100G QSFP28 Transceiver
100GBASE-ER4 QSFP28 40km Optical Transceiver
A QSFP28 ER4 optical transceiver designed for 100G Ethernet over single-mode fiber up to 40 km, ideal for ISP backhaul, metro aggregation and long-distance enterprise connectivity.
Specifications
- Warranty
- 5-Years
- Customization
- Free OEM labeling
- Delivery Time
- 48 hours dispatch
- Confirm the basic link conditions first.
Suitable for metro aggregation and long campus links.

100G QSFP28 port
Duplex LC single-mode fiber
Reach up to 40km
Confirm the host has a 100GbE QSFP28 interface before selecting ER4.
ER4 is intended for OS2 single-mode fiber with an LC duplex connection.
Check actual fiber route, patching, and optical loss against the project path.

- Know the module. Then check the project.
The specification is the starting point. The review inputs help confirm the right option before ordering.
Ethernet standard | IEEE 802.3ba 100GBASE-LR4 |
|---|---|
Data rate | 100GbE |
Form factor | QSFP28 |
Maximum reach | Up to 40 km |
Fiber type | OS2 single-mode fiber |
Connector | Duplex LC/UPC |
Wavelength / optical design | LAN-WDM 1295-1310nm |
DDM / DOM | Supported |
Operating temperature | Commercial; industrial option by review |
Power consumption | Typical low-power QSFP28 ER4 option; final value depends on selected module |

- Typical 100G ER4 deployment scenarios
Use these as starting points, then send your actual equipment model or BOM for review.

- 100G switch to 100G switch
Simple duplex OS2 fiber link between two 100G QSFP28 ports.
Check before order: host model, OEM coding, port configuration, and actual fiber path.
- 100G Switch to High-Speed Server NIC
100G ER4 link from an aggregation switch to a router, NIC, server uplink, or transport-facing interface.


- Quality & Certifications
Every module undergoes rigorous testing in our ISO-certified facility. We validate electrical performance, optical power, temperature cycling, and compatibility across multiple switch platforms before shipment.

- Comprehensive Testing
Every module is qualified on advanced test benches to verify optical power, eye diagram, BER and long‑term reliability before shipment.

Typical validation equipment used before shipment.
Nearby 100G options to compare before ordering
The speed may be the same, but the fiber design, reach, and deployment trade-offs are not.
100G option | Typical Reach | Fiber/connector | Best Fit | Checking before ordering |
|---|---|---|---|---|
100GBASE-SR4 | 100 m | OM4 MMF/MPO-12(OM3 70M) | Short-reach data center links | Fiber type, MPO polarity and switch compatibility |
100GBASE-LR4 | 10 km | OS2 SMF / duplex LC | Standard 10 km duplex single-mode links | Host coding, link budget, and fiber route |
100G CWDM4 | 2 km | SMF / duplex LC | Shorter-reach data center or campus links | Reach limit and interoperability expectation |
100G PSM4 | 500 m | Parallel SMF / MPO | Parallel-fiber links with existing MPO plant | Fiber plant and connector availability |
100G ER4 | 40 km | OS2 SMF / duplex LC | Longer metro or remote links | Optical budget, dispersion, and cost |
100G ZR4 | 80 km | OS2 SMF/duplex LC | Long-distance transport networks | Optical budget, dispersion and amplification requirements |
Frequently Asked Questions
i. What fiber is required for 100G ER4?
OS2 Single-mode Fiber.
ii. Can 100G ER4 work with Cisco?
YES.
Compatible coding available
iii. Can 100G LR4 work with Cisco switches?
Yes. Compatibility depends on the platform, software version, and coding requirements.
iv. What is the difference between LR4 and ER4?
The main difference is transmission distance.
100G LR4 supports links up to 10 km over duplex single-mode fiber, making it suitable for enterprise and campus networks.
100G ER4 extends the reach to 40 km, making it a better choice for metro networks, ISP backhaul and long-distance interconnections.
v. Does 100G ER4 require optical amplification?
No. Under normal deployment conditions, 100G ER4 is designed to operate over up to 40 km of duplex single-mode fiber without optical amplification. For longer distances, solutions such as 100G ZR or additional optical equipment may be required.

