22.214.171.124. 8B/10B Encoding for GbE, GbE with IEEE 1588v2
The IEEE 802.3 specification requires GbE to transmit Idle ordered sets (/I/) continuously and repetitively whenever the gigabit media-independent interface (GMII) is Idle. This transmission ensures that the receiver maintains bit and word synchronization whenever there is no active data to be transmitted.
For the GbE protocol, the transmitter replaces any /Dx.y/ following a /K28.5/ comma with either a /D5.6/ (/I1/ ordered set) or a /D16.2/ (/I2/ ordered set), depending on the current running disparity. The exception is when the data following the /K28.5/ is /D21.5/ (/C1/ ordered set) or /D2.2/ (/C2/) ordered set. If the running disparity before the /K28.5/ is positive, an /I1/ ordered set is generated. If the running disparity is negative, a /I2/ ordered set is generated. The disparity at the end of a /I1/ is the opposite of that at the beginning of the /I1/. The disparity at the end of a /I2/ is the same as the beginning running disparity immediately preceding transmission of the Idle code. This sequence ensures a negative running disparity at the end of an Idle ordered set. A /Kx.y/ following a /K28.5/ does not get replaced.
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