Three scale-up MSAs launched at OFC 2026, and the loudest, XPO, was championed by Arista co-founder Andy Bechtolsheim. But Meta's 90 million hours of data took apart its core selling point. Is XPO a bet on extending pluggables' life, or the real answer?

Arista delivered its strongest cash flow ever, yet management said plainly that "demand is the best, supply is the opposite tale." The AI target was raised to $3.5B, Scale-Across data center interconnect was the biggest surprise, and XPO opens the next decade-long optics race.

After 1.6T there is no single winner: every reach has its own lowest-power answer. Two companies on this panel gave the same number — the reverse gearbox feeding slow-and-wide optics costs 4 pJ/bit, more than the optics themselves. And Oracle's field data pulled the spotlight back to the 4,096 fiber contacts on a front panel.

At 1.6T, choosing IMDD no longer buys you lower power — only shorter reach. With a reach-collapse chart and a standards matrix full of "Undefined," Nokia argues the real 1600G+ problem isn't physics but too many options and an industry slow to converge.

Scale-across planning has shifted from "how many wavelengths do I need" to "how many fibers do I need", because regenerator sites can no longer supply the power to light that many fibers. Acacia mapped the whole optics landscape onto four scales in a seven-step chart, and the 400G/lane physics line is now setting the handover timeline for campus DCI.

Edgecore admitted 1.6T LPO is "not yet successful," so the stopgap is gone and CPO can no longer wait a generation. Three MSAs at OFC 2026 push CPO toward swappable engines, while SONiC only now has the models it needs. Hardware decides who ships; software decides who deploys at scale.

Pluggable optics are hitting the front-panel limit, not a speed limit. Andy Bechtolsheim sandwiches a cold plate between two paddle cards to shrink 102.4T from 4U to 1U. His only doubt about CPO is attach yield, not the physics, and a Foxconn connector now sampling decides whether XPO works at 400G/lane.

At ECOC 2026, 12 speakers weren't really arguing CPO vs pluggables — they were arguing about the SerDes at the XPU edge. Arista's XPO and Broadcom/NVIDIA CPO bet on 200G→400G PAM4; OCI and DWDM bet on slow-and-wide NRZ. 2027–2028 belongs to fast-and-narrow; slow-and-wide must wait for the gearbox tax to hit zero.

The CPO vs. NPO vs. XPO debate was never about technology; it is about paying down supply-chain risk in installments. This six-way OCP 2026 APAC panel produced one hard deadline: 409.6T switches will push pluggables to the limit in about 18 months, and all four inflection points land on Taiwan's packaging and connector supply chain.

At OFC 2026, Amphenol showed its vision for AI data center interconnect: the XPO module packs 8x the density of OSFP with built-in liquid cooling, challenging CPO's lead as the industry moves from 224G to 448G.

As NVIDIA GPU rack power soars from 120 kW to 600 kW, interconnect technology faces a sweeping overhaul. From Andy Bechtolsheim's XPO vision to Dave Welch's THz dielectric waveguides, who will survive the 1.6T/3.2T race?