Transcript
Andrea Wall Technical Cable Concepts, Inc. August 2008
SATA Cable Properties SATA CABLE PHYSICAL CHARACTERISTI CS SATA cabling supports high-bandwidth, differential signaling while using “twin-axial” or “twin-ax” wiring in a coax-like transmission cable (Figure 1). Cable Types: ·
Single-Lane, Twin-Axial for Internal Use
·
Multi-Lane, Twin-Axial for Internal Use
·
Multi-Lane, Twin-Axial for External Use
High-quality cables must be manufactured by reputable suppliers to ensure quality production methods and top electrical performance. It is recommended that cables are not constructed on a bench top.
Shielding & Drain Wires The method that’s used to shield cables has a profound effect on the cable’s performance and is a major factor in quality and cost. Proper Shielding: ·
Each channel has two conductors, both jacketed by a primary insulator.
·
The pair of conductors is covered completely by a conductive shield in either a solid foil or braided foil shield.
Andrea Wall Technical Cable Concepts, Inc. August 2008
·
The precision-wound, spiral-wrap foil shielding incorporates drain wires that guarantee continuity of the shield.
·
The entire assembly is covered with an insulating and protective flexible outer layer called the jacket (usually PVC).
Firm control of the shielding process is a prime factor in producing high-quality cables. Inadequate shielding causes the following: ·
Impedance Discontinuities: an unraveled shield or broken shield connections cause reflected signal energy.
·
Cross-Talk, Signal Loss, EMI (electromagnetic interference): caused by discontinuous shielding.
·
Excessive Conductor Skew: which in itself causes the above performance problems.
SATA CABLE ELECTRICAL CHARACTERISTI CS Frequency and speed mean the same thing when discussing data transmission in these second generation SATA (SATA II) cables.
High & Low Frequency Cables High Frequency Cables: The signals are transmitted down the cable quickly and: ·
Run at 3.0Gbs
·
Meet SATA specifications
Low Frequency Cables: The signals are transmitted down the cable slowly because they are: ·
Low quality cables that cannot perform at standard 3.0Gbs
·
Usually poor quality because of inadequate soldering at joints, careless cable preparation, and inferior cable and cable assembly manufacturing methods
·
Not meeting SATA specifications
Andrea Wall Technical Cable Concepts, Inc. August 2008
*Remember “High Frequency” cables meet the SATA standard for data transmission, while “Low Frequency” do not and are generally poor quality cables. SATA Cables SAS Cables Mini-SAS Cables
Andrea Wall Technical Cable Concepts, Inc. August 2008
SATA Cable Properties SATA CABLE PHYSICAL CHARACTERISTI CS SATA cabling supports high-bandwidth, differential signaling while using “twin-axial” or “twin-ax” wiring in a coax-like transmission cable (Figure 1). Cable Types: ·
Single-Lane, Twin-Axial for Internal Use
·
Multi-Lane, Twin-Axial for Internal Use
·
Multi-Lane, Twin-Axial for External Use
High-quality cables must be manufactured by reputable suppliers to ensure quality production methods and top electrical performance. It is recommended that cables are not constructed on a bench top.
Shielding & Drain Wires The method that’s used to shield cables has a profound effect on the cable’s performance and is a major factor in quality and cost. Proper Shielding: ·
Each channel has two conductors, both jacketed by a primary insulator.
·
The pair of conductors is covered completely by a conductive shield in either a solid foil or braided foil shield.
Andrea Wall Technical Cable Concepts, Inc. August 2008 ·
The precision-wound, spiral-wrap foil shielding incorporates drain wires that guarantee continuity of the shield.
·
The entire assembly is covered with an insulating and protective flexible outer layer called the jacket (usually PVC).
Firm control of the shielding process is a prime factor in producing high-quality cables. Inadequate shielding causes the following: ·
Impedance Discontinuities: an unraveled shield or broken shield connections cause reflected signal energy.
·
Cross-Talk, Signal Loss, EMI (electromagnetic interference): caused by discontinuous shielding.
·
Excessive Conductor Skew: which in itself causes the above performance problems.
SATA CABLE ELECTRICAL CHARACTERISTI CS Frequency and speed mean the same thing when discussing data transmission in these second generation SATA (SATA II) cables.
High & Low Frequency Cables High Frequency Cables: The signals are transmitted down the cable quickly and: ·
Run at 3.0Gbs
·
Meet SATA specifications
Low Frequency Cables: The signals are transmitted down the cable slowly because they are: ·
Low quality cables that cannot perform at standard 3.0Gbs
·
Usually poor quality because of inadequate soldering at joints, careless cable preparation, and inferior cable and cable assembly manufacturing methods
·
Not meeting SATA specifications
Andrea Wall Technical Cable Concepts, Inc. August 2008 *Remember “High Frequency” cables meet the SATA standard for data transmission, while “Low Frequency” do not and are generally poor quality cables. SATA Cables SAS Cables Mini-SAS Cables
