Search results
Results from the WOW.Com Content Network
By far the most popular FCS algorithm is a cyclic redundancy check (CRC), used in Ethernet and other IEEE 802 protocols with 32 bits, in X.25 with 16 or 32 bits, in HDLC with 16 or 32 bits, in Frame Relay with 16 bits, [3] in Point-to-Point Protocol (PPP) with 16 or 32 bits, and in other data link layer protocols.
A frame is "the unit of transmission in a link layer protocol, and consists of a link layer header followed by a packet." [2] Each frame is separated from the next by an interframe gap. A frame is a series of bits generally composed of frame synchronization bits, the packet payload, and a frame check sequence.
Preamble and SFD representations as bits, decimal, bytes, and nibbles Representation 56-bit (7-byte) Preamble SFD byte; uncoded on-the-wire bit pattern transmitted from left to right (used by Ethernet variants transmitting serial bits instead of larger symbols) [1]: sections 4.2.5 and 3.2.2 10101010 10101010 10101010 10101010 10101010 10101010
The frame check sequence (FCS) is a 16-bit CRC-CCITT or a 32-bit CRC-32 computed over the Address, Control, and Information fields. It provides a means by which the receiver can detect errors that may have been induced during the transmission of the frame, such as lost bits, flipped bits, and extraneous bits.
If the frame has a maximum sized address of 32 bits, a maximum sized control part of 16 bits and a maximum sized frame check sequence of 16 bits, the overhead per frame could be as high as 64 bits. If each frame carried but a single byte, the data throughput efficiency would be extremely low.
A 16-bit field set to a value of 0x8100 [b] in order to identify the frame as an IEEE 802.1Q-tagged frame. This field is located at the same position as the EtherType field in untagged frames, and is thus used to distinguish the frame from untagged frames. Tag control information (TCI) A 16-bit field containing the following sub-fields:
The two-byte Reserved field is currently unused and undefined. ... Frame Check Sequence (FCS) Flag 8 bits 8 bits 16 bits (0x8035) 32 bits 32 bits 32 bits
A composite FX.25 entity is called a "frame," distinguishing it from the AX.25 "packet" contained within. The FX.25 frame contains the following elements: - Preamble - Correlation Tag - AX.25 Packet - - AX.25 Packet Start - - AX.25 Packet Body - - AX.25 Packet Frame Check Sequence (FCS) - - AX.25 Packet End - Pad for bit-to-byte alignment - FEC ...