What is RS FEC in Ethernet?
Product Description. The Multi-Channel 25G Reed-Solomon Forward Error Correction implements the Reed-Solomon Forward Error Correction (RS-FEC) sublayer for one to four 25G Ethernet channels, making use of the hard 100G RS-FEC IP block in the Xilinx® UltraScale+™ devices.
Does FEC add latency?
FEC does not only add latency: the variation of frame offset within an FEC block is accumulated over each hop and results in jitter. This is best demonstrated by examining the latency added by FEC when Figure 7: Latency as a function of frame size.
What is FC FEC and RS-FEC?
Reed-Solomon (RS) is a ‘stronger’ FEC and is most prevalent. Firecode (FC), also known as BASE-R or Clause 74 FEC, is a ‘weaker’ FEC but introduces less latency on the link when used in comparison to RS-FEC. The strength of a FEC is typically characterized by the worst case BER that it can correct.
What is FEC 100G?
Application of FEC in 100G Networks In the context of fiber-optic networking, FEC is used to address optical SNR (OSNR) – one of the key parameters that determine how far a wavelength can travel before it needs regeneration.
Why do we need FEC?
Because FEC does not require handshaking between the source and the destination, it can be used for broadcasting of data to many destinations simultaneously from a single source.
How much latency does FEC add?
As Figure 1 shows, at 25Gb/s the additional latency contributed by FEC is at the order of a frame traversal through a commodity cut-through switch [25], and twice the latency through a state-of- the-art switch [9].
Why is FEC required?
FEC is especially important at high-speed data rates, wherein advanced modulation schemes are required to minimize dispersion and signal correspondence with the frequency grid. Without the incorporation of FEC, 100G transport would be limited to extremely short distances.
How does 40G Ethernet work?
40G Ethernet Overview The standard enables Ethernet frames to be transmitted at a rate of 40 Gbit/s. At the same time, it addresses physical layer specifications for communication across backplanes, copper cabling, multimode fiber, and single mode fiber.
What is FEC mode?
Forward error correction (FEC) is a method of obtaining error control in data transmission in which the source (transmitter) sends redundant data and the destination (receiver) recognizes only the portion of the data that contains no apparent errors.
What is FEC ratio?
Forward error correction is applied to the customer’s information data at the transmit end. so transmission data rate = customer information rate x 1/ (FEC rate). FEC rate is typically in the range 1/2 to 7/8 so the transmission data rate is always significantly more than the customer information rate.
What does 40gb S mean?
A 40G switch generally refers to the data speeds of the ports feeding into the switch. Hence, 40 Gb/s has 40 Gb/s ports. The overall switching capacity of the 40 Gb/s switch will be much higher depending on the total number of ports and the power of the switching fabric itself.