Broadcom provides the (available to licensees) with:
| Model | Ports | Max Speed | Exclusive Features | |-------|-------|-----------|---------------------| | BCM84885 | 1 | 5GBASE-T | None (generic) | | | 4 | 10GBASE-T | SecureLink+, DeepSnooze, advanced TDR | | BCM84889 | 4 | 10GBASE-T | Adds MACsec on-PHY (announced, sampling) | bcm84886 exclusive
Standard PHYs have predictable latency: roughly 2-4 microseconds. The BCM84888, when used in "exclusive" mode with a Broadcom companion chip, can cut that latency to sub-1 microsecond by bypassing internal buffering. This feature is locked via strapping pins. Commodity implementations cannot unlock this because the necessary MAC-side logic is missing. Broadcom provides the (available to licensees) with: |