What is ltmdmnt?

The genuine ltmdmnt.sys file is a software component of LT V.92 Data+Fax Modem by Alcatel-Lucent.
Ltmdmnt.sys is a system driver that belongs to Lucent Technologies V.92 Data+Fax Modem, a DSP (digital signal processor) modem. Drivers enable hardware components to communicate with software without additional programming from the software developer. This file is not a critical Windows file and can be removed if known to create problems. Lucent Technologies V.92 Data+Fax Modem was first introduced when 56k data transmission speeds were freshly introduced into the market. The first V.92 modems developed by Lucent Technologies were based on the 1648T or HV90 chipsets. Lucent Technologies, Inc. was an American company that developed telecommunications equipment. It was founded in 1996 after the selling-off of AT&T Technologies, a unit of the AT&T Corporation. The company is currently known as Alcatel-Lucent after the merger with Alcatel SA of France in 2006. The company was based in Murray Hill, New Jersey, United States.

LTMdmNT stands for Lucent Technologies Modem Driver for Windows NT

Ltmdmnt.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if ltmdmnt.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for ltmdmnt drivers in need of updating

Ltmdmnt.sys file information

The process known as LT Windows Modem or Agere Windows Modem belongs to software LT V.92 Data+Fax Modem or Agere V.92 Data+Fax Modem by LT ( or Agere Systems (

Description: The original ltmdmnt.sys is an important part of Windows and rarely causes problems. The file ltmdmnt.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 625,537 bytes (33% of all occurrences), 606,684 bytes and 4 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The ltmdmnt.sys file is a Windows system file. The program has no visible window. There is no detailed description of this service. Ltmdmnt.sys is a Microsoft signed file. The application has no file description. ltmdmnt.sys appears to be a compressed file. Therefore the technical security rating is 7% dangerous.

Recommended: Identify ltmdmnt.sys related errors

Important: Some malware disguises itself as ltmdmnt.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the ltmdmnt.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving ltmdmnt issues

A clean and tidy computer is the key requirement for avoiding problems with ltmdmnt. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the ltmdmnt.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

ltmdmnt.sys [all]