All MIBs › MERIDIAN2-MIB › gntpTimeFigureOfMerit
gntpTimeFigureOfMerit
Module: MERIDIAN2-MIB
OID (symbolic): MERIDIAN2-MIB::gntpTimeFigureOfMerit
OID (numeric): 1.3.6.1.4.1.13827.14.1.11
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-only
Description: The Time Figure of Merit (TFOM) value ranges from 3 to 9 and indicates the current estimate of the worst case time error. It is a logarithmic scale, with each increment indicating a tenfold increase in the worst case time error boundaries.
The scale is referenced to a worst case time error of 100 picoseconds, equivalent to a TFOM of zero. During normal locked operation with GPS the TFOM is 3 and implies a worst case time error of 100 nanoseconds.
During periods of signal loss, the GPS sub-system will compute an extrapolated worst case time error. One hour after the worst case time error has reached the value equivalent to a TFOM of TFOM Fault Level, the NTP server will cease to send stratum 1 reply packets and an Alarm LED will be energized.
What is gntpTimeFigureOfMerit?
The current NTP-side Time Figure of Merit (TFOM), a logarithmic code from 3 (locked to GPS, worst-case error about 100 nanoseconds) up to 9 (worst-case error over 10 milliseconds); each step is a tenfold jump in the estimated worst-case time error. If GPS is lost, this value rises as the server coasts on its internal oscillator, and once it reaches the configured TFOM Fault Level for a full hour the server stops claiming stratum 1 accuracy and lights the Alarm LED.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.13827.14.1.11 snmpwalk -v2c -c public <target> MERIDIAN2-MIB::gntpTimeFigureOfMerit
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.13827.14.1.11.1 snmpget -v2c -c public <target> MERIDIAN2-MIB::gntpTimeFigureOfMerit.1
Start monitoring EndRun Technologies Meridian II GPS-disciplined time/frequency reference with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the MERIDIAN2-MIB::gntpTimeFigureOfMerit OID value, configure state conditions and alerts, and monitor any EndRun Technologies Meridian II GPS-disciplined time/frequency reference from a single console.
OID Breakdown
Upper-level ancestors (7 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.13827 | endRunTechnologiesMIB | ENDRUNTECHNOLOGIES-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.13827.14 | meridian2GPS | MERIDIAN2-MIB |
| 1.3.6.1.4.1.13827.14.1 | gntp | MERIDIAN2-MIB |
| 1.3.6.1.4.1.13827.14.1.11 | gntpTimeFigureOfMerit | MERIDIAN2-MIB |