SFP+

SFP+ is the 10 Gb/s evolution of SFP in the same footprint. It won the 10G market against the larger XFP by moving the clock-and-data recovery and signal conditioning onto the host board, keeping the module small, cool and cheap.

Key facts


Lanes × rate	1 × 10.3125 Gb/s
Total	10G
Connector	LC duplex; also DAC (SFP+ direct-attach copper) and 10GBASE-T RJ45
Supply	3.3 V, typically ≤ 1.5 W
Applications	10GBASE-SR/LR/ER/ZR, 8GFC/16GFC, OC-192, tunable DWDM SFP+

Specifications

SFF-8431 — SFP+ 10 Gb/s and Low Speed Electrical Interface (SFI).
SFF-8418 — SFP+ 10 Gb/s Electrical Interface; SFF-8419 — *Power and Low

Speed Interface*.

SFF-8432 — Module and Cage; SFF-8071 — 0.8 mm Card Edge Connector;

SFF-8433 — Ganged Cage Footprints and Bezel Openings.

SFF-8083 (SFP10), SFF-8081 (SFP16), SFF-8084 (4 Gb/s) — transceiver

solution documents for specific rates.

SFF-8461 — Active Cable Specifications.
SFF-8690 — Tunable SFP+ Memory Map for ITU Frequencies (DWDM tuning).
SFF-8472 — Management Interface.

Management interface

Same two-address SFF-8472 model as SFP (A0h identity, A2h diagnostics), with 10G-specific codes. Tunable DWDM SFP+ modules add the SFF-8690 page for channel/wavelength selection — the mechanism CodingBox uses to set the channel on tunable modules (see DWDM).

Linear vs limiting

SFP+ modules come in limiting (most) and linear (e.g. 10GBASE-LRM) receiver types; the host must support the type. The module advertises this in memory.

In CodingBox

Fully supported per SFF-8472, including tunable-DWDM channel setting via SFF-8690 and DDM with per-module thresholds on the DDM screen. SFP+ is the most frequently recoded form factor — see Vendor lock.