IMDM-MIB

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Category: Device Management, Domain: WAN

Description: MIB for Intelligent Modem/Device Manager (IMDM) providing dial-up modem bank configuration and call status monitoring.

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What Is IMDM-MIB?

IMDM-MIB is a vendor private MIB (associated with the "usr"/"nas" object identifiers, consistent with US Robotics/3Com Total Control-style Network Access Server equipment) for an Intelligent Modem/Device Manager, managing banks of dial-up/ISDN modem or terminal adapter cards used for remote access. It exposes per-call configuration and status objects organized in a call-control table covering rate adaptation (V.110), fixed and negotiated network rates, link delay, analog/digital override settings, asynchronous PPP, and X.75/Star protocol modes. For monitoring purposes it is used to check the software/protocol state of each modem/channel's active call, confirming negotiated connection rate and protocol mode per channel, which reveals call setup failures or rate mismatches on a dial-up access bank, functioning as a call/session status indicator rather than exposing classic hardware sensors. It sits within a vendor-specific enterprise MIB tree rather than depending on standard IETF MIBs. It is typically deployed on remote access server (RAS) chassis providing large banks of dial-up modem or ISDN channels for dial-in internet/remote access services. Engineers can download the IMDM-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in IMDM-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.

Supported Devices

Remote Access Server (RAS) / dial-up modem bank chassis (US Robotics/3Com Total Control-style NAS)

Monitoring Examples

An operator polling imdmCcTable/imdmCcEntry by imdmCcIndex (per channel/call) can inspect imdmCcNetworkRate and imdmCcFixedNtwkRate to confirm a call negotiated at its expected rate, or imdmCcRateAdapV110 to check V.110 rate adaptation mode for a given connection. imdmCcBcLinkDly reveals abnormal link delay on a channel, and imdmCcX75/imdmCcStarV2/imdmCcStarU1 flags indicate which signaling protocol variant is in use for that call, helping diagnose interoperability issues between the RAS and dial-in clients.

What Can Be Monitored

per-channel call/network rate
V.110 rate adaptation status
link delay per channel
analog/digital override mode
async PPP mode
X.75/Star signaling protocol mode

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge
IpAddress
TimeTicks
enterprises
experimental

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
usr	1.3.6.1.4.1.429
nas	1.3.6.1.4.1.429.1
imdm	1.3.6.1.4.1.429.1.19
imdmCc	1.3.6.1.4.1.429.1.19.1
imdmCcTable	1.3.6.1.4.1.429.1.19.1.1		not-accessible	A table containing the call control parameters for each modem in the chassis.
imdmCcEntry	1.3.6.1.4.1.429.1.19.1.1.1		not-accessible	Call control parameters for an ISDN modem. These define the sequence of operation related to how a call is negotiated.
INT imdmCcIndex	1.3.6.1.4.1.429.1.19.1.1.1.1	INTEGER	read-only	The index which uniquely identifies the modem to which this entry is applicable. The value corresponds to the value of the index to the entity table in the chassis MIB that corresponds to the same modem.
INT imdmCcRateAdapV110	1.3.6.1.4.1.429.1.19.1.1.1.2	INTEGER	read-write	This object enables V110 rate adaption corresponds to S register S67 bit 0. Default = enable(2).
INT imdmCcFixedNtwkRate	1.3.6.1.4.1.429.1.19.1.1.1.3	INTEGER	read-write	This object sets the fixed network rate. This object correspond to S register S67 bit 1. Default = 1
INT imdmCcNetworkRate	1.3.6.1.4.1.429.1.19.1.1.1.4	INTEGER	read-write	This object sets the Network rate speed. This object corresponds to the modem S register S67 bit 2. Default = 1
INT imdmCcBcLinkDly	1.3.6.1.4.1.429.1.19.1.1.1.5	INTEGER	read-write	This object enable a 45 - 65 second link delay. This object corresponds to the S register S67 bit 4. Default = 1
INT imdmCcAnlgOvrDig	1.3.6.1.4.1.429.1.19.1.1.1.6	INTEGER	read-write	This object is used to set S register S68 bit 0 which, does not allow analog calls over digital data connection. Default = 1
INT imdmCcAsyncPPP	1.3.6.1.4.1.429.1.19.1.1.1.7	INTEGER	read-write	This object is used to disable/enable async PPP/ sync PPP conversion. This object corresponds to S register S68 bit 2. Default = enable(1).
INT imdmCcX75	1.3.6.1.4.1.429.1.19.1.1.1.8	INTEGER	read-write	This object is used to disable/enable X75. This object corresponds to S register S68 bit 3. Default = 1
INT imdmCcStarV2	1.3.6.1.4.1.429.1.19.1.1.1.9	INTEGER	read-write	This object is used to set the data mode of the modem and is equivalent to *V2 = x AT command. Default =1
INT imdmCcStarU1	1.3.6.1.4.1.429.1.19.1.1.1.10	INTEGER	read-write	This object is used to set the originate HDLC protocols of the modem and is equivalent to *U1 = x AT command. Default =2
INT imdmCcStarU2	1.3.6.1.4.1.429.1.19.1.1.1.11	INTEGER	read-write	This object is used to set the originate Non-HDLC protocols of the modem and is equivalent to *U2 = x AT command. Default =1
INT imdmCcStarU3	1.3.6.1.4.1.429.1.19.1.1.1.12	INTEGER	read-write	This object is used to set the originate Analog modem/fax data mode of the modem and is equivalent to *U3 = x AT command. Default =2
INT imdmCcV120	1.3.6.1.4.1.429.1.19.1.1.1.13	INTEGER	read-write	This Object is used to Enable/Disable V120. This Object corresponds to S register 68 bit 4 default=1
INT imdmCcFrameSize	1.3.6.1.4.1.429.1.19.1.1.1.14	INTEGER	read-write	This Object is used to set the Frame size for X75. Default = 2048
INT imdmCcWindowSize	1.3.6.1.4.1.429.1.19.1.1.1.15	INTEGER	read-write	This Object is used to set the Window Size of X75 default=2
imdmLi	1.3.6.1.4.1.429.1.19.2
imdmLiTable	1.3.6.1.4.1.429.1.19.2.1		not-accessible	A list of configurable Line Interface objects for a modem. The number of table entries is given by modem Number.
imdmLiEntry	1.3.6.1.4.1.429.1.19.2.1.1		not-accessible	Objects which define the line interface characteristics for a particular modem.
INT imdmLiIndex	1.3.6.1.4.1.429.1.19.2.1.1.1	INTEGER	read-only	Index into the Line Interface table. This index is the value from the chassis mib entity relation table that is applicable for a particular modem.
INT imdmLiConnTypeToCo	1.3.6.1.4.1.429.1.19.2.1.1.2	INTEGER	read-write	This object is used to set the type of switch your telephone company Cental Office is using. This object coressponds with the *M AT modem command.
STR imdmLiDN	1.3.6.1.4.1.429.1.19.2.1.1.3	DisplayString	read-write	This object is to set the Directory Number (DN) that is assigned by the telephone company. This object corresponds to the *P AT modem command.
STR imdmLiSPID	1.3.6.1.4.1.429.1.19.2.1.1.4	DisplayString	read-write	This object is to set the Service Profile ID (SPID) that is assigned by the telephone company. This object corresponds to the *S AT modem command.
INT imdmLiTermEndPointID	1.3.6.1.4.1.429.1.19.2.1.1.5	INTEGER	read-write	This object is to set the Terminal Endpoint ID (TEI) that is assigned by the telephone company. This object corresponds to the *T AT modem command.
INT imdmLiProtTypeSw	1.3.6.1.4.1.429.1.19.2.1.1.6	INTEGER	read-write	This object is to set the Switch Protocol that the telephone company uses. This object corresponds to the *W AT modem command.

RFC description

3Com ISDN Intelligent Modem (I-Modem) call control and configuration management for modem parameters and call negotiation.

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Download IMDM-MIB

What Is IMDM-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description