QSFP

QSFP 40 Gb Transceiver

The Quad Small Form-factor Pluggable (QSFP) is a compact, hot-pluggable transceiver used for data communications applications. It interfaces networking hardware to a fiber optic cable or active or passive electrical copper connection. It is an industry format jointly developed and supported by many network component vendors, allowing data rates from 4x10 Gbit/s.[1] The format specification is evolving to enable higher data rates; as of May 2013, highest possible rate is 4x28 Gbit/s (also known as QSFP28).[2]

The QSFP specification accommodates Ethernet, Fibre Channel, InfiniBand and SONET/SDH standards with different data rate options. QSFP+ transceivers are designed to carry Serial Attached SCSI, 40G Ethernet (100G using QSFP28), QDR (40G) and FDR (56G) Infiniband, and other communications standards. QSFP modules increase the port-density by 3x-4x compared to SFP+ modules.

Switch and router manufacturers implementing QSFP ports in their products frequently allow for the use of a single QSFP port as four independent 10 gigabit ethernet connections, greatly increasing port density in a 1U height 24-port switch (24 40Gb ports x 4 = 96 10GbE).[3][4][5]

QSFP has 38 pins with 4 high-speed TX pairs (CML-I) and 4 high-speed RX pairs (CML-O).[6][7]

See also

References

  1. ↑ SFF Committee (May 10, 2013). "SFF Committee Specification SFF-8635 for QSFP+ 10 Gb/s 4X Pluggable Transceiver Solution (QSFP10)" (PDF).
  2. ↑ SFF Committee (May 10, 2013). "SFF Committee Specification SFF-8665 for QSFP+ 28 Gb/s 4X Pluggable Transceiver Solution (QSFP28)" (PDF).
  3. ↑ "Cisco Nexus 5600 specifications".
  4. ↑ "Finisar 4 x 10GbE fanout QSFP".
  5. ↑ "Arista 40Gb port to 4 x 10GbE breakout" (PDF).
  6. ↑ INF-8438i Specification for QSFP (Quad Small Formfactor Pluggable) Transceiver Rev 1.0 November 2006
  7. ↑ SFF-8436 Specification for QSFP+ 10 Gbs 4X PLUGGABLE TRANSCEIVER Rev 4.8 October 31, 2013

External links


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