Seagate ST973451SS, ST936751SS manual Zero-length test load, ISI loss example at 3.0 Gbps

Figure 20 shows the zero-length test load.

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

Tx-

SAS internal connector

Figure 20. Zero-length test load

Figure 21 shows an ISI loss example at 3.0 Gbps.

S 21 (dB)

0

-10.9 dB

Compliance interconnect magnitude response and

ISI loss example for 3.0 Gbps

ISI loss > 3.9 dB

Sample compliance interconnect

Frequency (GHz)

0.31.53.0

Figure 21. ISI loss example at 3.0 Gbps

Figure 22 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 22. ISI loss example at 1.5 Gbps

68 Savvio 15K SAS Product Manual, Rev. B