10Gb/s Ethernet: switching to a Broadcom SFP+ module

Original Article ↗ Hacker News Discussion ↗

10GBASE‑T SFP+ Modules & Heat

  • Many report older 10GBASE‑T SFP+ modules (e.g., early 10GTek) as unusably hot and unstable.
  • Newer Broadcom‑based copper SFP+ modules from various Chinese brands are described as much cooler, cheap (<$30), and reliable, even in hot environments.
  • Advice: if you must use RJ45 SFP+, prefer models supporting 2.5G/5G (802.3bz) as they tend to use newer, cooler silicon.
  • Several commenters still recommend “avoid RJ45 SFP+ if possible,” citing power draw, heat, and quirky compatibility.

Copper vs DAC vs Fiber for 10G+

  • Strong consensus: for short runs (up to ~5–7 m), direct‑attach copper (DAC) is ideal: low heat, low cost, low latency, and simple.
  • For in‑wall or longer links, many argue fiber is now the better default over 10GBASE‑T: cooler PHYs, higher future headroom, and cheaper SFP+ switches than 10GBASE‑T switches.
  • Others counter that existing Cat5e/6 often works fine for 10G at typical home distances and is simpler for non‑experts: just match cable category to speed.

Home Cabling and Future‑Proofing

  • Growing view: new structured cabling should include single‑mode fiber (often OS2), sometimes alongside Cat6A for PoE.
  • Some report full‑house OS2 installs (plus selective Cat6A) as “future‑proof,” with 10/25G today and 40–100G possible later using the same fiber.
  • Debate on multimode vs single‑mode: multiple commenters say falling single‑mode prices and simpler standardization now make it the default; multimode’s advantages are seen as fading.
  • A minority argues that most homes will never need more than 2.5–10G and that complexity of media converters and SFPs isn’t justified.

Realtek 10G & Low‑Cost Switching

  • New Realtek 10G chipsets (RTL8127 family, RTL8261C, etc.) are cited as bringing cheap, low‑power 10G NICs and SFP+ media converters, especially on PCIe x1 and USB‑C.
  • Several inexpensive 4–8‑port 10G (mostly SFP+) switches are mentioned as making small 10G cores feasible at home.

Wi‑Fi vs Ethernet

  • One camp claims Wi‑Fi 7 and high‑throughput WLAN make Ethernet “dead for home use.”
  • Others strongly disagree, emphasizing wired reliability, latency, consistent throughput, and support for PoE‑powered APs, cameras, and other devices.

SFP Reprogramming & GPON/XGS‑PON Sticks

  • Multiple tools (vendor boxes, low‑cost gadgets, SBCs, and scripts) are discussed for reprogramming SFP identifiers to bypass vendor locks or “lie” about optics.
  • GPON/XGS‑PON “ONT‑on‑a‑stick” SFPs are widely reported as running very hot; low‑wattage models from some vendors are suggested as a partial mitigation.