400G Transceivers Guide
400G
transceivers, Active Optical Cables (AOCs), and Direct Attach Copper (DAC)
cables are critical components for high-speed networking in modern data
centers, enterprise networks, and high-performance computing environments.
These components support data rates of up to 400 Gigabits per second (Gbps),
providing the bandwidth necessary to handle today's data-intensive
applications.
Unleashing Ultra-High-Speed Connectivity with 400G Transceivers
JTOPTICS® 400G transceivers are engineered for next-generation data center environments requiring massive bandwidth and ultra-low latency. Ideal for hyperscale, cloud, and AI-driven infrastructures, they support high-density switch interconnects and accelerate data flow across core and spine-leaf networks. With optimized power efficiency and advanced modulation, 400G modules future-proof your network for data-intensive workloads and rapid scalability.
Frequently Asked Questions
400G QSFP-DD SR8 Transceivers
“SR” refers to 100m reach using multi-mode fiber, and “8” implies there are 8 optical channels. Each of the 8 optical channels from an SR8 module are carried on separate fibers, resulting in a total of 16 fibers (8 Tx and 8 Rx). Each optical channel operates at 50Gb/s. The SR8 module uses an MPO-16 APC connector to connect to 8 fiber pairs. The SR8 module can be configured for 400G- SR8, 2x 200G-SR4 and (operating at ½ rate) 2x 100G-SR4.
400G QSFP-DD SR4 Transceivers
“SR” refers to 50m reach using multimode fiber, and the “4” implies there are 4 optical channels. Each of the 4 optical channels are carried on separate fibers, resulting in a total of 4 pairs of fibers. Each optical channel operates at 100Gb/s. There are two IEEE defined standards for 100G/wave MMF optics: 400GBASE-SR4 (for 100m reach over parallel OM4 MMF), and 400GBASE-VR4 (for 50m reach over parallel OM4 MMF).
400G QSFP-DD DR4, XDR4 and PLR4 Transceivers
“DR” / “XDR” / “LR” refer to 500m / 2km / 10km reach using single-mode fiber, and “4” implies there are 4 optical channels. Each of the 4 optical channels are carried on separate fibers, resulting in a total of 4 pairs of fibers. Each optical channel operates at 100Gb/s. The DR4 / XDR4 / PLR4 modules use the widely deployed MPO-12 APC SMF connector to connect to 4 fiber pairs.
400G QSFP-DD FR4 / LR4 Transceivers
“FR” / “LR” refers to 2km / 10km reach using single-mode fiber, and “4” implies there are 4 optical channels. Unlike the DR4 and SR8, all 4 optical channels from an FR4 / LR4 are multiplexed onto one fiber, resulting in a total of 2 fibers from the module (1 Tx and 1 Rx). Each optical channel operates at 100Gb/s. The modules use a duplex LC optical connector.
The Arista QDD-400G-DR4-AN is a high-performance 400GBASE-DR4 QSFPDD optical transceiver designed for efficient data transmission over single-mode fiber (SMF). Operating at a 1310nm wavelength with PAM4 modulation, it offers a reach of up to 500 meters. This versatile transceiver supports 4x 100G-DR..
The Arista QDD-400G-FR4-AN is a high-performance 400GBASE-FR4 QSFPDD optical transceiver designed for efficient data transmission over single-mode fiber (SMF). Operating at a 1310nm wavelength and utilizing PAM4 modulation, it achieves an impressive reach of up to 2 kilometers, making it ideal for l..
The Arista QDD-400G-LR4 is a high-performance optical transceiver designed for efficient data transmission in 4 x 100GBASE-LR configurations. Operating at a wavelength of 1310nm, this QSFPDD module provides an impressive reach of up to 10 kilometers over single-mode fiber (SMF), making it ideal for ..
The Arista QDD-400G-SR8 is a high-performance 400GBASE-SR8 QSFPDD optical transceiver engineered for rapid data transmission over multimode fiber (MMF). Operating at an 850nm wavelength and utilizing PAM4 modulation, it supports a transmission distance of up to 100 meters. This versatile module acco..
The Cisco QDD-400-CU is a 400G DAC (Direct Attach Cable) designed for high-speed connectivity in modern data centers. It features QSFP-DD (Quad Small Form-factor Pluggable Double Density) connectors on both ends, utilizing passive Twinax copper for direct, low-latency data transmission. Supporting u..
The Cisco QDD-400G-DR4-S is a state-of-the-art 400GBASE-DR4 QSFPDD optical transceiver designed for high-speed data transmission over single-mode fiber (SMF). Operating at a wavelength of 1310nm and utilizing PAM4 modulation, it delivers a transmission reach of up to 500 meters. This versatile trans..
The Cisco QDD-400G-FR4-S is a high-performance 400GBASE-FR4 QSFPDD optical transceiver designed for reliable data transmission over single-mode fiber (SMF). Operating at a wavelength of 1310nm and utilizing PAM4 modulation, it supports a transmission distance of up to 2 kilometers, making it ideal f..
The Cisco QDD-400G-SR8-S is a cutting-edge 400GBASE-SR8 QSFPDD optical transceiver designed for high-speed data transmission over multimode fiber (MMF). Operating at an 850nm wavelength with PAM4 modulation, it delivers a transmission distance of up to 100 meters. This versatile transceiver supports..
The Cisco QDD-4X100G-LR-S is a high-performance optical transceiver designed to support 4 x 100GBASE-LR configurations, making it ideal for long-distance data transmission. Operating at a wavelength of 1310nm, this QSFPDD module achieves a transmission reach of up to 10 kilometers over single-mode f..
The Dell 470-BBGD 400G QSFP56 Active Optical Cable (AOC) is a high-performance, multimode OM3 fiber solution designed for high-speed data transmission over short distances. It connects two QSFP56-DD (Quad Small Form-Factor Pluggable Double Density) ports, supporting 400Gbps Ethernet and optimized fo..
The Dell DAC-Q56DD-400G is a 400G DAC (Direct Attach Cable) designed for short-range, high-speed data transfer in data centers and enterprise networks. This passive Twinax copper cable connects devices with QSFP-DD (Quad Small Form-factor Pluggable Double Density) ports, supporting data rates up to ..
The H3C QSFPDD-400G-FR4-WDM1300 is a high-performance 400GBASE-FR4 QSFPDD optical transceiver engineered for efficient data transmission over single-mode fiber (SMF). Operating at a 1310nm wavelength and utilizing PAM4 modulation, it supports a transmission distance of up to 2 kilometers, making it ..