The Cisco 50GBASE SFP56 modules are a portfolio of small form-factor pluggable transceivers designed to provide high-density, low-power 50G and 25G Gigabit Ethernet connectivity for data center and high-performance computing applications. These modules use the SFP56 form factor and support both 50G PAM4 and 25G NRZ optical interfaces. They comply with IEEE standards including 802.3cc, 802.3cn, 802.3cd, 802.3by, and CPRI V7.0.
Key features and benefits include:
- Interoperability with other IEEE-compliant 50G and 25G interfaces.
- Certified and tested on Cisco SFP56 ports for performance, quality, and reliability.
- Support for various cable types including passive copper cables (DAC) with lengths from 0.5 to 5 meters, featuring LSZH jackets.
- A broad range of modules including short link (SL), short reach (SR), long reach (LR), extended reach (ER), and bidirectional (Bidi) modules for single-mode fiber (SMF) and multimode fiber (MMF).
The SFP56 electrical interface uses single-lane 50G four-level Pulse-Amplitude Modulation (PAM4), which encodes two bits per symbol, effectively doubling the data rate compared to NRZ modulation. This allows transmission of 50 Gb/s over a 25 GHz signal bandwidth.
