CHAR-MIB

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Category: Network Interfaces

Description:

Implements RFC 1658 character stream device management for terminal servers and character-oriented network port hardware.

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge
TimeTicks
experimental

From RFC1213-MIB

DisplayString

What Is CHAR-MIB?

CHAR-MIB is the standard IETF MIB module defined in RFC 1658 for managing character-stream (asynchronous serial/terminal) devices such as terminal servers and character-oriented network ports. It exposes objects describing character port configuration (line speed, parity, flow control) and per-port operational/error statistics for serial character streams. It is a general device/interface management MIB rather than a hardware-health MIB in the CPU/temperature sense, but it does support monitoring port-level operational status and error counters (e.g., framing/parity/overrun errors) that reveal a failing serial line or misconfigured terminal connection. Because it manages character-oriented ports, it is commonly used alongside RFC 1213 (MIB-II) ifTable entries, since each character port typically corresponds to an interface. It is deployed on terminal servers, console/serial concentrators, and other network devices that expose async serial ports for character-based access. Engineers implementing or auditing this functionality typically reference the CHAR-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in CHAR-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

What Can Be Monitored

character port line configuration (speed, parity, flow control)
port operational status
serial port error counters (framing/parity/overrun)

Supported Devices

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
terminal server / character-oriented serial port device

Monitoring Examples

No object or table names were extracted for this MIB (sample_objects is empty), so specific table/object identifiers cannot be cited; based on the RFC 1658 specification, an administrator would typically poll the character device's port configuration objects to confirm line speed/parity/flow-control settings and check per-port error counters (e.g., overrun, framing errors) to identify a failing or misconfigured serial connection.

OIDs

OID symbolic	OID numeric	Type	Access	Description
char	1.3.6.1.3.19
INT charNumber	1.3.6.1.3.19.1	INTEGER	read-only	The number of entries in charPortTable, regardless of their current state.
INT charPortAdminOrigin	1.3.6.1.3.19.2.1.15	INTEGER	read-write	The administratively allowed origin for establishing session on the port. 'dynamic' allows 'network' or 'local' session establishment. 'none' disallows session establishment.
INT charPortAdminStatus	1.3.6.1.3.19.2.1.6	INTEGER	read-write	The port's desired state, independent of flow control. 'enabled' indicates that the port is allowed to pass characters and form new sessions. 'disabled' indicates that the port is allowed to pass characters but not form new sessions. 'off' indicates that the port is not allowed to pass characters or have any sessions. 'maintenance' indicates a maintenance mode, exclusive of normal operation, such as running a test.
charPortEntry	1.3.6.1.3.19.2.1		not-accessible	Status and parameter values for a character port.
OID charPortHardware	1.3.6.1.3.19.2.1.4	AutonomousType	read-only	A reference to hardware MIB definitions specific to a physical port's external connector. For example, if the connector is RS-232, then the value of this object refers to a document defining objects specific to RS-232. If an agent is not configured to have such values, the agent returns the object identifier: nullHardware OBJECT IDENTIFIER ::= { 0 0 }
CTR charPortInCharacters	1.3.6.1.3.19.2.1.13	Counter	read-only	Total number of characters detected as input from the port since system re-initialization and while the port operational state was 'up', 'active', or 'maintenance', including, for example, framing, flow control (i.e. XON and XOFF), each occurrence of a BREAK condition, locally-processed input, and input sent to all sessions.
INT charPortIndex	1.3.6.1.3.19.2.1.1	INTEGER	read-only	A unique value for each character port. Its value ranges between 1 and the value of charNumber. By convention and if possible, hardware port numbers come first, with a simple, direct mapping. The value for each port must remain constant at least from one re-initialization of the network management agent to the next.
INT charPortInFlowState	1.3.6.1.3.19.2.1.11	INTEGER	read-only	The current operational state of input flow control on the port. 'none' indicates not applicable. 'unknown' indicates this level does not know. 'stop' indicates flow not allowed. 'go' indicates flow allowed.
INT charPortInFlowType	1.3.6.1.3.19.2.1.9	INTEGER	read-write	The port's type of input flow control. 'none' indicates no flow control at this level or below. 'xonXoff' indicates software flow control by recognizing XON and XOFF characters. 'hardware' indicates flow control delegated to the lower level, for example a parallel port. 'ctsRts' and 'dsrDtr' are specific to RS-232-like ports. Although not architecturally pure, they are included here for simplicity's sake.
TIK charPortLastChange	1.3.6.1.3.19.2.1.8	TimeTicks	read-only	The value of sysUpTime at the time the port entered its current operational state. If the current state was entered prior to the last reinitialization of the local network management subsystem, then this object contains a zero value.
STR charPortName	1.3.6.1.3.19.2.1.2	DisplayString	read-write	An administratively assigned name for the port, typically with some local significance.
INT charPortOperStatus	1.3.6.1.3.19.2.1.7	INTEGER	read-only	The port's actual, operational state, independent of flow control. 'up' indicates able to function normally. 'down' indicates inability to function for administrative or operational reasons. 'maintenance' indicates a maintenance mode, exclusive of normal operation, such as running a test. 'absent' indicates that port hardware is not present. 'active' indicates up with a user present (e.g. logged in).
CTR charPortOutCharacters	1.3.6.1.3.19.2.1.14	Counter	read-only	Total number of characters detected as output to the port since system re-initialization and while the port operational state was 'up', 'active', or 'maintenance', including, for example, framing, flow control (i.e. XON and XOFF), each occurrence of a BREAK condition, locally-created output, and output received from all sessions.
INT charPortOutFlowState	1.3.6.1.3.19.2.1.12	INTEGER	read-only	The current operational state of output flow control on the port. 'none' indicates not applicable. 'unknown' indicates this level does not know. 'stop' indicates flow not allowed. 'go' indicates flow allowed.
INT charPortOutFlowType	1.3.6.1.3.19.2.1.10	INTEGER	read-write	The port's type of output flow control. 'none' indicates no flow control at this level or below. 'xonXoff' indicates software flow control by recognizing XON and XOFF characters. 'hardware' indicates flow control delegated to the lower level, for example a parallel port. 'ctsRts' and 'dsrDtr' are specific to RS-232-like ports. Although not architecturally pure, they are included here for simplicy's sake.
INT charPortReset	1.3.6.1.3.19.2.1.5	INTEGER	read-write	A control to force the port into a clean, initial state, both hardware and software, disconnecting all the port's existing sessions. In response to a get-request or get-next-request, the agent always returns 'ready' as the value. Setting the value to 'execute' causes a reset.
INT charPortSessionIndex	1.3.6.1.3.19.2.1.18	INTEGER	read-only	The value of charSessIndex for the port's first or only active session. If the port has no active session, the agent returns the value zero.
INT charPortSessionMaximum	1.3.6.1.3.19.2.1.16	INTEGER	read-write	The maximum number of concurrent sessions allowed on the port. A value of -1 indicates no maximum. Setting the maximum to less than the current number of sessions has unspecified results.
GAU charPortSessionNumber	1.3.6.1.3.19.2.1.17	Gauge	read-only	The number of open sessions on the port that are in the connecting, connected, or disconnecting state.
charPortTable	1.3.6.1.3.19.2		not-accessible	A list of port entries. The number of entries is given by the value of charNumber.
INT charPortType	1.3.6.1.3.19.2.1.3	INTEGER	read-only	The port's type, 'physical' if the port represents an external hardware connector, 'virtual' if it does not.
NUM charSessConnectionId	1.3.6.1.3.19.3.1.9	InstancePointer	read-only	A reference to additional local MIB information. This should be the highest available related MIB, corresponding to charSessProtocol, such as Telnet. For example, the value for a TCP connection (in the absence of a Telnet MIB) is the object identifier of tcpConnState. If an agent is not configured to have such values, the agent returns the object identifier: nullConnectionId OBJECT IDENTIFIER ::= { 0 0 }
charSessEntry	1.3.6.1.3.19.3.1		not-accessible	Status and parameter values for a character port session.
CTR charSessInCharacters	1.3.6.1.3.19.3.1.7	Counter	read-only	This session's subset of charPortInCharacters.
INT charSessIndex	1.3.6.1.3.19.3.1.2	INTEGER	read-only	The session index in the context of the port, a non-zero positive integer. Session indexes within a port need not be sequential. Session indexes may be reused for different ports. For example, port 1 and port 3 may both have a session 2 at the same time. Session indexes may have any valid integer value, with any meaning convenient to the agent implementation.
INT charSessKill	1.3.6.1.3.19.3.1.3	INTEGER	read-write	A control to terminate the session. In response to a get-request or get-next-request, the agent always returns 'ready' as the value. Setting the value to 'execute' causes termination.
INT charSessOperOrigin	1.3.6.1.3.19.3.1.6	INTEGER	read-only	The session's source of establishment.
CTR charSessOutCharacters	1.3.6.1.3.19.3.1.8	Counter	read-only	This session's subset of charPortOutCharacters.
INT charSessPortIndex	1.3.6.1.3.19.3.1.1	INTEGER	read-only	The value of charPortIndex for the port to which this session belongs.
OID charSessProtocol	1.3.6.1.3.19.3.1.5	AutonomousType	read-only	The network protocol over which the session is running. Other OBJECT IDENTIFIER values may be defined elsewhere, in association with specific protocols. However, this document assigns those of known interest as of this writing.
TIK charSessStartTime	1.3.6.1.3.19.3.1.10	TimeTicks	read-only	The value of sysUpTime [3] when the session entered connecting state.
INT charSessState	1.3.6.1.3.19.3.1.4	INTEGER	read-only	The current operational state of the session, disregarding flow control. 'connected' indicates that character data could flow on the network side of session. 'connecting' indicates moving from nonexistent toward 'connected'. 'disconnecting' indicates moving from 'connected' or 'connecting' to nonexistent.
charSessTable	1.3.6.1.3.19.3		not-accessible	A list of port session entries.
protocolLat	1.3.6.1.3.19.4.4
protocolOther	1.3.6.1.3.19.4.1
protocolRlogin	1.3.6.1.3.19.4.3
protocolTelnet	1.3.6.1.3.19.4.2
protocolVtp	1.3.6.1.3.19.4.6
protocolX29	1.3.6.1.3.19.4.5
wellKnownProtocols	1.3.6.1.3.19.4

OID symbolic	OID numeric	Type	Access	Description
char	1.3.6.1.3.19
INT charNumber	1.3.6.1.3.19.1	INTEGER	read-only	The number of entries in charPortTable, regardless of their current state.
charPortTable	1.3.6.1.3.19.2		not-accessible	A list of port entries. The number of entries is given by the value of charNumber.
charPortEntry	1.3.6.1.3.19.2.1		not-accessible	Status and parameter values for a character port.
INT charPortIndex	1.3.6.1.3.19.2.1.1	INTEGER	read-only	A unique value for each character port. Its value ranges between 1 and the value of charNumber. By convention and if possible, hardware port numbers come first, with a simple, direct mapping. The value for each port must remain constant at least from one re-initialization of the network management agent to the next.
STR charPortName	1.3.6.1.3.19.2.1.2	DisplayString	read-write	An administratively assigned name for the port, typically with some local significance.
INT charPortType	1.3.6.1.3.19.2.1.3	INTEGER	read-only	The port's type, 'physical' if the port represents an external hardware connector, 'virtual' if it does not.
OID charPortHardware	1.3.6.1.3.19.2.1.4	AutonomousType	read-only	A reference to hardware MIB definitions specific to a physical port's external connector. For example, if the connector is RS-232, then the value of this object refers to a document defining objects specific to RS-232. If an agent is not configured to have such values, the agent returns the object identifier: nullHardware OBJECT IDENTIFIER ::= { 0 0 }
INT charPortReset	1.3.6.1.3.19.2.1.5	INTEGER	read-write	A control to force the port into a clean, initial state, both hardware and software, disconnecting all the port's existing sessions. In response to a get-request or get-next-request, the agent always returns 'ready' as the value. Setting the value to 'execute' causes a reset.
INT charPortAdminStatus	1.3.6.1.3.19.2.1.6	INTEGER	read-write	The port's desired state, independent of flow control. 'enabled' indicates that the port is allowed to pass characters and form new sessions. 'disabled' indicates that the port is allowed to pass characters but not form new sessions. 'off' indicates that the port is not allowed to pass characters or have any sessions. 'maintenance' indicates a maintenance mode, exclusive of normal operation, such as running a test.
INT charPortOperStatus	1.3.6.1.3.19.2.1.7	INTEGER	read-only	The port's actual, operational state, independent of flow control. 'up' indicates able to function normally. 'down' indicates inability to function for administrative or operational reasons. 'maintenance' indicates a maintenance mode, exclusive of normal operation, such as running a test. 'absent' indicates that port hardware is not present. 'active' indicates up with a user present (e.g. logged in).
TIK charPortLastChange	1.3.6.1.3.19.2.1.8	TimeTicks	read-only	The value of sysUpTime at the time the port entered its current operational state. If the current state was entered prior to the last reinitialization of the local network management subsystem, then this object contains a zero value.
INT charPortInFlowType	1.3.6.1.3.19.2.1.9	INTEGER	read-write	The port's type of input flow control. 'none' indicates no flow control at this level or below. 'xonXoff' indicates software flow control by recognizing XON and XOFF characters. 'hardware' indicates flow control delegated to the lower level, for example a parallel port. 'ctsRts' and 'dsrDtr' are specific to RS-232-like ports. Although not architecturally pure, they are included here for simplicity's sake.
INT charPortOutFlowType	1.3.6.1.3.19.2.1.10	INTEGER	read-write	The port's type of output flow control. 'none' indicates no flow control at this level or below. 'xonXoff' indicates software flow control by recognizing XON and XOFF characters. 'hardware' indicates flow control delegated to the lower level, for example a parallel port. 'ctsRts' and 'dsrDtr' are specific to RS-232-like ports. Although not architecturally pure, they are included here for simplicy's sake.
INT charPortInFlowState	1.3.6.1.3.19.2.1.11	INTEGER	read-only	The current operational state of input flow control on the port. 'none' indicates not applicable. 'unknown' indicates this level does not know. 'stop' indicates flow not allowed. 'go' indicates flow allowed.
INT charPortOutFlowState	1.3.6.1.3.19.2.1.12	INTEGER	read-only	The current operational state of output flow control on the port. 'none' indicates not applicable. 'unknown' indicates this level does not know. 'stop' indicates flow not allowed. 'go' indicates flow allowed.
CTR charPortInCharacters	1.3.6.1.3.19.2.1.13	Counter	read-only	Total number of characters detected as input from the port since system re-initialization and while the port operational state was 'up', 'active', or 'maintenance', including, for example, framing, flow control (i.e. XON and XOFF), each occurrence of a BREAK condition, locally-processed input, and input sent to all sessions.
CTR charPortOutCharacters	1.3.6.1.3.19.2.1.14	Counter	read-only	Total number of characters detected as output to the port since system re-initialization and while the port operational state was 'up', 'active', or 'maintenance', including, for example, framing, flow control (i.e. XON and XOFF), each occurrence of a BREAK condition, locally-created output, and output received from all sessions.
INT charPortAdminOrigin	1.3.6.1.3.19.2.1.15	INTEGER	read-write	The administratively allowed origin for establishing session on the port. 'dynamic' allows 'network' or 'local' session establishment. 'none' disallows session establishment.
INT charPortSessionMaximum	1.3.6.1.3.19.2.1.16	INTEGER	read-write	The maximum number of concurrent sessions allowed on the port. A value of -1 indicates no maximum. Setting the maximum to less than the current number of sessions has unspecified results.
GAU charPortSessionNumber	1.3.6.1.3.19.2.1.17	Gauge	read-only	The number of open sessions on the port that are in the connecting, connected, or disconnecting state.
INT charPortSessionIndex	1.3.6.1.3.19.2.1.18	INTEGER	read-only	The value of charSessIndex for the port's first or only active session. If the port has no active session, the agent returns the value zero.
charSessTable	1.3.6.1.3.19.3		not-accessible	A list of port session entries.
charSessEntry	1.3.6.1.3.19.3.1		not-accessible	Status and parameter values for a character port session.
INT charSessPortIndex	1.3.6.1.3.19.3.1.1	INTEGER	read-only	The value of charPortIndex for the port to which this session belongs.
INT charSessIndex	1.3.6.1.3.19.3.1.2	INTEGER	read-only	The session index in the context of the port, a non-zero positive integer. Session indexes within a port need not be sequential. Session indexes may be reused for different ports. For example, port 1 and port 3 may both have a session 2 at the same time. Session indexes may have any valid integer value, with any meaning convenient to the agent implementation.
INT charSessKill	1.3.6.1.3.19.3.1.3	INTEGER	read-write	A control to terminate the session. In response to a get-request or get-next-request, the agent always returns 'ready' as the value. Setting the value to 'execute' causes termination.
INT charSessState	1.3.6.1.3.19.3.1.4	INTEGER	read-only	The current operational state of the session, disregarding flow control. 'connected' indicates that character data could flow on the network side of session. 'connecting' indicates moving from nonexistent toward 'connected'. 'disconnecting' indicates moving from 'connected' or 'connecting' to nonexistent.
OID charSessProtocol	1.3.6.1.3.19.3.1.5	AutonomousType	read-only	The network protocol over which the session is running. Other OBJECT IDENTIFIER values may be defined elsewhere, in association with specific protocols. However, this document assigns those of known interest as of this writing.
INT charSessOperOrigin	1.3.6.1.3.19.3.1.6	INTEGER	read-only	The session's source of establishment.
CTR charSessInCharacters	1.3.6.1.3.19.3.1.7	Counter	read-only	This session's subset of charPortInCharacters.
CTR charSessOutCharacters	1.3.6.1.3.19.3.1.8	Counter	read-only	This session's subset of charPortOutCharacters.
NUM charSessConnectionId	1.3.6.1.3.19.3.1.9	InstancePointer	read-only	A reference to additional local MIB information. This should be the highest available related MIB, corresponding to charSessProtocol, such as Telnet. For example, the value for a TCP connection (in the absence of a Telnet MIB) is the object identifier of tcpConnState. If an agent is not configured to have such values, the agent returns the object identifier: nullConnectionId OBJECT IDENTIFIER ::= { 0 0 }
TIK charSessStartTime	1.3.6.1.3.19.3.1.10	TimeTicks	read-only	The value of sysUpTime [3] when the session entered connecting state.
wellKnownProtocols	1.3.6.1.3.19.4
protocolOther	1.3.6.1.3.19.4.1
protocolTelnet	1.3.6.1.3.19.4.2
protocolRlogin	1.3.6.1.3.19.4.3
protocolLat	1.3.6.1.3.19.4.4
protocolX29	1.3.6.1.3.19.4.5
protocolVtp	1.3.6.1.3.19.4.6

AutonomousType (2)
OID charPortHardware	1.3.6.1.3.19.2.1.4	AutonomousType	read-only	A reference to hardware MIB definitions specific to a physical port's external connector. For example, if the connector is RS-232, then the value of this object refers to a document defining objects specific to RS-232. If an agent is not configured to have such values, the agent returns the object identifier: nullHardware OBJECT IDENTIFIER ::= { 0 0 }
OID charSessProtocol	1.3.6.1.3.19.3.1.5	AutonomousType	read-only	The network protocol over which the session is running. Other OBJECT IDENTIFIER values may be defined elsewhere, in association with specific protocols. However, this document assigns those of known interest as of this writing.
Counter (4)
CTR charPortInCharacters	1.3.6.1.3.19.2.1.13	Counter	read-only	Total number of characters detected as input from the port since system re-initialization and while the port operational state was 'up', 'active', or 'maintenance', including, for example, framing, flow control (i.e. XON and XOFF), each occurrence of a BREAK condition, locally-processed input, and input sent to all sessions.
CTR charPortOutCharacters	1.3.6.1.3.19.2.1.14	Counter	read-only	Total number of characters detected as output to the port since system re-initialization and while the port operational state was 'up', 'active', or 'maintenance', including, for example, framing, flow control (i.e. XON and XOFF), each occurrence of a BREAK condition, locally-created output, and output received from all sessions.
CTR charSessInCharacters	1.3.6.1.3.19.3.1.7	Counter	read-only	This session's subset of charPortInCharacters.
CTR charSessOutCharacters	1.3.6.1.3.19.3.1.8	Counter	read-only	This session's subset of charPortOutCharacters.
DisplayString (1)
STR charPortName	1.3.6.1.3.19.2.1.2	DisplayString	read-write	An administratively assigned name for the port, typically with some local significance.
Gauge (1)
GAU charPortSessionNumber	1.3.6.1.3.19.2.1.17	Gauge	read-only	The number of open sessions on the port that are in the connecting, connected, or disconnecting state.
InstancePointer (1)
NUM charSessConnectionId	1.3.6.1.3.19.3.1.9	InstancePointer	read-only	A reference to additional local MIB information. This should be the highest available related MIB, corresponding to charSessProtocol, such as Telnet. For example, the value for a TCP connection (in the absence of a Telnet MIB) is the object identifier of tcpConnState. If an agent is not configured to have such values, the agent returns the object identifier: nullConnectionId OBJECT IDENTIFIER ::= { 0 0 }
INTEGER (18)
INT charNumber	1.3.6.1.3.19.1	INTEGER	read-only	The number of entries in charPortTable, regardless of their current state.
INT charPortAdminOrigin	1.3.6.1.3.19.2.1.15	INTEGER	read-write	The administratively allowed origin for establishing session on the port. 'dynamic' allows 'network' or 'local' session establishment. 'none' disallows session establishment.
INT charPortAdminStatus	1.3.6.1.3.19.2.1.6	INTEGER	read-write	The port's desired state, independent of flow control. 'enabled' indicates that the port is allowed to pass characters and form new sessions. 'disabled' indicates that the port is allowed to pass characters but not form new sessions. 'off' indicates that the port is not allowed to pass characters or have any sessions. 'maintenance' indicates a maintenance mode, exclusive of normal operation, such as running a test.
INT charPortIndex	1.3.6.1.3.19.2.1.1	INTEGER	read-only	A unique value for each character port. Its value ranges between 1 and the value of charNumber. By convention and if possible, hardware port numbers come first, with a simple, direct mapping. The value for each port must remain constant at least from one re-initialization of the network management agent to the next.
INT charPortInFlowState	1.3.6.1.3.19.2.1.11	INTEGER	read-only	The current operational state of input flow control on the port. 'none' indicates not applicable. 'unknown' indicates this level does not know. 'stop' indicates flow not allowed. 'go' indicates flow allowed.
INT charPortInFlowType	1.3.6.1.3.19.2.1.9	INTEGER	read-write	The port's type of input flow control. 'none' indicates no flow control at this level or below. 'xonXoff' indicates software flow control by recognizing XON and XOFF characters. 'hardware' indicates flow control delegated to the lower level, for example a parallel port. 'ctsRts' and 'dsrDtr' are specific to RS-232-like ports. Although not architecturally pure, they are included here for simplicity's sake.
INT charPortOperStatus	1.3.6.1.3.19.2.1.7	INTEGER	read-only	The port's actual, operational state, independent of flow control. 'up' indicates able to function normally. 'down' indicates inability to function for administrative or operational reasons. 'maintenance' indicates a maintenance mode, exclusive of normal operation, such as running a test. 'absent' indicates that port hardware is not present. 'active' indicates up with a user present (e.g. logged in).
INT charPortOutFlowState	1.3.6.1.3.19.2.1.12	INTEGER	read-only	The current operational state of output flow control on the port. 'none' indicates not applicable. 'unknown' indicates this level does not know. 'stop' indicates flow not allowed. 'go' indicates flow allowed.
INT charPortOutFlowType	1.3.6.1.3.19.2.1.10	INTEGER	read-write	The port's type of output flow control. 'none' indicates no flow control at this level or below. 'xonXoff' indicates software flow control by recognizing XON and XOFF characters. 'hardware' indicates flow control delegated to the lower level, for example a parallel port. 'ctsRts' and 'dsrDtr' are specific to RS-232-like ports. Although not architecturally pure, they are included here for simplicy's sake.
INT charPortReset	1.3.6.1.3.19.2.1.5	INTEGER	read-write	A control to force the port into a clean, initial state, both hardware and software, disconnecting all the port's existing sessions. In response to a get-request or get-next-request, the agent always returns 'ready' as the value. Setting the value to 'execute' causes a reset.
INT charPortSessionIndex	1.3.6.1.3.19.2.1.18	INTEGER	read-only	The value of charSessIndex for the port's first or only active session. If the port has no active session, the agent returns the value zero.
INT charPortSessionMaximum	1.3.6.1.3.19.2.1.16	INTEGER	read-write	The maximum number of concurrent sessions allowed on the port. A value of -1 indicates no maximum. Setting the maximum to less than the current number of sessions has unspecified results.
INT charPortType	1.3.6.1.3.19.2.1.3	INTEGER	read-only	The port's type, 'physical' if the port represents an external hardware connector, 'virtual' if it does not.
INT charSessIndex	1.3.6.1.3.19.3.1.2	INTEGER	read-only	The session index in the context of the port, a non-zero positive integer. Session indexes within a port need not be sequential. Session indexes may be reused for different ports. For example, port 1 and port 3 may both have a session 2 at the same time. Session indexes may have any valid integer value, with any meaning convenient to the agent implementation.
INT charSessKill	1.3.6.1.3.19.3.1.3	INTEGER	read-write	A control to terminate the session. In response to a get-request or get-next-request, the agent always returns 'ready' as the value. Setting the value to 'execute' causes termination.
INT charSessOperOrigin	1.3.6.1.3.19.3.1.6	INTEGER	read-only	The session's source of establishment.
INT charSessPortIndex	1.3.6.1.3.19.3.1.1	INTEGER	read-only	The value of charPortIndex for the port to which this session belongs.
INT charSessState	1.3.6.1.3.19.3.1.4	INTEGER	read-only	The current operational state of the session, disregarding flow control. 'connected' indicates that character data could flow on the network side of session. 'connecting' indicates moving from nonexistent toward 'connected'. 'disconnecting' indicates moving from 'connected' or 'connecting' to nonexistent.
TimeTicks (2)
TIK charPortLastChange	1.3.6.1.3.19.2.1.8	TimeTicks	read-only	The value of sysUpTime at the time the port entered its current operational state. If the current state was entered prior to the last reinitialization of the local network management subsystem, then this object contains a zero value.
TIK charSessStartTime	1.3.6.1.3.19.3.1.10	TimeTicks	read-only	The value of sysUpTime [3] when the session entered connecting state.
No type (12)
char	1.3.6.1.3.19
charPortEntry	1.3.6.1.3.19.2.1		not-accessible	Status and parameter values for a character port.
charPortTable	1.3.6.1.3.19.2		not-accessible	A list of port entries. The number of entries is given by the value of charNumber.
charSessEntry	1.3.6.1.3.19.3.1		not-accessible	Status and parameter values for a character port session.
charSessTable	1.3.6.1.3.19.3		not-accessible	A list of port session entries.
protocolLat	1.3.6.1.3.19.4.4
protocolOther	1.3.6.1.3.19.4.1
protocolRlogin	1.3.6.1.3.19.4.3
protocolTelnet	1.3.6.1.3.19.4.2
protocolVtp	1.3.6.1.3.19.4.6
protocolX29	1.3.6.1.3.19.4.5
wellKnownProtocols	1.3.6.1.3.19.4

RFC description

Character stream device management MIB for port configuration and status monitoring.

Start monitoring Terminal servers / character-oriented serial port devices with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CHAR-MIB

This MIB depends on

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What Is CHAR-MIB?

What Can Be Monitored

Supported Devices

Monitoring Examples

RFC description