lee@ricewind.comTel+86 17621197907Serving 50+ countries
RICEWIND

Huawei / SFP optical transceivers

Huawei 40G QSFP+ 150m SR4 Equipment information & support

The Huawei 40G QSFP+ 850nm 150m (40GBASE-SR4) is a high-density short-reach optical transceiver engineered for datacenter spine-leaf fabrics, delivering 40Gbps throughput up to 150m over OM4 multi-mode fiber with MPO/MTP-12 connector.

Equipment information

Brand
Huawei
Equipment model
Huawei 40G QSFP+ 150m SR4
Equipment type
SFP optical transceivers
Controller / software version
Confirm against the installed equipment
View full product specifications
Huawei 40G QSFP+ 150m SR4 Official Product View 4

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

Physical Form Factor
QSFP+ (40GBASE-SR4)
Data Rate
40.0 (4x10G VCSEL parallel) Gbps
Central Wavelength
850 nm
Maximum Distance
0.15 (OM4 fiber 150m / OM3 100m) km
Fiber Type
Multi-Mode Fiber (MMF) (MMF)
Optical Connector
MPO/MTP-12

Alarms & troubleshooting

RX_LOS (Optical RX Power Loss)
Port Link/ACT LED Off, System ALM LED solid amber
Remote laser disabled, broken MPO-12 multimode fiber, contaminated MPO ferrule, or optical path attenuation exceeding receiver sensitivity (<-10.5 dBm).
1. Run 'display transceiver diagnosis interface' to inspect per-lane RX optical power. 2. Clean the MPO-12 connector and QSFP+ optical interface using an MPO one-click cleaner. 3. Verify remote Tx power with an optical power meter; replace OM3/OM4 patch cord if optical continuity is broken.
MODULE_TEMP_HIGH (Transceiver DDM Over-Temperature)
Port Link LED solid green, System ALM LED blinking amber
Switch air filter clogged, ambient data center temperature exceeding standard (>40°C), fan tray failure, or thermal entrapment in high-density QSFP+ cage layout.
1. Run 'display transceiver diagnosis interface' to check internal DDM temperature (Threshold: Warning >70°C, Alarm >75°C). 2. Inspect switch chassis fan status and airflow; clean blocked air filters. 3. If ambient cooling is normal and adjacent modules are stable, relocate or replace the overheating module.
BIAS_HIGH_ALM (Laser Bias Current High Alarm)
Port Link LED solid green, System ALM LED blinking amber
Aging of internal 4-channel 850nm VCSEL laser array; driver circuit excessively increases bias current to maintain optical output power, exceeding alarm threshold.
1. Execute 'display transceiver verbose' to compare Tx Bias current against high thresholds across Lanes 0-3. 2. Verify if Tx output power has degraded near the minimum threshold (-7.6 dBm). 3. Proactively replace the QSFP-40G-SR4 module during an off-peak maintenance window before total laser failure.
LINK_FLAPPING_CRC (Port Link Flapping & High CRC Error Rate)
Port Link/ACT LED rapidly alternating green and amber
Incorrect MPO fiber polarity (Type-A vs Type-B mismatch), damaged or scratched optical pin facets causing high return loss, or Clock and Data Recovery (CDR) lock failure.
1. Run 'display interface' to monitor the increment rate of input and CRC errors. 2. Confirm that the cabling adheres to the 40G Type-B (Key-Up to Key-Up) polarity standard. 3. Inspect MPO ferrule end-face using a fiber microscope, clean thoroughly, and replace patch cord with low-loss OM4 fiber if CRC errors persist.
TRANSCEIVER_FAULT (I2C Bus Read Failure / Hardware Defect)
Port LED off or solid amber, System ALM LED solid red
Oxidation/misalignment of QSFP+ golden finger contacts, corrupted EEPROM DOM firmware, I2C bus lockup, or internal MCU power regulation failure.
1. Unlatch and pull out the QSFP+ module, clean golden finger pins with isopropyl alcohol, and inspect for physical bent pins. 2. Re-insert firmly until locked into place; execute 'display transceiver' to verify if vendor information and serial number are recognized. 3. Cross-test in an adjacent slot; if the module remains unresponsive to I2C reads, replace the 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

Share on-site information

  1. 01

    Identify the exact model

    Record the nameplate, system model and controller or module model.

  2. 02

    Keep the alarm details

    Record the full alarm text, indicator colour, timing and whether it persists.

  3. 03

    Describe recent changes

    Note recent replacements, software updates or configuration changes.

Record information visible in the existing interface. Electrical measurements, disassembly and replacement should follow the applicable manufacturer's manual and be performed by qualified personnel.

Your model and these details will be added to the enquiry form for you to review before sending.

Related technical articles

Browse the technical guides or send a question about this model.

View all articles

Need a replacement module or supporting equipment?

Confirm the full model, system configuration and compatibility requirements before enquiring about suitable products.

Ask about suitable products

Have a model and an on-site issue?

Share the exact model, alarm text and observed symptoms to help identify relevant information and compatibility requirements.

Request technical support