Seagate ST3400755SS manual Shows the zero-length test load

Figure 34 shows the zero-length test load.

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

Tx-

SAS internal connector

Figure 34. Zero-length test load

Figure 35 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 35. ISI loss example at 3.0 Gbps

Figure 36 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 36. ISI loss example at 1.5 Gbps

64 Cheetah NS SAS Product Manual, Rev. B