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“XDR” stands for “eXtended Reach DR”, and “PLR” stands for “Parallel Long Reach”. XDR4 / PLR4 optics have a reach of 2km / 10km using single-mode fiber, and the “4” indicates 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 (4 fibers for Tx and 4 fibers for Rx). Each optical channel operates at 100Gb/s, enabling a total bandwidth of 400G. 400G-XDR4 / PLR4 interfaces use an MPO-12 connector to connect to 4 fiber pairs.
Refers to 2x “400G-XDR4” or 2x “400G-PLR4” interfaces, as described above. 800G-2XDR4 / 2PLR4 modules have 2x MPO-12 connectors, enabling 2 physically distinct 400G-XDR4/PLR4 links from each 800G transceiver without the need for optical breakout cables. The image below illustrates the dual MPO-12 connectors used in an OSFP-800G-XDR4 transceiver.
“FR” / “LR” refers to 2km / 10km reach using SMF, and “4” indicates there are 4 optical channels. All 4 optical channels from a 400G-FR4 / LR4 module are multiplexed onto one fiber in each direction (1 Tx fiber and 1 Rx fiber). Each optical channel operates at 100Gb/s, enabling 400G for each 400G-FR4/LR4 interface over a single fiber pair. 400G-FR4 / LR4 modules use a duplex LC optical connector.
Refers to 2x “400G-FR4” or 2x “400G-LR4” interfaces as described above. 800G-2FR4 / 2LR4 modules have 2 duplex LC connectors, enabling 2 physically distinct 400G- FR4/LR4 links from each 800G transceiver without the need for optical breakout cables. The image below illustrates the dual LC-duplex connector used on the OSFP-800G-2FR4 transceiver.
In some instances - under two conditions.
i) The 800G module must be capable of operation at ½ speed (with each electrical lane running at 50G PAM-4 instead of 100G PAM-4). The 800G-2XDR4 / 2PLR4 optics are not capable of dual-rate operation, so they cannot be used in 400G ports. JTOPTICS’s 800G-2FR4/LR4 transceivers, AOC and DAC cables can operate at ½ speed.
ii) The 400G switch port must be capable of supporting the higher power draw of 800G modules. 800G modules draw more power than 400G modules, so should only be used in 400G platforms capable of powering and cooling the 800G modules. Refer to the transceiver and cable datasheet for transceiver power consumption, and JTOPTICS 400G switch platform datasheets for details on specific systems.
800G platforms allow data centers and high-performance computing environments to address growing needs for higher bandwidth at lower cost and power per gigabit. Key benefits include:
• Increase switching bandwidth by a factor of 2 when compared to 400G/port systems. Migrating from a 32x 400G/port to a 32x 800G/port system doubles the bandwidth density from 12.8T / RU to 25.6T / RU.
• Easy aggregation of 400G links: All 800G/port systems can be configured as 2x 400G, and all JTOPTICS 800G optics allow 2 physically distinct 400GE links without the need for optical breakout cables.
• High density 400G and ultra-high density 100G: A 32 port 1RU 800G system enables 64 ports of 400GE, or 256 ports of 100GE in a single RU. JTOPTICS offers 800G optics that enable 2x 400GE and 8x 100GE connectivity that interoperate with existing 400G and 100G optics.
800G optics and cables use the same form-factors used by 400G optics, the OSFP and the QSFP-DD..
• The OSFP: The OSFP stands for “Octal Small Form-factor Pluggable”. It is described as an “Octal” module because the electrical interface of an OSFP connector consists of 8 electrical lanes. When used for 800G, each electrical lane is modulated at 100Gb/s, for a total of bandwidth of 800Gb/s.
• The QSFP-DD: The QSFP-DD stands for “Quad Small Form-factor Pluggable (QSFP) – Double Density (DD)”. The QSFP-DD form factor is similar to the QSFP form factor, with an additional second row of electrical contacts to increase the number of high-speed electrical lanes from 4 (in a QSFP) to 8 (in a QSFP-DD). When used for 800G, each electrical lane of the QSFP-DD is modulated at 100Gb/s, for a total bandwidth of 800Gb/s.
No. The OSFP and the QSFP-DD are two physically distinct form factors. For OSFP systems, OSFP optics and cables must be used, and for QSFP-DD systems, QSFP-DD optics and cables must be used.
Yes. The OSFP and QSFP-DD describe the physical form factor of the module. If the Ethernet media types are the same, the OSFP and QSFP-DD modules will interop with each other.
All 800G modules and cables utilize 8x electrical lanes in each direction (8 transmit lanes and 8 receive lanes), with each lane running at a data rate of 100G PAM-4, enabling an aggregate bandwidth of 800Gb/s per module. The optical output of all 800G transceivers also consist of 8 optical waves modulated at 100G PAM-4 per lane.
800G
transceivers, Active Optical Cables (AOCs), and Direct Attach Copper (DAC)
cables are cutting-edge components designed to support the next generation of
high-speed networking in data centers, enterprise networks, and
high-performance computing environments. With data rates of up to 800 Gigabits
per second (Gbps), these components address the growing demand for higher
bandwidth and more efficient data transmission.