Seagate ST3300655LW manual Interface transfer rates supported, Scsi interface cable requirements

Page 65

Table 16 shows the interface transfer rates supported by the various drive models defined in this manual.

Table 16: Interface transfer rates supported

 

 

Maximum transfer rate

 

 

 

 

 

Interface type/

 

 

 

 

 

 

 

Asynchronous

 

 

Fast-20

Fast-40

Fast-80

Fast-160

drive models

Fast-5

Fast-10

(Ultra)

(Ultra2)

(Ultra160)

(Ultra320)

 

 

 

 

 

 

 

 

 

SE

ST3300655LW/LC

 

 

 

 

 

 

 

 

ST3146855LW/LC

yes

yes

yes

yes

no

no

no

 

ST373455LW/LC

 

 

 

 

 

 

 

LVD

ST3300655LW/LC

 

 

 

 

 

 

 

 

ST3146855LW/LC

yes

yes

yes

yes

yes

yes

yes

 

ST373455LW/LC

 

 

 

 

 

 

 

10.6.3SCSI interface cable requirements

The characteristics of cables used to connect parallel interface drives are discussed in the ANSI standards ref- erenced in this section.

10.6.3.1Cable requirements

The characteristics of cables used to connect Ultra320 SCSI parallel interface devices are discussed in detail in Section 6 of ANSI Standard T10/1365D Rev. 3. The cable characteristics that must be considered when interconnecting the drives described in this manual in a Ultra320 SCSI parallel, daisy-chain interconnected system are:

•characteristic impedance (see T10/1365D Sections 6.3.3 and 6.3.4)

•propagation delay (see T10/1365D Sections 6.3.6 and 6.3.7)

•stub length (see T10/1365D Section 6.9)

•device spacing (see T10/1365D Section 6.9)

To minimize discontinuances and signal reflections, cables of different impedances should not be used in the same bus. Implementations may require trade-offs in shielding effectiveness, cable length, number of loads and spacing, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially important in order to maintain adequate margin at FAST-20, FAST- 40, FAST-80, and FAST-160 SCSI transfer rates.

Note. For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair cables are strongly recommended. For Fast-80 and Fast-160 operation, twisted pair cables are required.

LC Models

The 80-pin connector option provided on LC models is intended for use on drives that plug directly into back- plane connector in the host equipment. In such installations, all backplane wiring segments are subject to the electromagnetic concepts presented in Standard T10/1365D, Rev. 3, Section 6. For LC model drives, installa- tions with connectors on cables are not recommended.

10.6.4Mating connectors

Part numbers for the different type connectors that mate with the various Cheetah 15K.5 SCSI I/O connectors are given in the sections following.

Cheetah 15K.5 SCSI Product Manual, Rev. J

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Contents Cheetah 15K.5 Scsi Page Contents Interface requirements Defect and error managementInstallation List of Figures Page Seagate Online Support and Services Seagate Technology support servicesScope Standards Applicable standards and reference documentationElectromagnetic compatibility Electromagnetic susceptibilityEuropean Union Restriction of Hazardous Substances RoHS Electromagnetic complianceReference documents General description Drive model number vs. differentiating featuresMedia characteristics Standard featuresFormatted capacities PerformanceReliability Options factory installed Factory installed accessoriesAccessories Programmable drive capacityScsi performance characteristics visible to user Performance characteristicsInternal drive characteristics transparent to user Seek time Format command execution time minutesGeneralized performance characteristics Cache operation Start/stop timePrefetch/multi-segmented cache control Prefetch operation Caching write dataError rates Reliability specificationsRecoverable Errors Unrecoverable ErrorPreventive maintenance Reliability and serviceSeek errors 4 S.M.A.R.T Hot plugging Cheetah 15K.5 Scsi disc drivesPerformance impact Controlling S.M.A.R.TMilliseconds Reporting controlDrive Self Test DST Temperature Log page 0Dh Parameter Code DescriptionThermal monitor DST Failure Definition State of the drive prior to testingImplementation Invoking DSTShort test Function Code 001b Product warrantyExtended test Function Code 010b Log page entriesProduct repair and return information ShippingAC power requirements Physical/electrical specificationsDC power requirements ST3300655LC DC power requirementsST373455LC DC power requirements ST3146855LC DC power requirementsCurrent profile Power sequencingConducted noise immunity Typical ST3300655LW drive +12V LVD current profile ST3300655LW/ST3300655LC Power dissipationST3146855LW/ST3146855LC ST3146855LC DC current and power vs. Iops LVDST373455LW/ST373455LC ST373455LC DC current and power vs. Iops LVDEnvironmental limits Temperature a. OperatingRelative humidity Effective altitude sea level a. OperatingShock Shock and vibrationRecommended mounting Corrosive environment Air cleanlinessVibration a. Operating-normal Acoustics Mechanical specificationsLC mounting configuration dimensions Drive internal defects Defect and error managementDrive error recovery procedures Read and write retry count maximum recovery times Media Pre-Scan Scsi systems errorsBackground Media Scan Idle Read After Write Deferred Auto-ReallocationConfigure drive options InstallationDrive ID/option select header FormattingJ5 jumper header on LW models only Drive Front RES Function descriptionCooling Drive orientationGrounding Drive mountingGeneral description Interface requirementsScsi interface messages supported Scsi messages supported by Cheetah 15K.5 Scsi family drivesCommands supported by Cheetah 15K.5 Scsi family drive Scsi interface commands supportedCommands supported by Cheetah 15K.5 Scsi family drive Commands supported by Cheetah 15K.5 Scsi family drive Commands supported by Cheetah 15K.5 Scsi family drive Inquiry Vital Product data Cheetah 15K.5 Scsi family drive Standard Inquiry dataMode Sense data Mode Sense Pages Data ST3300655 Mode sense dataMode Sense Header Data Mode Sense Pages Data ST3146855 Mode sense dataST373455 Mode sense data Scsi bus conditions and other miscellaneous features Scsi bus conditions and miscellaneous features supportedPhysical interface Synchronous data transferDC cable and connector Scsi interface physical description Interface transfer rates supported Mating connectorsScsi interface cable requirements Cable requirementsMating connectors for LC model drives Mating connectors for LW model drivesScsi daisy-chain interface cabling for LW drives Right-angle to Pcba connectorsNonshielded 68-pin Scsi device connector used on LW drives Nonshielded 80-pin Scsi SCA-2 connector used on LC drives GND LW 68-conductor LVD P cable signal/pin assignments Active LED OUT 4 LC 80-pin single-ended SE I/O connector pin assignments+5 V Charge GND Active LED OUT 4 LC 80-pin single-ended LVD I/O connector pin assignmentsMultimode-SE and LVD alternatives LVD output characteristicsElectrical description General cable characteristics LVD Input characteristicsCable characteristics for single-ended circuits Single-ended drivers/receiversTwist-n-flat cables-into a multi-drive backplane Cables for low voltage differential drivers/receiversLC drives Terminator requirements Terminator powerLW drives Disc drive Scsi timing Disc drive Scsi timingDisc drive Scsi timing Drive activity LED Drive activity LED status Spindle status Command statusNumerics SymbolsPage Page Scsi Page Page
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