Installation guide

AcceleRAID 250 Termination
2-4 AcceleRAID Installation Guide
AcceleRAID 250 Termination
The AcceleRAID 250 is equipped with automatic SCSI termination
circuitry. If the controller is at the end of the SCSI bus, it automatically
enables on-board termination.
If all the SCSI devices on the channel are connected either to the internal
connector or to the external connector, the end of the SCSI bus farthest from
the controller must have a terminator installed. In this case, the controller
automatically enables on-board termination. See Figure 2-3 for examples of
internal or external drive configurations.
If some SCSI devices on the channel are connected to the internal connector,
and some are connected to the external connector, the two ends of the SCSI
bus farthest from the controller must each be terminated. In this case, the
controller automatically disables on-board termination. See Figure 2-3 for an
example of an internal – external drive configuration.
☛
Note
The illustrated internal and external connectors are
both on the same channel.
It is better to terminate the ends of the SCSI bus itself
than it is to terminate the end devices on the bus. This
allows hot swap devices to be added or removed from
the SCSI bus without affecting termination.