Table 1-2. Ethernet Cabling Types
Type of Cable
Key Pins Connected
T568A (both ends) or T568B (both ends)
1 1; 2 2; 3 3; 6 6
T568A on one end, T568B on the other
1 3; 2 6; 3 1; 6 2
Table 1-3. Ethernet Header Fields
Provides synchronization and signal transitions to allow proper clocking of the transmitted signal. Consists of 62 alternating 1s and 0s, and ends with a pair of 1s.
Preamble and Start of Frame Delimiter (802.3)
Same purpose and binary value as DIX preamble; 802.3 simply renames the 8-byte DIX preamble as a 7-byte preamble and a 1-byte Start of Frame Delimiter (SFD).
Type (or Protocol Type) (DIX)
2-byte field that identifies the type of ...