I2C Standard for QSFP Optical Modules
SFF-8636 is a widely adopted specification that defines: Management Interface: A two-wire serial communication protocol (similar to I²C), allowing hosts to monitor module parameters and issue control commands. SFF-8635 QSFP+ 4X 10 Gb/s Pluggable Transceiver Solution (QSFP10) SFF-8685 QSFP+ 4X 14 Gb/s Pluggable Transceiver Solution (QSFP14). SFF-8024 SFF Module Management Reference Code Tables : This specification provides codes for module identifiers, encoding values, connector types, extended compliance codes, host electrical interfaces and module media interfaces. Additional Documentation The following links provide additional documentation, including simulation and HW Manager support. As shown in the following figure, the card uses a combination of I2C multiplexers (PCA9545A) and I/O expanders (TCA6408A) to access and control power and sideband signals for all four QSFP56 modules. The sideband signals include: The power signals include: The other QSFP56 I/O expanders have. The FS® 50GBASE Quad Small Form-Factor Pluggable (QSFP28/SFP56) portfolio offers customers a wide variety of high-density and low-power 50 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and service provider.
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