barcode generator code in c#.net 2: Installation, Configuration, and System Optimization in Software

Creation QR Code ISO/IEC18004 in Software 2: Installation, Configuration, and System Optimization

2: Installation, Configuration, and System Optimization
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Recall that devices in a SCSI system are chained together in a one after the other fashion Signals to a device at the end of the chain must pass through all the devices in between Because of this unique setup, special terminators, or terminating resistors, must be present to ensure signals at the end of the chain are absorbed rather than bounced back along the chain In some cases, the resistor is shaped to fit into the unused second port on the last SCSI device in the chain In other cases, the SCSI device will include an on-board terminator that is made active by using the appropriate jumper setting Essentially, any SCSI device that is not connected to two other devices must be at one end of the chain If the SCSI chain is external, the last external device and the controller must be terminated If the SCSI chain is internal only, the last internal device and the controller must be terminated Finally, if the SCSI chain is a mixture of both internal and external devices, the last external and last internal devices on the chain are terminated Many SCSI controllers include internal and external connectors for devices It is recommended that a single SCSI controller not use both the internal and external connections This may allow for more devices to be connected but may cause performance issues with the controller SCSI controllers seem to work most efficiently when 7 or less devices are connected
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SCSI systems employ a variety of cable types, depending on the SCSI type, device type, and whether the device is internal or external Furthermore, each cable type might have a different connector
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Installing and Configuring SCSI Devices
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All 8-bit SCSI systems use 50-pin cables, called A-cables Internal A-cables are 50-pin ribbon cables, which resemble IDE hard drive ribbon cables (Figure 2-5) External A-cables have either 50-pin Centronics connectors (for 5MBps systems) or 50-pin high-density connectors (for greater-than-10MBps systems) Figure 2-6 shows three different A-cable connector types
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16-Bit Systems
All 16-bit systems use 68-pin cables, also known as P-cables Before the introduction of the P-cable, 16-bit systems used an A-cable/B-cable combination Internal P-cables are ribbon cables with 68-pin connections, and external P-cables have a 68-pin high-density connector
32-Bit Systems
Although 32-bit systems are no longer supported by new SCSI specifications, you might be required to work on an older one All 32-bit systems use a 68-pin P-cable and a 68-pin Q-cable or one 110-pin L-cable The information in the Installing and Configuring SCSI Devices section has been compiled into Exercise 2-3 These are basic steps that you must perform whenever you install an external SCSI device Read the steps carefully when performing them because some are performed differently or skipped altogether for some devices
FIGURE 2-5
An internal SCSI A-cable connector
2: Installation, Configuration, and System Optimization
FIGURE 2-6
Internal and external A-cable connectors
An even larger variety of SCSI cable and connector types are available than are discussed here The list of possible combinations is beyond the scope of this book The information that you will be expected to know for the A+ exam is the following: 8-bit systems use 50-pin cables, 16-bit systems use 68-pin
cables, and 32-bit systems use 110-pin cables Internal cables (for any pin size) have the same type of connector as hard drive ribbon cables External cables (for any pin size) are typically Centronics connectors in older systems and highdensity connectors in newer systems
EXERCISE 2-3 Installing External SCSI Devices
1 Attach the device to the chain If the new device will be the last in the chain, use its cable to attach it to the device that is currently last in the chain If the device will be between two existing devices, disconnect them from each other and attach them both to the new device
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