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Huawei / SFP optical transceivers

Huawei 25G SFP28 10km Equipment information & support

The Huawei 25G SFP28 1310nm 10km (SFP28-25G-LR) is a carrier-grade single-mode optical transceiver engineered for 5G wireless fronthaul and high-density 25GE datacenter fabrics, operating at 1310nm over single-mode fiber up to 10km via duplex LC connectors.

Equipment information

Brand
Huawei
Equipment model
Huawei 25G SFP28 10km
Equipment type
SFP optical transceivers
Controller / software version
Confirm against the installed equipment
View full product specifications
Huawei 25G SFP28 10km Official Product View 1

Information below comes from the current product catalogue. Confirm the controller, software version and configuration of the installed equipment separately.

Physical Form Factor
SFP28
Data Rate
25.78 Gbps
Central Wavelength
1310 nm
Maximum Distance
10 km
Fiber Type
Single-Mode Fiber (SMF) (SMF)
Optical Connector
Duplex LC (blue pull tab)

Alarms & troubleshooting

OPT_LOS (Optical RX Loss of Signal)
Port LINK/ACT LED is OFF; Chassis ALM LED steady amber
Far-end transmitter disabled, fiber cut or excessive macrobending, dirty/damaged LC connector, or RX power below sensitivity threshold (-12.6 dBm).
1. Execute 'display transceiver verbose' to verify Rx Optical Power reading. 2. Measure incoming optical power with an optical power meter at 1310nm (acceptable range: -10.3 to +2.0 dBm). 3. Inspect and clean the LC optical ferrule and SFP28 optical bore using an appropriate lint-free cleaner. 4. If fiber link attenuation and remote transmission are normal, replace the local SFP28 module.
TX_FAULT (Transmitter Hardware Fault)
Port LINK/ACT LED is OFF; Chassis ALM LED steady amber
Internal DFB laser driver circuit failure, laser safety automatic shutdown triggered, or hardware pin Tx_Fault pulled high.
1. Run 'display transceiver interface verbose' to verify Tx Fault status and Tx Power reading. 2. Execute 'shutdown' followed by 'undo shutdown' on the interface to reset the transmitter driver. 3. Reseat the module and inspect edge connector gold fingers for damage, dirt, or short-circuits. 4. If TX_FAULT persists and Tx Power reads -40 dBm, replace the defective SFP28 transceiver.
TRANS_BIAS_HIGH (Laser Bias Current High)
Port LINK/ACT LED is steady green; Chassis ALM LED steady amber
Semiconductor junction degradation of the SFP28 DFB laser; internal APC (Automatic Power Control) circuit continuously increases bias current to maintain target output power, exceeding alarm threshold.
1. Run 'display transceiver verbose' to compare current Tx Bias Current against the High Alarm/Warn threshold. 2. Monitor Tx Output Power to identify optical power degradation or instability. 3. Schedule a planned maintenance window to replace the degraded transceiver before total laser burnout. 4. Verify that the replacement unit matches the required 1310nm 10km 25G LR specifications.
MODULE_TEMP_HIGH (SFP28 Module High Temperature)
Port LINK/ACT LED steady green; Device ALM LED flashing amber
Ambient temperature exceeding 40°C, clogged chassis air filter restricting airflow, fan module failure, or high port packing density causing module internal temperature to exceed 75°C threshold.
1. Run 'display transceiver verbose' and 'display environment' to evaluate module and chassis thermal metrics. 2. Check fan operational status via 'display fan' and clean clogged air intake filters. 3. Verify data center HVAC operation to bring cold-aisle air intake back to 20°C–25°C. 4. If only one module exhibits high temperature while adjacent ports are normal, replace the module to eliminate internal thermistor fault.
FEC_EXCESSIVE_ERR (Excessive Uncorrectable RS-FEC Errors)
Port LINK/ACT LED flashing amber; Chassis ALM LED steady amber
Optical signal-to-noise ratio (OSNR) degradation caused by fiber macrobending/attenuation, scratched LC connectors, chromatic dispersion, or mismatched FEC modes (RS-FEC vs BASE-R FEC vs OFF) between link peers.
1. Execute 'display port fec interface' on both ends to confirm RS-FEC mode is consistently configured. 2. Run 'display interface' to monitor the rate of CRC, symbol, and uncorrectable FEC block errors. 3. Test the optical span with an OTDR/optical power meter to ensure total link loss is under 8.8 dB with no localized macrobend reflections. 4. Clean all optical interconnects; if uncorrectable errors persist, swap patch cables and replace the SFP28 transceiver.

Access Complete Maintenance & Full Alarm Troubleshooting Manual

This page lists high-frequency critical alarm codes commonly encountered in field maintenance. Comprehensive manufacturer troubleshooting matrices, board-level repair guides, detailed electrical schematics, and firmware commissioning manuals are delivered alongside equipment upon formal project procurement, accompanied by dedicated FAE technical support.

Contact Account Manager for Full Manual

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