Hotwire Communications has successfully tested 800 Gigabit Ethernet over existing production fiber in South Florida, using a Cisco 8223 router and 800G ZR+ coherent optical modules. The company announced the results on October 19, 2026, after connecting equipment between two operating network sites rather than conducting the trial only in a laboratory.

The demonstration matters because network operators want to increase transmission capacity without replacing every underground fiber route. Hotwire says the optical test shows that at least part of its installed infrastructure can support much faster connections using newer electronics and transceivers.

An 800G fiber link, not 51.2 Tbps per strand

The Cisco 8223 is powered by the Silicon One P200 networking chip and offers 51.2 terabits per second of aggregate system capacity. That figure describes the router, not a single optical link or the speed measured across Hotwire’s fiber. The field test validated an 800GE connection between sites.

Cisco’s 800G ZR+ coherent optics use digital signal processing and optical modulation to carry high-speed traffic over wavelength-division multiplexed fiber networks. The module family’s published specifications describe amplified reach exceeding 1,000 kilometers under suitable conditions, but Hotwire did not report that distance for its own test.

The distinction between a device specification and a field result is important. A router may offer dozens of high-capacity ports, yet each link still depends on fiber loss, optical amplification, available spectrum and error-correction performance. Real-world tests help operators understand whether existing routes meet those conditions.

What remains unproven

Hotwire said the trial demonstrated an upgrade path for its network, but did not disclose the route length, detailed error-rate measurements, installation costs or the timing of an 800G commercial service. The company also made no independently audited claim of network-wide electricity savings.

The result follows other 800G networking developments, including KT’s 800Gbps data-center links and research into coherent pluggable optics for subsea networks. Cisco is separately developing denser optical modules with NVIDIA, but that proposal should not be confused with Hotwire’s completed 800G test.

For network engineers, the next evidence to watch is a customer deployment with published optical margins, reliability and power measurements. Hotwire’s achievement is a real production-fiber validation—not yet a commercial rollout.

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