The 800 gigabit per second (Gb/s) Ethernet (GE) technology is a new protocol that has been standardized by the Ethernet Technology Consortium. Techniques are presented herein that split an 800GE stream into two 400GE frames (e.g., 400GE-A and 400GE-B) without requiring any mapping. Under aspects of the presented techniques the 32 virtual lanes of the 800GE stream may be grouped into two groups of 16 virtual lanes; both the 400GE-A and 400GE-B links are protected by the Forward Error Correction (FEC) of the 800GE stream; alignment markers (AMs) are inserted according to the 800GE standard; the AM field CM2 is replaced every M AMs with two new markers, which may be used to identify the first 16 virtual lanes (0-15) and the second 16 virtual lanes (16-31) in the 800GE stream; and during transmission the new markers are inserted at the same time on all of the virtual lanes. In the event that a digital signal processing (DSP) facility does not support AM transparency, aspects of the presented techniques uniquely transcode AMs into special rate compensation markers that transport the CM2 and unique markers. At a receiving side, the 400GE-A and 400GE-B frames may be received, aligned by checking the CM2 field (with an extended deskew value), and then reassembled to recover the 800GE traffic.
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Loprieno, Gilberto; Giacometti, Emanuele; Chiesa, Luca Della; and Duda, Jim, "TRANSPORT OF 800GE TRAFFIC OVER TWO 400GE FRAMES", Technical Disclosure Commons, (April 20, 2022)