets called "frames" http://www.modemhelp.net/faqs/error.shtml and attach a checksum to each of these frames. Any time the recieving modem recieves a frame that doesn't match its checksum, it requests the frame be resent. Though this may slow down data transfer, it makes it much more reliable. There are various protocols used to accomplish this, the most common of which being V.42, V.SREJ, and MNP2-4. These protocols are negotiated during the "handshake". Turning off error correction may help solve connection problems. Some modems are set to drop the connection if error control doesn't work out, or they simply time out when trying to work out the details. If no error correction is used, a connection can more likely be established on noisy lines, but entire transmissions will have to be resent when a part of the signal is lost or corrupt. So over all, performance will be reduced and it is a much better idea to solve your problem with error correction enabled. . This website is ©1999-Present Bradford Liedel DBA ModemHelp Networks and Web Services. Mason, MI 48854 USA. All rights reserved.
Fitness Art United States Environment Travel History People World Law Hobbies What are Modem Error-Correcting Protocols? On This Page 7 Links to Related Articles Watch the Did-You-Know slideshow Follow @wiseGEEK Article Details Written By: Kurt Inman http://www.wisegeek.com/what-are-modem-error-correcting-protocols.htm Edited By: Lauren Fritsky Last Modified Date: 22 September 2016 Copyright Protected: 2003-2016 https://www.vocal.com/data-modem/v-42/ Conjecture Corporation Print this Article Free Widgets for your Site/Blog Did You Know? NASA employs a planetary protection officer who ensures that we don't contaminate other planets with Earth life. more... get widget This Day in History October 22 , 1962 : US President John F. Kennedy ordered an air and modem error naval blockade in Cuba. more... get widget Subscribe to wiseGEEK Learn something new every day More Info... by email wiseGEEK Slideshows These 10 facts about space will blow your mind Top 10 unbelievable historical concurrencies Can you see through these real-life optical illusions? Top 10 facts about the world 10 hilariously insightful foreign words Adorable animal families that will make you "aww" 10 most extreme modem error correction places on Earth Top 10 amazing movie makeup transformations These 10 animal facts will amaze you You won't believe these 10 facts about people Modem error-correcting protocols are methods for detecting and correcting data transmission errors. Both hardware-based and software-based protocols exist and are often employed together. An individual modem usually uses a built-in hardware-based protocol to compensate for communication link noise. Systems at both ends of a link often use software-based protocols to cope with problems beyond a modem's control. Transmission error correction is generally a multiple-step process. Before each data packet is sent over the link, the transmitting modem computes its checksum and includes it in the packet. A Cyclic Redundancy Check (CRC) algorithm is often applied to determine the checksum. When the packet arrives, the receiving modem also calculates the data's checksum and compares it to the one already in the packet. If the two do not match, the receiver notifies the transmitter that it needs to re-send the bad data packet. In the 1980s, Microcom, Inc. introduced a family of hardware-based modem error-correcting protocols. Called the Microcom Networking Protocol (MNP), it consists of ten numbered classes which improved
CancellationLawful InterceptionVoiceVideoFaxData ModemRadioCommunication SecurityWebRTCPlatformsProcessorsOSResourcesPlatformsProcessorsOSReference DesignsVoIPEcho CancellationLawful InterceptionVoiceVideoFax ModemData ModemRadioCommunication SecurityResearchVoIPEcho CancellationAdaptive Interference CancellationLawful InterceptionVoiceFaxVideoCommunication SecurityDigital Signal ProcessingWhite PapersGlossaryAboutCompanyCareersNewsPatentsCompetenciesContactHome → Data Modem → V.42 / V.42bis Software V.42 / V.42bis SoftwareV.42 / V.42bis software implements the ITU-T V.42 error correction protocols including MNP2-4, MNP5, and MNP10 data protocols. In addition, both LAPM (Link Access Procedure for Modems) and an alternate protocol are supported. The alternate, as described by V.42, is the MNP (Microcom Networking Protocol) data protocol, classes 2 through 4. LAPM and MNP2-4 implement end-to-end error correction through an automatic repeat-transmission request algorithm. Contact us to discuss your modem application requirements.Virtual Modem over IPVOCAL’s SIP Software modem (MoIP or V.MoIP) solution provides developers a range of solutions to connect legacy dial up modems to modem infrastructure. Unlike other virtual modem designs, the SIP software modem can communicate with a physical modem at the far end using a VoIP service over an IP network.Modem over IP (M.oIP)SIP Software ModemVirtual Modem ServerRemote Access Server over IPVOCAL's V.42 / V.42bis modem software is optimized for performance on leading DSP architectures and processors from TI, Intel, ADI, AMD and other vendors. Our V.42 software may be licensed standalone, as a library or part of complete design. Custom solutions are also available.V.42 and V.42bis Software FeaturesModem MIB Support (RFC 1696)Extended Buffered Mode Support for V.80 featuresExtended Buffered Mode Supports V.110 rate adaptationExtended Buffered Mode Supports PPP Framing (RFC 1662)Detection PhaseAutomatic LAPM detectionMNP autoreliable m