contador Saltar al contenido

Difference between Fast Ethernet and Gigabit Ethernet

An Ethernet mainly a group of LAN technologies which are covered in the IEEE 802.3 u standard. Ethernet is easily managed and managed and considered a low cost network implementation solution. available in three variants, 10Base-T ethernet, fast Ethernet and Gigabit Ethernet. The main difference between fast Ethernet and Gigabit Ethernet is the contradictory speed in which fast Ethernet provides up to 100 Mbps data rate while Gigabit Ethernet offers high speed data transmission up to 1 Gbps.

Comparative chart

Basis for comparison Fast Internet Gigabit Ethernet
BasicIt offers a speed of 100 Mbps.Provide a speed of 1 Gbps.
DelayGenerate more delay.Less in comparison.
ConfigurationSimpleComplicated and creates multiple mistakes.
coverageIt can cover distances up to 10 km.It has the limit of 70 km.
Report10-Base-T Ethernet successor.A fast Ethernet successor.
Return delay100-500 bits of time4000 bits of time

Definition of Fast Ethernet

L' Fast Ethernet was conceived under the name 802u to compete for the LAN FDDI protocol. completely based on 10-Base-T Ethernet as a successor of 10-Base-T Ethernet. It was popular because it was simple to implement, manage and maintain. Fast Ethernet has the advantage of backwards compatibility. ten times faster than its successor and capable of providing a data transmission speed of 100 Mbps. There are three varieties of fast Ethernet: 100Base-T4, 100Base-Tx is 100Base-Fx .

The MAC layer of fast Ethernet other than the Ethernet standard in which the data rate and collision domain are altered. The data rate is increased by a factor of 10 and the collision rate is decreased by a factor of 10. Although there are no changes in the frame format, how can you get a speed ten times faster without changing the frame format? To do this, the RTT (Round trip time) decreased from 57, 6 to 5, 76 microseconds.

The time it takes for a signal pulse or packet to travel from a particular source to a particular destination and the return from there again known as Round trip time or Round trip delay .

Definition of Gigabit Ethernet

The Gigabit Ethernet was designed to provide higher transmission speeds of up to 1 Gbps. The previous intention was to develop a technology capable of working properly on existing network equipment . built on top of Ethernet protocols such as CSMA / CD. Both modes are full duplex and half duplex supported by it, similar to the fast ethernet network.

Initially, multi-mode fiber optics and short-range coaxial cable are used. Subsequently, the standards of twisted pair cables were also included. Gigabit rates are achieved using physical channel technology as the standard for fiber optics.

Major improvements or changes in Gigabit Ethernet compared to its predecessor are shown below:

  • The fiber optic cable it is mainly used in place of the coaxial cable and the twisted pair cable.
  • The MAC layer has also been changed to gigabit ethernet. Use the carrier extension to detect frames from a greater distance.
  • To manage the flow control are used the X-on / X-off protocols, which work on any full-duplex Ethernet. This helps stop the transmission when a switching buffer is near its capacity.
  • There quality of service (QoS) supported by gigabit ethernet with the help of the signaling scheme so that the packets in real time get the best treatment.

Key differences between Fast Ethernet and Gigabit Ethernet

  1. The data rate provided by Fast Ethernet up to 100 Mbps. On the other hand, gigabit ethernet offers up to 1 Gbps speed.
  2. As the speed is increased in Gigabit Ethernet, the delay is decreased while the speed of the Ethernet network generates more delay.
  3. Fast Ethernet configuration simpler than Gigabit Ethernet.
  4. The distance traveled by a fast ethernet network at most 10 km. In contrast, the gigabit ethernet covers 70 km.
  5. The round-trip delay of fast Ethernet 100-500 times. By cons, Gigabit Ethernet has a 4000 bit delay.


Fast Ethernet and Gigabit Ethernet are the types of Ethernet on which Fast Ethernet slower than Gigabit Ethernet and offer maximum data transmission speeds of up to 100 Mbps. On the other hand, Gigabit Ethernet has extended its speed up to 1 Gbps improving cabling technology, the MAC layer, the flow control protocols and the quality of the service.