Introduction to 40GBASE-SR4 and its Application

What is 40GBASE-SR4

40GBASE-SR4 is a type of ethernet that has a data rate of 40 gigabits per second. It is an Ethernet standard that typically uses shielded twisted pair cables. The 40GBASE-SR4 standard was ratified by the IEEE on November 16, 2017, and it defines the physical layer specifications for 40 Gigabit Ethernet over shielded twisted-pair cabling.

40GBASE-SR4 is the newest standard of Ethernet. It is the fastest and most advanced Ethernet standard, with a data rate of 40 gigabits per second. This new standard aims to provide high-speed data transmission for data center networks and other applications that require large bandwidth. The 40GBASE-SR4 standard specifies 40 gigabits per second (Gbps) over four lanes, or two 20 Gbps lanes in each direction. The increase in throughput from 10 Gbps to 20 Gbps doubles the capacity for the same amount of power and cabling.

What are the Features of 40G BASE-SR4?

40GBASE-SR4 is a standard for transmitting data on optical fiber. It provides a transmission rate of 40 Gbit/s over a distance of 150 m and uses the SC connector.

40GBASE-SR4 is the newest standard for transmitting data over short distances, but it does have some disadvantages. For example, it requires an expensive and bulky transceiver at both ends of the cable, which makes it challenging to scale to longer distances.

40G BASE-SR4 is a standard for optical modules that are used in the Passive Optical Network (PON). It is one of the standards that are being developed by the IEEE. PONs are networks that use fiber optic cables to transmit data. This standard was created to provide a way for more data to be transmitted over existing networks with minimal changes.

The 40GBASE-SR4 standard allows for 40 Gbps transmission rates, which is four times faster than the 10GBASE-SR standard. This means that it can transmit 4x as much information as 10GBASE-SR and will be able to handle traffic coming from more devices.

How Does 40GBASE SR4 Work?

The 40GBASE SR4 protocol stack is a serial interface standard that is used to connect 10GBASE-SR optical transceivers to the PHY layer. The 40GBASE SR4 protocol stack is based on the IEEE 802.3ae-2002 specification for 10 Gigabit Ethernet and offers a data rate of up to 400 Gbps.

It was developed in order to provide high-speed data transfer rates of 40 Gb/s. The standard was developed by the IEEE 802.3 working group and published in 2011.

The 40GBASE SR4 protocol stack consists of four layers: Physical layer, Media Access Control (MAC) layer, Link Layer, and Network Layer. The PHY layer includes the Physical Coding Sublayer, Physical Medium Attachment Sublayer, and Optical Receiver Sublayer.


In This article, we know that 40GBASE-SR4 is a standard for high-speed optical fiber communications. It operates at a rate of 40 Gbit/s over four single-mode fibers, or two strands of multimode fiber. The standard specifies the following features: It provides an upgrade path from 10G Ethernet, and 40GBASE-SR4 supports all the features of 10GBASE-SR, including wavelength multiplexing and polarization multiplexing. It has low power consumption and can be used in long reaches with low signal attenuation. If you want to know more about the optical modules, please contact QSFPTEK via QSFPTEK provides high-quality and low-price optical modules.

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