Seagate ST3146854LC, ST3146756SS (FDE), ST3146356SSIM manual Shows the zero-length test load

Figure 22 shows the zero-length test load.

10 nF	50 ohm
Tx+
Probe
points
10 nF	50 ohm

Tx-

SAS internal connector

Figure 22. Zero-length test load

Figure 23 shows an ISI loss example at 3.0 Gbps.

S21 (dB)
		Compliance interconnect magnitude response and
		ISI loss example for 3.0 Gbps
0
ISI loss
> 3.9 dB
-10.9 dB		Sample compliance interconnect
0.3	1.5	Frequency (GHz)
		3.0

Figure 23. ISI loss example at 3.0 Gbps

Figure 24 shows an ISI loss example at 1.5 Gbps.

S21 (dB)
			Compliance interconnect magnitude response and ISI
0				loss example for 1.5 Gbps
	ISI loss
	> 2.0 dB
-5.4 dB					Sample compliance interconnect
						Frequency (GHz)
0.15		0.75	1.5

Figure 24. ISI loss example at 1.5 Gbps

76 Cheetah 15K.6 SAS Product Manual, Rev. B