1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
Intel Confidential 109
Worst-Case Cable for Jitter
Table C-1. Constructed Jitter Test Cable Segments Lengths
Cable Segment / Type Meters Feet Inches Notes
L1 (constructed cable) 1.20 3.94 47.24 3 feet, 11.24 inches
L2 (quality CAT5 cable) 117.7 386.15 4633.85 386 feet, 1.85 inches
L3 (constructed cable) 1.48 4.86 58.27 4 feet, 10.27 inches
TOTAL CABLE 120.38
Table C-2. Constructed Jitter Test Cable Delay Specifications
Delay Cable Type
4.75 nsec/meter Quality CAT5 cable
4.673935 nsec/meter Constructed cable
10.8 nsec Constructed cable segments L1 and L3 (L1 + L3 = 1.20 + 1.48 = 2.68 meters)
559.2 nsec
Quality CAT5 cable of segment L2.
(117.72632 meters of standard CAT5 cable is required for a 559.2 nsec
delay.)
Table C-3. Average Insertion Loss Comparison
16 MHz 31.25 MHz 50 MHz 80 MHz 100 MHz
Quality CAT5 cable of 120 meters 8.61 12.22 15.62 20.08 22.73
Quality CAT5 cable of 117.7 meters 8.44 11.99 15.32 19.7 22.29
Constructed cable of 2.68 meters 0.18 0.24 0.33 0.48 0.46
Total Insertion Loss of
117.7 m quality CAT5 cable +
2.68 m constructed cable
8.62 12.23 15.65 20.18 22.76
IEEE specification maximum
Insertion Loss
9.13 12.98 16.64 21.33 24
Table C-4. Constructed Jitter Test Cable Average Insertion Loss per 9.9062 Meters
16 MHz 31.25 MHz 50 MHz 80 MHz 100 MHz
rb 0.6333 0.8905 1.1827 1.632 1.6982
vg 0.6695 0.9165 1.262 1.9602 1.7455
blbr 0.6674 0.8969 1.1465 1.8189 1.6671
gw 0.6896 0.8907 1.219 1.7077 1.7382
Average 0.66 0.90 1.20 1.78 1.71
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