10/100BASE-T SFPH3C SFP1G-SX-31-I Compatible 1G SFP Transceiver Module
Built for hosts recognizing SFP1G-SX-31-I, this HT-manufactured SFP module delivers 1G transmission at 1310nm. Its rated reach is 2km, with Duplex LC as the physical interface. The specifications and engineering guidance below support high-density deployments balance optical performance, port access and thermal planning, while keeping HT manufacture separate from the OEM cross-reference.
OEM Part Number: SFP1G-SX-31-IHT Part Number: SFP1G-SX-31-I
Product Highlights
- Compatible alternative to H3C SFP1G-SX-31-I
- 1G connectivity at 1.25Gbps
- Optical wavelength: 1310nm
- Specified reach: 2km
- Duplex LC / SMF/MMF interface
- Operating temperature: -40 to 85°C (-40 to 185°F)
- Factory compatibility verification and optical performance testing before shipment
Specifications
| HT Part Number | SFP1G-SX-31-I |
|---|---|
| Manufacturer | HT |
| Form Factor | SFP |
| Max. Data Rate | 1.25Gbps |
| Connector | Duplex LC |
| Max. Cable Distance | 2km |
| Media | SMF/MMF |
| Wavelength | 1310nm |
| Modulation | NRZ |
| Power Consumption | < 1W |
| Transmitter Type | FP |
| Receiver Type | PIN-TIA |
| TX Power | -9~-3dbm |
| Receiver Sensitivity | < -21dBm |
| BER | 1E-12 |
| DOM Support | Yes |
| Protocols | SFF-8472MSAIEEE 802.3 |
| Industrial Temperature Range | -40 to 85°C (-40 to 185°F) |
Applications and Optical Link Design
Typical deployments include switch-to-switch, switch-to-server and aggregation links inside a data hall or between adjacent equipment rooms. The Duplex LC interface connects to the specified multimode cabling, and the stated reach depends on fiber grade and link loss. Keep this interface on the matching multimode optical standard rather than connecting it directly to a single-mode wavelength or reach variant.
The industrial temperature rating makes this version appropriate for controlled outdoor cabinets, transport nodes and other installations exposed to wider ambient temperature variation. Adequate airflow, protected cable routing and host-platform temperature limits still apply.
The multimode channel should use the fiber grade associated with the stated 2km reach. Keep the Duplex LC end faces clean and avoid tight bends. Different multimode standards are not interchangeable merely because they share a connector.
Quality Assurance and Packaging
Each SFP1G-SX-31-I compatible module is inspected, powered up and functionally checked before protective packing. Dust caps and individual trays shield the interface during transport. Customer references, rack groups and project packing lists can be added for volume orders.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is -9~-3dbm; receiver sensitivity is < -21dBm. Digital diagnostics make later maintenance easier when baseline values are captured at installation. Save the initial readings with the port and OEM reference, then investigate meaningful changes rather than reacting to a single transient value. Diagnostic support depends on the host as well as the module, so unavailable fields should be confirmed with the platform documentation. Before every insertion, keep dust caps in place until the patch lead is ready, avoid touching the optical end face and use an appropriate inspection and cleaning procedure. Do not look into an active optical interface.
High-Density Port and Thermal Planning
In a densely populated chassis, connector access and airflow form part of the optical-link design. Confirm that neighboring modules and patch leads leave room for latch operation, and include listed power consumption in the host thermal budget. Assess port density together with fiber management. For this model, the principal parameters are data rate 1.25Gbps, wavelength 1310nm, rated reach 2km.
Ordering Information
Use SFP1G-SX-31-I as the compatibility cross-reference and SFP1G-SX-31-I as the HT ordering identity. Keep other reaches or wavelength directions on separate order lines. Neutral labels, customer packaging and project-specific compatibility review are available on request.
H3C Compatibility and Factory Testing
Compatibility testing for SFP1G-SX-31-I combines identification with a live link and available transmit, receive and alarm information. Connector condition is inspected separately. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.
Frequently Asked Questions
Is this an original H3C transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies SFP1G-SX-31-I, not an original H3C-branded module.
Which fiber and connector are required?
Use Duplex LC with SMF/MMF. The specified maximum reach is 2km, subject to fiber quality and total link loss.
Can it be mixed with another wavelength or reach version?
Only when the two ends share the same optical standard, wavelength plan and supported data rate. Check the exact part numbers and link budget rather than relying only on the module form factor.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.
