Because the DME signaling rate for these two fields is reduced by a factor of 8, each coefficient and status transmission contain 128/8 = 16 bits, each numbered from 15-0. The following tables define these bits in the order in which they are transmitted starting with bit 15 and ending with bit 0.
Bits | Name | Description | ||
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15:14 | Reserved | Transmitted as 0, ignored on reception. | ||
13 | Preset |
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12 | Initialize |
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11:6 | Reserved | Transmitted as 0, ignored on reception. | ||
5:4 | Coefficient (+1) update |
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3:2 | Coefficient |
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1:0 | Coefficient (-1) update |
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Bits | Name | Description | ||
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15 | Receiver ready |
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14:6 | Reserved | Transmitted as 0, ignored on reception. | ||
5:4 | Coefficient (+1) update |
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3:2 | Coefficient (0) update |
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1:0 | Coefficient (-1) update |
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The functions of each bit are defined in IEEE 802.3 Clause 72, “72.6.10.2 Training frame structure”. Their purpose is to communicate the adjustments of the transmit equalizer during the process of link training. The corresponding signal names are defined in Port Descriptions.