Compaq TruCluster Server AA-RHGWB-TE, Manual

Page: 254 / 320

Figure 9–1: Standalone SCSI Signal Converter
ZK-1050U-AI
T T
Single-ended
Differential side with trilink
attached
side
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
ZK-1576U-AI
T
T
Single-ended
Differential side with trilink
attached
side
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.
9–4 Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices