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The frame check sequence (FCS) is a four-octet cyclic redundancy check (CRC) that allows detection of corrupted data within the entire frame as received on the receiver side. According to the standard, the FCS value is computed as a function of the protected MAC frame fields: source and destination address, length/type field, MAC client data ...
A frame is a series of bits generally composed of frame synchronization bits, the packet payload, and a frame check sequence. Examples are Ethernet frames, Point-to-Point Protocol (PPP) frames, Fibre Channel frames, and V.42 modem frames. Often, frames of several different sizes are nested inside each other.
It is one bit in length and is used for two purposes: It is set to 1 in a non-QoS data frame transmitted by a non-QoS WLAN station to indicate the frame being transmitted is using Strictly-Ordered service class (this use is obsolete and will be removed from the future 802.11 Standard).
The size of the payload of non-standard jumbo frames, typically ~9000 Bytes long, collides with the range used by EtherType, and cannot be used for indicating the length of such a frame. The proposition to resolve this conflict was to substitute the special EtherType value 0x8870 when a length would otherwise be used. [ 2 ]
A maximum 2048 byte long field (payload) contains the information to be transferred from a source N_Port to a destination N_Port. The 4 byte Cyclic Redundancy Check (CRC) precedes the End of Frame (EOF) delimiter. The CRC is used to detect transmission errors. The maximum total frame length is 2148 bytes.
GFP utilizes a length/HEC-based frame delineation mechanism that is more robust than that used by High-Level Data Link Control (HDLC), which is single octet flag-based. There are two types of GFP frames: a GFP client frame and a GFP control frame. A GFP client frame can be further classified as either a client data frame or a client management ...
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Data length code (DLC) 4: Number of bytes of data (0–64 bytes) [a] Data field: 0–512 (0-64 bytes) Data to be transmitted (length in bytes dictated by DLC field) CRC: 15: Cyclic redundancy check: CRC delimiter: 1: Must be recessive (1) ACK slot: 1: Transmitter sends recessive (1) and any receiver can assert a dominant (0) ACK delimiter: 1 ...