1.1 Topologies in SAS Interface

1.1.1 SAS Layering

As shown in Figure 1.2, for SAS, the following six control layers are defined:

∙ Physical layer:

Electric properties related to cables, connectors,

 

and signals

Phy (transceiver) layer: 8B/10B code, OOB, and speed negotiation

Link layer:

Primitives, address frames, and connection control

Port layer:

Wide port control

Transport layer:

Frame control

Application layer:

SCSI commands, mode pages, and log pages

Application layer

Transport layer

Port layer

Link layer

Phy layer

Physical layer

Figure 1.2 SAS control layers

C141-C013

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Fujitsu MBA3300RC, MBC2036RC, MBC2073RC, MBA3147RC, MBA3073RC specifications SAS Layering, Topologies in SAS Interface