Ethernet

Crossover Pins: 1+3 & 2+6 Auto Negotiate Speed: Fast Link Pulses (FLP)

=Framing=


 * ===Options===
 * DIX / 802.3(1997)
 * Preamble(8), Destination(6), Source(6), Type/Length(2), Data, FCS(4)
 * 802.3 - Media Access Control
 * Preamble(7), SD(1), Destination(6), Source(6), Length(2), FCS(4)
 * 802.2 - Logical Link Control
 * DSAP(1), SSAP(1), Control(1-2)
 * Sub Network Access Control (SNAP)
 * OUI(3), Type(2)
 * ===Fields===
 * Preamble - synchronization; proper clocking; alternating 1s and 0s; ends with pair of 1s
 * Control - generally 0x03
 * OUI - generally unused; manufacturer identifier of NIC
 * Type(snap) - overcomes deficiencies with size of DSAP
 * Destination Service Access Point -
 * Source Service Access Point - describes upper layer protocol

=Addressing=


 * ===Bytes===
 * 1st: most significant byte
 * 1st - 3rd: oui
 * 4th - 6th: vendor assigned
 * 6th: least significant byte
 * ===Bits (reverse significant bit order called canonical/little-endian)===
 * 1st: least significant bit
 * 8th: most significant bit
 * 7th: u/l; 0 means vendor assigned; 1 means multicast/broadcast
 * 8th: i/g; 0 means unicast; 1 means multicast

=Standards=


 * 10base5 - thicknet; coaxial; 500m
 * 10base2 - thinnet; coaxial; 185m
 * 10baseT - twisted pair; 100m
 * 100baseFX - multimode; 400m
 * 100baseT - 2 pair; 100m
 * 100baseT4 - 4 pair; 100m
 * 100baseTX - 2 pair; 100m
 * 1000baseLX - laser; mm & sm; 10km(sm); 3km(mm); long
 * 1000baseSX - laser; mm; 220-250m; short
 * 1000baseZX - extended wavelength; sm; 100km
 * 1000baseCS - stp; 2 pair; 25km
 * 1000baseT - utp; 4 pair; 100m
 * 802.2 - logical link control
 * 802.3 - media access control
 * 802.3u - fastethernet (100Mbps); copper & optical
 * 802.3z - gig over optical
 * 802.3ab - gig over copper