SAS Expander

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In addition to a direct communication between a SAS controller and SAS/SATA devices, the Serial Attached SCSI (SAS) protocol allows the use of so-called SAS Expanders. Like switches of an Ethernet network, SAS expanders enable you to connect a larger number of devices (more SAS/SATA devices to a single SAS controller).[1]

LSI SAS Expander ICs

LSI offers the following SAS Expander chips:[2]

Expander IC SAS version Number of
SAS ports
supported
SAS data rates
supported
SATA data rates
LSISASx12 SAS 3Gb/s
(„SAS 1“)
12 3 Gb/s 1,5 Gb/s,
3 Gb/s
LSISASx12A 12
LSISASx28 28
LSISASx36 36
LSISAS2x24 SAS 6Gb/s
(„SAS 2“)
24 3 Gb/s,
6 Gb/s
1,5 Gb/s,
3 Gb/s,
6 Gb/s
LSISAS2x28 28
LSISAS2x36 36

References

  1. Serial attached SCSI - SAS Expanders (en.wikepedia.org)
  2. LSI Standard Product ICs (see section 'SAS Expander ICs')

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