10/100BASE-T SFPNOKIA 474902A.101 Compatible 25G SFP28 LR Transceiver Module
The 474902A.101 compatible module serves equipment requiring a 25G SFP28 interface with 1310nm optics and a 10km rating. Connection is through Duplex LC. Product data, application guidance and factory verification are presented together to support high-density deployments balance optical performance, port access and thermal planning.
OEM Part Number: 474902A.101HT Part Number: SFP-25GLR-31-I
Product Highlights
- Compatible alternative to NOKIA 474902A.101
- 25G connectivity at 25.78Gbps
- Optical wavelength: 1310nm
- Specified reach: 10km
- Duplex LC / SMF interface
- Digital diagnostic monitoring: Supported
- Operating temperature: -40 to 85°C (-40 to 185°F)
Specifications
| NOKIA Compatible | 474902A.101 |
|---|---|
| Manufacturer | HT |
| HT Part Number | SFP-25GLR-31-I |
| Form Factor | SFP28 |
| Max Data Rate | 25.78Gbps |
| Wavelength | 1310nm |
| Max Cable Distance | 10km |
| Connector | Duplex LC |
| Media | SMF |
| Transmitter Type | DFB 1310nm |
| Receiver Type | PIN |
| TX Power | -4~2dBm |
| Receiver Sensitivity | <-12dBm |
| Power Budget | 8dB |
| Receiver Overload | 2dBm |
| Power Consumption | ≤1.2W |
| Extinction Ratio | 2.7dB |
| DDM/DOM | Supported |
| Industrial Temperature Range | -40 to 85°C (-40 to 185°F) |
| CDR | TX & RX Built-in CDR |
| FEC Function | Not Support |
| Protocols | SFF-8472, SFF-8402, SFF-8432, SFF-8431, CEI-28G-VSR |
| Core Size | G.652 |
| Packaging Technology | BOX Packaging |
Applications and Optical Link Design
Use this module for equipment interconnection over the specified single-mode fiber plant, including enterprise backbone, campus, metro or data-center interconnect links according to its rated distance. Confirm that both ends use the same optical standard and wavelength plan, and allow for connector, splice and patch-panel loss within the stated power budget.
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.
Before commissioning, measure the complete single-mode channel against the stated budget for 10km. Inspect every Duplex LC connection and record diagnostic power where supported. Both ends must agree on rate, wavelength and optical standard.
Quality Assurance and Packaging
Quality control covers the optical or electrical interface, host identification and operating link. The verified unit is then individually protected and cartoned. 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 -4~2dBm; receiver sensitivity is <-12dBm; the stated optical power budget is 8dB. A sound acceptance record includes link state, diagnostic temperature, supply voltage and transmit or receive levels where the host exposes them. Compare the readings with the stated ranges rather than treating any received light as proof of adequate margin. Persistent alarms or borderline values should trigger an end-face and complete-channel inspection. Diagnostic monitoring is listed as Supported. 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 25.78Gbps, wavelength 1310nm, rated reach 10km.
Ordering Information
Quote HT part number SFP-25GLR-31-I together with OEM reference 474902A.101 and quantity. Add the host model and software release when pre-order verification is required. Neutral labels, customer packaging and project-specific compatibility review are available on request.
NOKIA Compatibility and Factory Testing
Factory verification starts with the expected 474902A.101 identity and finishes with an operating host link. EEPROM data, diagnostic visibility and the stated optical parameters are assessed together. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.
Frequently Asked Questions
Is this an original NOKIA transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies 474902A.101, not an original NOKIA-branded module.
Which fiber and connector are required?
Use Duplex LC with SMF. The specified maximum reach is 10km, 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.
