4.17.1 SQI+ to BER Correlation

The Table 4-3 below shows the relations between SQI and Bit-Error-Rate (BER) according to the OPEN Alliance Advanced Diagnostic Features for 10BASE‑T1S Automotive Ethernet PHYs specification. The BER is calculated assuming white Gaussian noise with a bandwidth of 40 MHz.

Note: The following table is derived from characterized sames and is provided for informative purposed only.
Table 4-3. LAN8670/1 SQI+ to BER Correlation
SQIP Field ValueSQI+2BER for AWG noise model (informative)3
Binary (R)1Decimal
00000111 03.13BER > 10-2
00001111 16.25
00010111 29.38
00011111 312.50BER > 10-3
00100111 415.63
00101111 518.75
00110111 621.88
00111111 725.00
01000111 828.13
01001111 931.25
01010111 1038.38
01011111 1137.50
01100111 1240.63
01101111 1343.75
01110111 1446.88BER > 10-4
01111111 1550.00
10000111 1653.13
10001111 1756.25BER > 10-5
10010111 1859.38
10011111 1962.50
10100111 2065.63BER > 10-6
10101111 2168.75
10110111 2271.8810-10 < BER < 10-6
10111111 2375.00
11000111 2478.13
11001111 2581.25BER < 10-10
11010111 2684.38
11011111 2787.50BER < 10-13
11100111 2890.63BER < 10-17
11101111 2993.75
11110111 3096.88
11111111 31100.00
Note:
  1. The 5‑bit SQIP field is left justified and ‘1’ padded to represent an unsigned 8‑bit fixed-point integer, R.
  2. The SQI+ value ranges from zero to 100% and is computed by the formula SQI+ = 100⁢⋅(R+1)/ 256. Refer to the OPEN Alliance Advanced Diagnostic Features for 10BASE‑T1S Automotive Ethernet PHYs Specification for more information.
  3. Characterized on samples.