Seven minutes remaining, a three-minute outage and a two-minute reserve defined the alert
RFC 1628 separates estimated remaining time from elapsed seconds on battery, which permits a monitoring record to reconstruct what the UPS knew during an outage. Equipment record: XPC SNMP-2PG1, companion identifier upsSecondsOnBattery.0. Decision: Escalate a depleted-battery alert only after a live read-only walk confirms the installed card exposes the required RFC 1628 values and the scaled readings reconcile into one synchronized outage timeline.
One outage, three battery objects
A depleted-battery alert without a timeline cannot distinguish a long outage from a weak string, a late poll or a reset card. The event record needs the input-loss time, first battery sample, remaining-time trend, low-battery transition, restoration and post-event recharge or test.
For XPC SNMP-2PG1, the applicability boundary is anchored to 3 battery OIDs, 3 battery OIDs and part upsSecondsOnBattery.0. The 5 worked inputs remain assumptions until they are recorded at the equipment.
Confirm availability and catalogue details for XPC SNMP-2PG1 or upsSecondsOnBattery.0 on the UPS selection and battery help centre page.
Figure 1. XPC SNMP-2PG1 equipment and power path
Minutes remaining and seconds elapsed
The controlling numerical record is: Worked initial remaining time: 7 min; Worked outage duration: 180 s; Required remaining reserve: 120 s; Polling interval: 30 s; Samples across three minutes: 6 outage samples; Status, remaining time and seconds-on-battery: 3 battery OIDs. Each value has a defined source or assumption status in the engineering ledger. Values from different configurations are not combined as though they came from one installed system.
| Engineering parameter | Value | Evidence status |
|---|---|---|
| Worked initial remaining time | 7 min | Worked design assumption |
| Worked outage duration | 180 s | Worked design assumption |
| Required remaining reserve | 120 s | Worked design assumption |
| Polling interval | 30 s | Worked design assumption |
| Samples across three minutes | 6 outage samples | Worked design assumption |
| Status, remaining time and seconds-on-battery | 3 battery OIDs | Standards-defined value |
An initial seven-minute estimate is 420 seconds. After a 180-second outage, a simple time budget leaves 240 seconds. Preserving a 120-second reserve leaves another 120 seconds of margin before the worked escalation threshold. Actual estimates need not fall linearly, so the recorded OID trend remains controlling.
A 120-second reserve after a three-minute outage
The worked check uses worked margin = 420 s initial – 180 s outage – 120 s reserve. With seven minutes initial remaining time, a three-minute outage and a two-minute reserve, the result is 120 seconds of margin. A reported remaining time below the reserve, or a faster-than-time decline, opens a battery-condition investigation. The arithmetic is reproducible, but it remains a design check until the listed inputs are confirmed at the equipment.
The 120 seconds of margin result follows from worked margin = 420 s initial – 180 s outage – 120 s reserve. If the 7 min input changes, this check is repeated rather than carrying the earlier result into a different operating state.
Figure 2. Quantified basis for the XPC SNMP-2PG1 decision
Separating outage duration from battery weakness
The card and monitoring platform clocks must agree before event order is inferred. A 90-second clock offset can make restoration appear to precede a low-battery transition or can inflate the apparent response delay.
Seconds-on-battery proves elapsed outage exposure while estimated minutes remaining is a model output influenced by load and battery state. Divergence between the two values is diagnostic information; it is not corrected by manually forcing a smooth line.
Post-event work records recharge state, battery age, temperature, self-test and any approved loaded test. One long outage can fully explain depletion, while repeated short outages with rapidly falling estimates can point to a weak battery or charger condition.
| Path | Technical consequence | Disposition |
|---|---|---|
| Apply the stated engineering decision | Escalate a depleted-battery alert only after a live read-only walk confirms the installed card exposes the required RFC 1628 values and the scaled readings reconcile into one synchronized outage timeline. | Selected basis |
| Generic model substitution | Select by family name or rating alone, without confirming the exact configuration. | Not selected on the stated evidence |
| Unverified operating assumption | Treat a design assumption as though it were a site measurement. | Reconsider only if the input changes |
Confirm availability and catalogue details for XPC SNMP-2PG1 or upsSecondsOnBattery.0 on the catalogue of UPS replacement batteries page.
Confirm availability and catalogue details for XPC SNMP-2PG1 or upsSecondsOnBattery.0 on the UPS system catalogue page.
The XPC SNMP-2PG1 decision retains part upsSecondsOnBattery.0, the 120 seconds of margin calculation result and the standards-defined 3 battery OIDs point in one equipment record. Applicable OEM instructions, qualified electrical authority and the installed single-line or wiring record remain controlling for any executable work.
Post-event battery and clock checks
Acceptance of XPC SNMP-2PG1 depends on five recorded checks:
- Export raw SNMP-2PG1 events and the three RFC 1628 battery objects.
- Normalize card, platform and site clocks to one time base.
- Plot all 30-second samples from input loss through restoration.
- Compare elapsed outage with the remaining-time trend and 120-second reserve.
- Record recharge and post-event battery checks before closing the alert.
The XPC SNMP-2PG1 record is not accepted if part upsSecondsOnBattery.0 does not match, the calculation does not reproduce 120 seconds of margin, or the final operating state is not recorded. The equipment returns to the approved safe state when a check stops, and the unresolved condition remains open without an invented repair result.
Figure 3. Verification sequence for XPC SNMP-2PG1
The alert closes only with a reconstructed timeline
The worked timeline retains 120 seconds beyond the required reserve after a three-minute outage. A lower observed value is investigated as battery, load or estimation behaviour; a simple depleted flag is not treated as the diagnosis.
GDF’s UPS service page covers field measurements and service work for XPC SNMP-2PG1.
Decision rule: Escalate a depleted-battery alert only after a live read-only walk confirms the installed card exposes the required RFC 1628 values and the scaled readings reconcile into one synchronized outage timeline. A different model, load, voltage, battery string, software version or operating state requires a new check against the applicable manufacturer record.
Sources
- XPC SNMP-2PG1 compatibility record
- IETF RFC 1628 UPS MIB
- GDF Technologies, internal engineering reference: Monitoring, SNMP & Shutdown/UPS Monitoring Cybersecurity and Network Integration.md
- GDF Technologies, anonymized field-case library, used only where the text identifies a retained field fact.