Compaq AA-RHGWB-TE manual Standalone Scsi Signal Converter, DS-BA35X-DA Termination

Figure 9–1: Standalone SCSI Signal Converter

TT

Single-ended

sideDifferential side with trilink attached

ZK-1050U-AI

Figure 9–2 shows the status of internal termination for an SBB SCSI signal converter that has a trilink connector attached to the differential side.

Figure 9–2: SBB SCSI Signal Converter

T

T

Single-ended side

Differential side with trilink attached

ZK-1576U-AI

9.1.2.2 DS-BA35X-DA Termination

The UltraSCSI BA356 shelf uses a 16-bit differential UltraSCSI personality module (DS-BA35X-DA) as the interface between the UltraSCSI differential bus and the UltraSCSI single-ended bus in the UltraSCSI BA356.

The personality module controls termination for the external differential UltraSCSI bus segment, and for both ends of the internal single-ended bus segment.

For normal cluster operation, the differential termination must be disabled since a trilink connector will be installed on personality module connector JA1, allowing the use of the UltraSCSI BA356 (or two UltraSCSI BA356s) in the middle of the bus or external termination for an UltraSCSI BA356 on the end of the bus.

Switch pack 4 switches S4-1 and S4-2 are set to ON to disable the personality module differential termination. The switches have no effect on the BA356 internal, single-ended UltraSCSI bus termination.

9–4Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices