SIEMENS-PN-MIB

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › SIEMENS-PN-MIB

Organization: Siemens AG, Dept. PN

Last Updated: 2001-01-03

Category: Security and Access Control, Siemens Enterprise

Description: Manages Siemens PROFINET device configuration, port status, and industrial Ethernet topology.

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What Is SIEMENS-PN-MIB?

Despite its PROFINET-sounding name, the module description and sample objects show this MIB actually covers Siemens Hicom 300 PBX and UNITY telephony switching systems, placing it in Siemens's enterprise telecom (private branch exchange) product line rather than industrial Ethernet. It exposes system topology information, records of system changes, and management data for both local and foreign (interconnected) Hicom systems, alongside alarm records and alarm filtering configuration. Its monitoring focus is clearly on hardware and software status of the PBX platform: it tracks system change events, subagent message/error text and numbers for diagnostics, active alarms with severity and mirrored/uploaded alarm history, making it well suited to detecting PBX faults, subagent errors, or configuration drift across interconnected switches. It relies on the Siemens enterprise SMI ("sni"/"siemensUnits") OID hierarchy for its registration but does not appear to depend on other standards-based telecom MIBs. It would be deployed in enterprise telephony environments running Siemens Hicom 300/UNITY PBX systems where operators need centralized alarm and system-change visibility across multiple interconnected switches. Engineers can download the SIEMENS-PN-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in SIEMENS-PN-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

  • Siemens Hicom 300 PBX
  • Siemens UNITY telephony system

Monitoring Examples

The hicomAlTable and hicomAlFiltConfTable expose active alarms and their filtering configuration, letting an administrator poll for currently raised alarms and their configured severity thresholds across the PBX. The hicomSysTable and hicomForeignSysTable track topology for the local system and any interconnected foreign Hicom systems, while hicomSysSubagentLastMsgNo and hicomSysSubagentLastMsgText expose the most recent internal subagent diagnostic message, useful for catching a subagent fault before it causes a wider outage. hicomSystemChanges and hicomAlarmsChanges act as change counters an NMS can poll to detect when new alarms or system topology changes have occurred without re-walking the full tables.

What Can Be Monitored

  • active PBX alarms and severity
  • alarm filter configuration
  • system topology changes
  • foreign/interconnected system table
  • subagent diagnostic message text
  • alarm change/event counters
Imported Objects

From RFC1155-SMI

enterprises

From SNMPv2-CONF

OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION
TestAndIncr

How to Use in IPNetwork Monitor

Example using hicomSystemChanges OID:

Select a Siemens Hicom 300 PBX, Siemens UNITY telephony system (topology/alarm/system-change status) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type hicomSystemChanges into the Find box to locate it in the OID tree, then select it and click OK. It reports the when a change (SET) is made on hicomSysTable or hicomForeignSysTable, the variable is incremented by one. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Siemens PBX and UNITY systems MIB for topology management, alarm handling, and hardware/software inventory.

Start monitoring Siemens Hicom 300 PBX, Siemens UNITY telephony system (topology/alarm/system-change status) 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 SIEMENS-PN-MIB