If your internet has begun to act up or not seem to work as well as it once did, you will naturally be looking for a cause. Before you begin browsing the latest Spectrum compatible modems, you need to ask yourself: when was the last time that you updated your modem’s drivers?
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Modem drivers are essential in allowing the operatingsystem to work properly and, just as technology continually changes, you needto be sure that your modem’s drivers are keeping up with the times. Here’s howyou can update your modem drivers in Windows 10.
Whatis a Driver?
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Let’s take a quick look at what a modem driver is. Amodem works by gathering data from your system and transmitting the data overtelephone lines, fiber optic cables, or cable lines in order to deliver thedata to another modem.
The driver itself is a piece of code that tells thedata transfer to happen. The information is coded in between modems and unencryptedat the receiving modem.
WhyUpdate Drivers?
Drivers need to be kept updated because of how much and how quickly technology changes. Drivers can include updates that correct any mishaps in code previously written, as well as helping keep your network safe from any new threats that could be headed your way. Updating your driver allows it to take in new information about any threats or malware that could be headed your way.
Updatingyour Modem Driver
In order to update your modem driver in Windows 10, tomake sure that is using the latest technology, you need to do the following:
- Click on the Start button on the lowerleft-hand corner.
- Scroll down to Settings and click on it.
- Under settings, go to the Devices link.
- Here you should see Phone/Modem options.
- Select your modem and then the Drivertab.
- Click on Update Driver Software
- There should then be an update wizard tohelp walk you through the full updating process.
Alternatively, if you want to be certain that yourmodem has received all of its driver updates, you can go to the modem’s websiteand see what the latest update was and whether you already have it. You shouldalso reboot the computer in order to make sure the new driver has succeeded.
Troubleshooting
Once in a while, a modem driver might not be workingwell itself. If you downloaded a new driver, recently updated your operatingsystem, or if your driver isn’t working with new software provided by your ISP,then you might need to review your modem driver.
In the case that you just downloaded a new driver andit is not working correctly, the driver might have been corrupted or damagedduring the download, but it could also be an indication of malware on yourcomputer. In any of these cases, the safest course of action is to re-installthe modem driver. You can do that by following the steps that we listed outabove.
When all else fails, it is time to contact themanufacturer for your modem and do some troubleshooting with their customer serviceas well. They should be able to walk through it with you and figure out what isreally going on.
-->Versions supported
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- Windows 10
- Windows 8.1
Applies to
- Device manufacturers of CDC Control devices
Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.
- Improved PnP and power management by the driver (such as, handling surprise removal).
- Added power management features such as USB Selective Suspend.
In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.
Usbser.sys installation
Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
Note
If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.
Windows 10
In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.
USBClass_02
USBClass_02&SubClass_02
- If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
- If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
- If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.
Note
Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.
Windows 8.1 and earlier versions
In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.
The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.
For more information, see this KB article.
Configure selective suspend for Usbser.sys
Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:
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To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:
'0x00000001': Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
'0x00000000': Enters selective suspend only when there are no open handles to the device.
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That entry can be added in one of two ways:
Write an INF that references the install INF and add the registry entry in the HW.AddReg section.
Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, 'IdleUsbSelectiveSuspendPolicy' and wPropertyNameLength to 62 bytes. Set the bPropertyData field to '0x00000001' or '0x00000000'. The property values are stored as little-endian 32-bit integers.
For more information, see Microsoft OS Descriptors.
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Develop Windows applications for a USB CDC device
If you install Usbser.sys for the USB CDC device, here are the application programming model options:
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Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.
In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:
Win32 programming model:
.NET framework programming model: