The Win32_POTSModem class has these properties.
Current auto-answer or callback setting for the modem.
Unknown (0)
Other (1)
Disabled (2)
Manual Answer (3)
Auto Answer (4)
Auto Answer with Call-Back (5)
Port to which the POTS modem is attached.
Example: "COM1"
Availability and status of the device.
Running or Full Power
The device is known to be in a power save mode, but its exact status is unknown.
The device is in a power save state but still functioning, and may exhibit degraded performance.
The device is not functioning, but could be brought to full power quickly.
The device is in a warning state, though also in a power save mode.
The device is paused.
The device is not ready.
The device is not configured.
The device is quiet.
Command string used to detect a dial tone before dialing.
Example: "X4"
Command string used to dial whether or not there is a dial tone.
Example: "X3"
Short description of the object.
All modem connection protocols with which this modem device is compatible.
Data compression characteristics of the modem.
Command string used to disable hardware data compression.
Example: "S46=136"
Command string used to enable hardware data compression.
Example: "S46=138"
Win32 Configuration Manager error code.
Device is working properly.
Device is not configured correctly.
The driver for this device might be corrupted, or your system may be running low on memory or other resources. (3)
Driver for this device might be corrupted, or the system may be low on memory or other resources.
This device is not working properly. One of its drivers or your registry might be corrupted. (4)
Device is not working properly. One of its drivers or the registry might be corrupted.
The driver for this device needs a resource that Windows cannot manage. (5)
Driver for the device requires a resource that Windows cannot manage.
The boot configuration for this device conflicts with other devices. (6)
Boot configuration for the device conflicts with other devices.
Driver loader for the device is missing.
This device is not working properly because the controlling firmware is reporting the resources for the device incorrectly. (9)
Device is not working properly. The controlling firmware is incorrectly reporting the resources for the device.
Device cannot start.
Device failed.
This device cannot find enough free resources that it can use. (12)
Device cannot find enough free resources to use.
Windows cannot verify the device's resources.
This device cannot work properly until you restart your computer. (14)
Device cannot work properly until the computer is restarted.
This device is not working properly because there is probably a re-enumeration problem. (15)
Device is not working properly due to a possible re-enumeration problem.
Windows cannot identify all the resources this device uses. (16)
Windows cannot identify all of the resources that the device uses.
Device is requesting an unknown resource type.
Device drivers must be reinstalled.
Registry might be corrupted.
System failure: Try changing the driver for this device. If that does not work, see your hardware documentation. Windows is removing this device. (21)
System failure. If changing the device driver is ineffective, see the hardware documentation. Windows is removing the device.
Device is disabled.
System failure: Try changing the driver for this device. If that doesn't work, see your hardware documentation. (23)
System failure. If changing the device driver is ineffective, see the hardware documentation.
This device is not present, is not working properly, or does not have all its drivers installed. (24)
Device is not present, not working properly, or does not have all of its drivers installed.
Windows is still setting up the device.
Windows is still setting up the device.
Device does not have valid log configuration.
Device drivers are not installed.
This device is disabled because the firmware of the device did not give it the required resources. (29)
Device is disabled. The device firmware did not provide the required resources.
This device is using an Interrupt Request (IRQ) resource that another device is using. (30)
Device is using an IRQ resource that another device is using.
This device is not working properly because Windows cannot load the drivers required for this device. (31)
Device is not working properly. Windows cannot load the required device drivers.
If TRUE, the device is using a user-defined configuration.
Modem initialization string. This property is made up of command strings from other properties of this class.
Array of countries/regions in which the modem can operate.
Country/region for which the modem is currently programmed. When multiple countries/regions are supported, this property defines which one is currently selected for use.
Name of the first concrete class to appear in the inheritance chain used in the creation of an instance. When used with the other key properties of the class, the property allows all instances of this class and its subclasses to be uniquely identified.
List of currently defined passwords for the modem. This array may be left blank for security reasons.
Control settings for a serial communications device, in this case, the modem device.
If TRUE, this POTS modem is the default modem on the computer system running Windows.
Description of the object.
Unique identifier of this POTS modem from other devices on the system.
Name of the device loader for the modem. A device loader loads and manages device drivers and enumerators for a given device.
Physical type of the modem.
The values are:
Null Modem ("Null Modem")
Internal Modem ("Internal Modem")
External Modem ("External Modem")
PCMCIA Modem ("PCMCIA Modem")
Unknown ("Unknown")
Type of dialing method used.
Unknown (0)
Tone (1)
Pulse (2)
Date of the modem driver.
If TRUE, the error reported in LastErrorCode is now cleared.
Command string used to enable error correction control when establishing a connection. This increases the reliability of the connection.
Example: "+Q5S36=4S48=7"
Error correction characteristics of the modem.
Unknown (0)
Other (1)
No Error Correction (2)
MNP 4 (3)
LAPM (4)
Command string used to disable error control.
Example: "+Q6S36=3S48=128"
Command string used to enable error control.
Example: "+Q5S36=7S48=7"
More information about the error recorded in LastErrorCode, and information on any corrective actions that may be taken.
Command string used to enable hardware flow control. Flow control consists of signals sent between computers that verify that both computers are ready to transmit or receive data.
Example: "&K1"
Command string used to disable flow control. Flow control consists of signals sent between computers that verify that both computers are ready to transmit or receive data.
Example: "&K0"
Command string used to enable software flow control. Flow control consists of signals sent between computers that verify that both computers are ready to transmit or receive data.
Example: "&K2"
Multiplier used with the InactivityTimeout property to calculate the timeout period of a connection.
Time limit (in seconds) for automatic disconnection of the phone line, if no data is exchanged. A value of 0 (zero) indicates that this feature is present but not enabled.
Index number for this POTS modem.
Example: 0
The device instance ID for this POTS modem.
Example: "1&08"
Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows 8, Windows Server 2008 R2, Windows 7, Windows Server 2008, and Windows Vista: This property is available beginning with Windows Server 2016 Technical Preview and Windows 10.
Date and time the object was installed. This property does not need a value to indicate that the object is installed.
Last error code reported by the logical device.
Maximum settable communication speed for accessing the phone system.
Maximum settable communication speed to the COM port for an external modem. Enter 0 (zero) if not applicable.
Number of passwords definable in the modem itself. If this feature is not supported, enter 0 (zero).
Model of this POTS modem.
Example: "Sportster 56K External"
Path to this modem's .inf file. This file contains initialization information for the modem and its driver.
Example: "C:\Windows\INF"
Name of the section in the modem's .inf file that contains information about the modem.
Command string used to instruct the modem to use Bell modulations for 300 and 1200 bps.
Example: "B1"
Command string used to instruct the modem to use CCITT modulations for 300 and 1200 bps.
Example: "B0"
Modulation scheme of the modem.
Unknown (0)
Other (1)
Not Supported (2)
Bell 103 (3)
Bell 212A (4)
V.22bis (5)
V.32 (6)
V.32bis (7)
V.turbo (8)
V.FC (9)
V.34 (10)
V.34bis (11)
Label by which the object is known. When subclassed, the property can be overridden to be a key property.
Windows Plug and Play device identifier of the logical device.
Example: "*PNP030b"
Definition of the port used for this modem.
Array of the specific power-related capabilities of a logical device.
This property is inherited from CIM_LogicalDevice.
The power management features are currently enabled but the exact feature set is unknown or the information is unavailable.
The device can change its power state based on usage or other criteria.
Timed Power-On Supported
If TRUE, the device can be power-managed (can be put into suspend mode, and so on). The property does not indicate that power management features are currently enabled, only that the logical device is capable of power management.
Dialing prefix used to access an outside line.
List of all the properties (and their values) for this modem.
Network path to the computer that provides the modem services.
Command string used to instruct the modem to use pulse mode for dialing. Pulse dialing is necessary for phone lines that are unable to handle tone dialing.
Example: "P"
Command string used to reset the modem for the next call.
Example: "AT&F"
Response this modem might report to the operating system during the connection process. The first two characters specify the type of response. The second two characters specify information about the connection being made. The second two characters are used only for Negotiation Progress or Connect response codes. The next eight characters specify the modem-to-modem line speed negotiated in bits per second (bps). The characters represent a 32-bit unsigned long integer format (byte and word reversed). The last eight characters indicate that the modem is changing to a different port or Data Terminal Equipment (DTE) speed. Usually this field is not used because modems make connections at a locked port speed regardless of the modem-to-modem or Data Communications Equipment (DCE) speed.
Number of rings before the modem answers an incoming call.
Command string used to turn the modem speaker on after dialing a number, and turning the speaker off when a connection has been established.
Example: "M1"
Command string used to turn the modem speaker off.
Example: "M0"
Command string used to turn the modem speaker on.
Example: "M2"
Command string used to instruct the modem to turn the speaker on (until a connection is established).
Example: "M3"
Command string used to set the modem speaker to the highest volume.
Example: "L3"
Describes the volume level of the audible tones from the modem.
Unknown (0)
Other (1)
Not Supported (2)
High (3)
Medium (4)
Low (5)
Off (6)
Auto (7)
Command string used to set the modem speaker to the lowest volume.
Example: "L1"
Command string used to set the modem speaker to a medium volume.
Example: "L2"
Current status of the object. Various operational and nonoperational statuses can be defined. Operational statuses include: "OK", "Degraded", and "Pred Fail" (an element, such as a SMART-enabled hard disk drive, may be functioning properly but predicting a failure in the near future). Nonoperational statuses include: "Error", "Starting", "Stopping", and "Service". The latter, "Service", could apply during mirror-resilvering of a disk, reload of a user permissions list, or other administrative work. Not all such work is online, yet the managed element is neither "OK" nor in one of the other states.
Values include the following:
OK ("OK")
Error ("Error")
Degraded ("Degraded")
Unknown ("Unknown")
Pred Fail ("Pred Fail")
Starting ("Starting")
Stopping ("Stopping")
Service ("Service")
Stressed ("Stressed")
NonRecover ("NonRecover")
No Contact ("No Contact")
Lost Comm ("Lost Comm")
State of the logical device. If this property does not apply to the logical device, the value 5 (Not Applicable) should be used.
Other (1)
Unknown (2)
Enabled (3)
Disabled (4)
Not Applicable (5)
Type of characters used for text passed through the modem.
The values are:
ASCII string format ("ASCII string format")
DBCS string format ("DBCS string format")
UNICODE string format ("UNICODE string format")
If TRUE, the modem supports callback.
If TRUE, synchronous, as well as asynchronous, communication is supported.
Value of the scoping computer's CreationClassName property.
Name of the scoping system.
String that marks the end of a command string.
Example: "<cr"
Date and time the modem was last reset.
Command string that instructs the modem to use tone mode for dialing. The phone line must support tone dialing.
Example: "T"
Command strings used to activate the voice capabilities of a voice modem.
Example: "AT+V"