C Form-factor Pluggable

The C form-factor pluggable (CFP) is a multi-source agreement to produce a common form-factor for the transmission of high-speed digital signals. The c stands for the Latin letter C used to express the number 100 (centum), since the standard was primarily developed for 100 Gigabit Ethernet systems.

CFP standardization

The CFP transceiver is specified by a multi-source agreement (MSA) among competing manufacturers. The CFP was designed after the small form-factor pluggable transceiver (SFP) interface, but is significantly larger to support 100 Gbit/s. While the electrical connection of a CFP uses 10 × 10 Gbit/s lanes in each direction (RX, TX),^[1] the optical connection can support both 10 × 10 Gbit/s and 4 × 25 Gbit/s variants of 100 Gbit/s interconnects (typically referred to as 100GBASE-SR10 in 100 meter MMF, 100GBASE-LR10 and 100GBASE-LR4 in 10 km SMF reach, and 100GBASE-ER10 and 100GBASE-ER4 in 40 km SMF reach respectively.)^[2]

In March 2009, Santur Corporation demonstrated a 100 Gigabit pluggable CFP transceiver prototype.^[3]

Supported signals

CFP transceivers can support a single 100 Gbit/s signal like 100GbE or OTU4 or one or more 40 Gbit/s signals like 40GbE, OTU3, or STM-256/OC-768.

Variants

The original CFP specification was proposed at a time when 10 Gbit/s signals were far more achievable than 25 Gbit/s signals. As such to achieve 100 Gbit/s line rate, the most affordable solution was based on 10 lanes of 10 Gbit/s. However, as expected, improvements in technology have allowed higher performance and higher density. Hence the development of the CFP2 and CFP4 specifications. While electrically similar, they specify a form-factor of 1/2 and 1/4 respectively in size of the original specification. Note that CFP, CFP2 and CFP4 modules are not interchangeable (but are inter-operable at the optical interface with appropriate connectors).

CFP

• 82 mm nominal width
• 148 pin electrical connection
• integrated digital signal processor within package
• less than 24 W power usage
• 10×10G or 4×25G lanes

^[1]

CFP2

• 41.5 mm nominal width
• 104 pin electrical connection
• no digital signal processor in package, relies on host card
• less than 12 W power usage
• 10×10G, 4×25G, 8×25G, or 8×50G lanes

^[4]

CFP4

• 21.5 mm nominal width
• 56 pin electrical connection
• no digital signal processor in package, relies on host card
• less than 6 W power usage
• 10×10G or 4×25G lanes

^[5]

MSA 5″×7″ (Gen 1)

• 168 pin electrical connection (designed to be built into a line card)
• digital signal processor within package
• less than 80 W power usage

^[6][7]

MSA 4″×5″ (Gen 2)

• 168 pin electrical connection (designed to be built into a line card)
• digital signal processor within package
• less than 40 W power usage

See also

• Small form-factor pluggable transceiver (SFP)
• QSFP
• CXP (connector)

References

1. "CFP MSA Hardware Specification, Rev. 1.4" (PDF). Retrieved 2010-07-02.
2. "Operational Considerations for Deploying 100 Gigabit Ethernet" (PDF). Retrieved 2012-01-12.
3. "Santur Delivers the World's First 100Gb/s Transceiver Platform for Client Connectivity Based on Photonic Intelligent Integration". news release. March 23, 2009. Archived from the original on July 20, 2009. Retrieved May 27, 2013.
4. "CFP2 MSA Hardware Specification, Rev. 1.0" (PDF). Retrieved 2015-04-17.
5. "CFP4 MSA Hardware Specification, Rev. 1.0" (PDF). Retrieved 2015-05-06.
6. "Optical Integration and the Role of DSP in Coherent Optics Modules" (PDF). Retrieved 2015-04-17.
7. "Multisource Agreement for Generation 2.0 100G Long-Haul DWDM Transmission Module – Electromechanical" (PDF). Retrieved 2015-04-17.

External links

• CFP Committee website