Arista Q112-400G-SR4 Compatible 400G QSFP112 SR4 PAM4 Optical Transceiver Module (850nm MTP/MPO12 OM3/OM4 100m with FEC DDM)
The QSFP112 400GBASE SR4 transceiver module is designed for 400G Ethernet links over 100m of Multi-mode fiber. The module contains 4 parallel channels at a center wavelength of 850nm, each operating at 106.25G. On the receiver path, 4 photodiodes and a 4-channel TIA array are used, along with PAM4 re-timers.
Product Details
| Arista Compatible | Q112-400G-SR4 | Vendor Name | Walsun |
| Form Factor | QSFP112 | Max Data Rate | 425Gbps |
| Wavelength | 850nm | Max Distance | 60m on OM3/100m on OM4 |
| Modulation Format | PAM4 | Host Required | FEC |
| Connector | MPO-12 (APC) | Voltage Supply | 3.3V |
| Cable Type | MMF | DDM Support | Yes |
| Transmitter Type | 850nm VCSEL | Receiver Type | PIN |
| TX Power | -4.6~+4.0dBm | Receiver Sensitivity | < -4.6dBm |
| Operation Temperature | 0 to 70°C (32 to 158°F) | Maximum Power | < 8W |
| Protocols | QSFP112 MSA, IEEE 802.3bs | Application | 400G Ethernet, Data Center Interconnect, Infiniband Interconnects |
400G QSFP-DD vs 400G OSFP/CFP8: What are the differences?
A: The table below includes detailed comparisons for the three main form factors of 400G transceivers.
| 400G Transceiver | 400G QSFP-DD | 400G OSFP | CFP8 |
|---|---|---|---|
| Application Scenario | Data center | Data center & telecom | Telecom |
| Size | 18.35mm× 89.4mm× 8.5mm | 22.58mm× 107.8mm× 13mm | 40mm× 102mm× 9.5mm |
| Max Power Consumption | 12W | 15W | 24W |
| Backward Compatibility with QSFP28 | Yes | Through adapter | No |
| Electrical signaling (Gbps) | 8× 50G | ||
| Switch Port Density (1RU) | 36 | 36 | 16 |
| Media Type | MMF & SMF | ||
| Hot Pluggable | Yes | ||
| Thermal Management | Indirect | Direct | Indirect |
| Support 800G | No | Yes | No |
FAQ about 400G OSFP Transceiver
Q: How does the OSFP address the thermal need?
A: The OSFP includes an integrated heatsink, which increases thermal efficiency and allows modules with up to 15W of power to be installed in a switch chassis with conventional airflow.
Q: What about QSFP backward compatibility?
A: Because the OSFP is somewhat broader and deeper than the QSFP, an adapter that supports current 100G QSFP optical modules in an OSFP cage may be built. Backward compatibility is provided via an OSFP to QSFP adaptor.
Q: What does “SR8”, “DR4”, “XDR4”, “FR4”, and “LR4” mean?
A: “SR” refers to short range, and “8” implies there are 8 optical channels. “DR” refers to 500m reach using single-mode fiber, and “4” implies there are 4 optical channels. “XDR4” is short for “eXtended reach DR4”. And “LR” refers to 10km reach using single-mode fiber.
Q: Can I plug an OSFP transceiver module into a QSFP-DD port?
A: No. QSFP-DD and OSFP are totally different form factors. For more information about QSFP-DD transceivers, you can refer to 400G QSFP-DD Transceiver Types Overview. You can use only one kind of form factor in the corresponding system. E.g., if you have an OSFP system, OSFP transceivers and cables must be used.
Q: Can I plug a 100G QSFP28 module into an OSFP port?
A: Yes. A QSFP28 module can be inserted into an OSFP port but with an adapter. When using a QSFP28 module in an OSFP port, the OSFP port must be configured for a data rate of 100G instead of 400G.
Q: What quality certifications do you have for your 400G transceivers?
A: Walsun 400G transceivers accord with a range of certifications for optical transceivers including ISO 9001:2015, RoHS, REACH, CB, RCM, FCC certificate (EAC Certificate). Rest assured that our products will meet essential quality and safety requirements.
Q:Can the 400G-DR4, 400G-XDR4 and 400G-PLR4 transceivers interoperate with each other?
A:Yes, the 400G-DR4 / XDR4 / PLR4 transceivers can interoperate with each other, with the max distance limited by the shortest reach transceiver.
Q:Can the 400G-FR4 and 400G-LR4 transceivers interoperate with each other?
A:Yes, the 400G-FR4 and 400G-LR4 transceivers can interoperate up to a reach of 2km (limited by the FR4). Note that max allowed Receiver power for the 400G-FR4 (max Rx power of 3.5dBm) may require a minimum level of attenuation to be present if connected to a 400G-LR4 transmitter (Max Tx power of 5.1dBm).
Q:What are the 100G-DR, 100G-FR and 100G-LR QSFP transceivers?
A:The 100G-DR / FR / LR transceivers are 100G QSFP modules that can be plugged into any Arista 100G QSFP port. The part numbers for these parts are QSFP-100G-DR, QSFP-100G-FR and QSFP-100G-LR.
Q:What are QSFP-DD cables?
A:QSFP-DD cables are assemblies including a cable with permanently attached QSFP-DD modules at each end. These cables may be twinax ‘copper’ cables or may be fiber optic. Cables are available in a variety of lengths. The copper versions typically support up to 3 meter lengths while optical versions support links up to 30 meters.
Q:What is the difference between a 400G and 100G optical module?
A:Although 100G optical modules have entered the market, 400G optical modules will push the technology to a greater degree of development as bandwidth, port density, and system energy consumption continues to rise.
Compared to 100G optical modules, the debut of 400G optical modules will usher in a new age of optical communication. Optical communication is evolving from single-carrier modulated coherent detection in low-cost optical modules to multi-carrier polarization multiplexing applications.
Photonic and electrical integration and ADC/DSP technologies will be critical to commercializing 400G optical communication modules and systems. With the urgent requirement for Ethernet standards, the demand for optical parallelization will significantly aid the development of photonic integration technologies.
Q: Can I plug an OSFP module into a 400G QSFP-DD port, or a QSFP-DD module into an OSFP port?
A: No. OSFP and QSFP-DD are two physically distinct form factors. If you have an OSFP system, then 400G OSFP optics must be used. If you have a QSFP-DD system, then 400G QSFP-DD optics must be used.
Q: Is it possible with a 400G OSFP on one end of a 400G link, and a 400G QSFP-DD on the other end?
A: Yes. OSFP and QSFP-DD describe the physical form factors of the modules. As long as the Ethernet media types are the same (i.e. both ends of the link are 400G-DR4, or 400G-FR4 etc.), 400G OSFP and 400G QSFP-DD modules will interoperate with each other.
Q: Can I plug Walsun OSFP module into a 400G QSFP-DD port, or Walsun QSFP-DD module into an OSFP port?
A: No. OSFP and QSFP-DD are two physically distinct form factors. If you have an OSFP system, then Walsun 400G OSFP modules must be used. If you have a QSFP-DD system, then Walsun 400G QSFP-DD modules must be used.
