SCSI Termination
A terminator provides electrical circuitry at the end of a SCSI chain to prevent the reflection of electrical signals when they reach the end of the chain. The SCSI bus requires terminations only at the ends of the SCSI chain, not in the middle. There are several types of SCSI Termination: Passive, Active, Active Negation, Force Perfect Termination, and Low Voltage Differential.
The MMR/MMP should only use Active terminators. This is because active terminators involve a voltage regulator to reduce fluctuation effects in TERMPWR to insignificance. This results in more stable SCSI signals, less signal reflection and fewer data errors. Active negation terminators are most optimized for FAST and
Kingston Frame Configuration
When configuring a Kingston receiving frame the settings in Figure 1 must be used. Note: All but one setting are factory defaults. Jumpers should be installed on W3, W1 and pins 1&2 of J6 (Figure 1). Jumper W2 determines termination. In the “A” position (default) termination resistors are disabled (This is the recommended configuration for most external applications). In certain conditions it may be desirable to terminate at the frame, for example, if an internal bay is being installed in the MMR/MMP. If this is the case jumper W2 should be set in the “B” position
Figure 1
SCSI Tips for MMR/MMP Users | 4 | rev 1.0 | 1/26/99 |
