Adaptec asr-6805e rohs kit [71/116] What s a phy
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Adaptec asr-6805e rohs kit [71/116] What s a phy

Adaptec asr-6805e rohs kit [71/116] What s a phy
Wide
Port
Wide
Port
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Narrow
Port
Phy
Receiver
Transmitter Narrow
Port
SAS DeviceSAS Device
SAS Device
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Phy
Receiver
Transmitter
Wide
Port
Wide
Port
SAS Device
link
What’s a Phy?
Phys are part of the physical communication connection between SAS devices. Each phy contains a
transceiver that sends data back and forth between SAS devices.
When a connection is formed between two end devices, a link is established from a phy in one port to
a phy in the other port. As shown in the gure above, a wide port can support multiple independent
links simultaneously.
Phys are internal, within SAS connectors (see What’s a SAS Connector? on page 72).
SAS cables physically connect one or more phys on one SAS device to one or more phys on another SAS
device.
What’s a SAS Port?
Note: Because the physical link between SAS devices is from phy to phy, rather than
port to port, a “port” is more of a virtual concept, different from what is normally
considered a port on other types of RAID controllers and storage devices.
A port is one or more phys. A narrow port contains one phy. A wide port typically contains four phys.
Each port has its own unique SAS address (see How are Disk Drives Identied in SAS? on page 72), and
all the phys in a port share that same SAS address.
SAS card port options vary. A SAS card with four phys could be congured with one wide port, with two
wide ports that comprise two phys, or with four narrow ports each containing one phy. (A wide port
with four phys is referred to as a 4-wide or 4x port.)
What’s a SAS Address?
Each SAS port is identied with a unique SAS address, which is shared by all phys on that port.
For example, a SAS disk drive might have two narrow ports. Each port has one unique SAS address. The
single phy in each port uses its port’s SAS address.
In another example, a SAS device might have one 4-wide port. That port has one SAS address, which is
shared by all four phys in the port.
71Proprietary and Condential to PMC-Sierra, Inc., and for its customers.
Document No.: CDP-00310-01-A Rev. A, Issue
Serial Attached SCSI RAID Controllers Installation and User's Guide

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