Cabling External Devices

Be certain to use high quality differential cable for all your external LVD/SE connections. When running in LVD mode (LVD LED indicator ON), your total LVD bus must be kept to 12 meters for multi-drop connections. If the bus is being used in SE mode (LVD LED indicator OFF), the bus must be kept to 1.5 meters. You must provide LVD termination at the end of the external bus.

Ultra2 SCSI

Differential Cable

Ultra2 SCSI

LVD/SE Terminator (External)

Ultra2 SCSI LVD

Ultra2 SCSI LVD/SE

External Devices

External Connector

Figure 10: External Ultra2/LVD Devices

SUNCluster™ Cabling Examples

The SCSI cable shall not exceed 1.5M total length if the bus is running in Single Ended Mode, or 6M Ultra2/LVD Mode and needs correct termination at each end of the cable. There is a short internal cable inside the box, which connects the IntraServer rear transition card internal connector to the Cable adapter at the rear end of the HDD (see the cabling diagrams below).

There is ONE external cable per SCSI channel, which connects the two System boxes. SCSI terminators are required at each end of the cable. This is achieved by enabling the auto terminators on the SCA adapters. The same arrangement may be repeated for the second SCSI chain.

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