QSFP

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The Quad (4-channel) Small Form-factor Pluggable (often abbreviated as QSFP or QSFP+) is a compact, hot-pluggable transceiver used for data communications applications. It interfaces a network device motherboard (for a switch, router, media converter or similar device) to a fiber optic cable. It is an industry format jointly developed and supported by many network component vendors, supporting data rates from 4x10 Gbit/s.[1] The format specification is evolving to enable higher data rates; as of May 2013, highest supported rate is 4x28 Gbit/s.[2]

The QSFP specification supports Ethernet, Fibre Channel, InfiniBand and SONET/SDH standards with different data rate options. QSFP+ transceivers are designed to support Serial Attached SCSI, 40G Ethernet, 20G/40G Infiniband, and other communications standards. QSFP modules increase the port-density by 3x-4x compared to SFP+ modules.

QSFP has 38 pins with 4 high-speed TX pairs (CML-I) and 4 high-speed RX pairs (CML-O).[3][4]

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