QSFP-DD-400G-SR4: Frequently Asked Questions
Q: What is the maximum transmission distance of the QSFP-DD-400G-SR4 transceiver?
A: The QSFP-DD-400G-SR4 optical transceiver supports transmission distances of up to 100 meters over OM4 multimode fiber (MMF), using compatible MTP/MPO-12 APC fiber optic cabling.
Q: What are the similarities and differences between the QSFP-DD-400G-SR4 and QSFP-DD-400G-SR8 transceivers?
A: Both transceivers support 400G short-reach connectivity and use eight 50G PAM4 electrical lanes. However, they differ in their optical interfaces. The 400GBASE-SR4 uses four 100G PAM4 optical lanes and typically employs an MTP/MPO-12 APC multimode fiber connector. It can connect to compatible 400G SR4 modules in QSFP112 or OSFP form factors. In contrast, the 400GBASE-SR8 uses eight 50G PAM4 optical lanes and an MTP/MPO-16 APC multimode fiber connector for connections between compatible SR8 transceivers. Both solutions require matching optical specifications and compatible host interfaces.
Q: What are the main connectivity options for the QSFP-DD-400G-SR4 transceiver?
A: The QSFP-DD-400G-SR4 is designed for short-reach 400G Ethernet connections between compatible switches, network interface cards (NICs), and other networking devices. It can connect to NICs equipped with QSFP112 or OSFP ports when the corresponding SR4 optical interfaces, protocols, and host configurations are supported. Unlike SR8 solutions, which use eight optical lanes, SR4 uses four 100G optical lanes, making it suitable for compatible four-lane 400G interconnect applications.
Q: Can a QSFP-DD-400G-SR4 transceiver be plugged directly into an OSFP port?
A: No. QSFP-DD and OSFP are physically different form factors and are not directly interchangeable. A QSFP-DD-400G-SR4 transceiver must be installed in a compatible QSFP-DD port, while an OSFP port requires a compatible OSFP module. However, a QSFP-DD SR4 transceiver can establish an optical link with a compatible OSFP SR4 transceiver at the opposite end, provided that both modules support matching optical specifications and the host platforms are compatible.
Q: Can the QSFP-DD-400G-SR4 transceiver connect devices from different manufacturers?
A: Yes. The QSFP-DD-400G-SR4 can support interoperability between compatible devices from different manufacturers, provided that both ends meet the required Ethernet standards and optical specifications. SFPPlaza offers transceiver compatibility options for a wide range of mainstream networking platforms. For optimal performance, please provide your switch or NIC model, port type, and required connection configuration so that compatibility can be verified before ordering.
