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What is the difference between qsfp+ and sfp+ optical modules?

SFP+ is a 10G optical module. The 10G module has undergone development from 300Pin, XENPAK, X2, and XFP, and finally realizes the transmission of a 10G signal in the same size as the SFP. This is SFP+. With its advantages of miniaturization, low cost and other advantages, the SFP meets the high density requirements of optical modules for equipment. It has been implemented since 2002 and has replaced XFP as the mainstream of the 10G market by 2010.

QSFP (Quad Small Form-factor Pluggable): Four-channel SFP interface (QSFP), QSFP was born to meet the market demand for high-density high-speed pluggable solutions. This 4-channel pluggable interface has a transmission rate of 40 Gbps. Many key technologies mature in XFP have been applied to this design. QSFP+: Quad Small Form-factor Pluggable Plus Quad Small Pluggable (QSFP+) solution is designed for high density applications. The system components include electromagnetic interference (EMI) shielding, active optical cable (AOC), passive copper cable assemblies, active copper cable assemblies, optical MTP cable assemblies, optical loopbacks, host connectors, connectors, and cage stacked integration.

The document of the SFF-8436 specifies a radio transceiver mechanical form factor with a locking mechanism, host-board electrical-edge connector and interface. Hot-swappable transceivers integrate 4 transmit and receive channels 4. Molex's QSFP+ transceiver can replace 4 standard SFP+ transceivers. The result is greater port density and overall system cost savings over traditional SFP+ products. QSFP+ cable assemblies are designed to provide a very high density of stacked connector configurations. This system will support 10G Ethernet, Fibre Channel, InfiniBand*, SAS and SONET/SDH standards using different data rate options.

Includes InfiniBand * Separate Data Rate (SDR), Dual Data Rate (DDR) and Quad Data Rate (Report), Ethernet System (10 ~ 40 gbp s), Fibre Channel (8, 10 gbp s), SAS (12 gbp s).

The 40G-LR4 QSFP+ is targeted at data center applications. Compared to the larger optical modules used today, the QSFP+ package has advantages in power and port density. The new product complies with the QSFP+ multisource agreement (MSA) and consumes up to 2.5W, and supports IEEE802.3ba (40Gbase-LR4) and ITU-T G.695 (OTU3) standards. Another 40Gbps module is the first 40-kilometer CFP module for 2-km applications. The new product integrates a laser diode on the optical transmitter and a high-speed PIN photodiode on the optical receiver through Sumitomo Electric's high-speed 40-Gbps electroabsorption modulator. This 40G-FR CFP module can support both IEEE 802.3bg (40GBase-FR) and ITU-T G.693 (OTU3) standards. Its maximum power consumption is consistent with CFP MSA power level two.

At 100Gbps, the QSFP28 is a 100G-LR4 CFP low-power module for single-mode fiber connections up to 10 kilometers away. The new module includes a CMOS-based Gearbox chip that consumes only two-thirds of the current 100G-LR4 CFP (maximum 16W) module. This 100G-LR4 CFP module provides customers with both IEEE802.3ba (100GBASE-LR4) and ITU-T G.959.1 (OTU 4) standards.

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