Compaq AA-RHGWC-TE manual Using the Scsi Bus Signal Converters

but you would waste a disk slot and it would not work with a KZPBA-CB if there are any UltraSCSI disks in the storage shelves.

The following sections discuss the DWZZA and DWZZB signal converters and the DS-BA35X-DA personality module.

9.1.2 Using the SCSI Bus Signal Converters

The DWZZA and DWZZB signal converters are used in the BA350 and BA356 storage shelves. They have removable termination. The DS-BA35X-DA personality module is used in the UltraSCSI BA356. It has switch selectable differential termination. The single-ended termination is active termination.

The following sections describe termination for these signal converters in more detail.

9.1.2.1 DWZZA and DWZZB Signal Converter Termination

Both the single-ended side and the differential side of each DWZZA and DWZZB signal converter has removable termination. To use a signal converter, you must remove the termination in the differential side and attach a trilink connector to this side. To remove the differential termination, remove the five 14-pin termination resistor SIPs (located near the differential end of the signal converter). You can attach a terminator to the trilink connector to terminate the differential bus. If you detach the trilink connector from the signal converter, the shared SCSI bus is still terminated (provided there is termination power).

You must keep the termination in the single-ended side to provide termination for one end of the BA350 or BA356 single-ended SCSI bus segment. Verify that the termination is active. A DWZZA should have jumper J2 installed. Jumpers W1 and W2 should be installed in a DWZZB.

Figure 9–1 shows the status of internal termination for a standalone SCSI signal converter that has a trilink connector attached to the differential side.

Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices 9–3