Low Voltage Differential SCSI to High Voltage Differential SCSI Converter

Feature Ultra SCSI capable Initiators and targets may be placed on either side of the device. Works both ways, as an LCD to HVD convertor or a HVD to LVD converter. Does not consume a SCSI ID. Transparent operation, independent of host software. LVD side switches to single-ended mode automatically if plugged into an SE bus. Hot-swap mode, where each side can be electrically isolated from each other Integral Multimode LVD terminators that sense the LVD bus and switch to SE mode as appropriate. Supplies terminator power out to each bus via a jumper and resetable fuse. SCSI bus signals are regenerated and re-timed.

Applications

• To connect HVD SCSI devices to either a LVD or SE controller.
• To connect LVD SCSI devices to an HVD controller so that the LVD bus remains a true LVD
• To connect SE SCSI devices to an HVD controller.

Other uses:

• Creating bus segments that are electrically isolated from each other.
• Bus extending, where an LVD SCSI bus can be lengthened to 60M by adding converters in serial.
• Enabling server clustering.

Overview

The BA1000 is a true wide high voltage differential, HVD to low voltage differential, LVD converter, where the LVD side is not degraded to become a single ended SCSI bus.

It is packaged in a small desktop enclosure, 174 x 62 x 245mm. The enclosure has its own integral power supply and quit fan, so can be sited virtually anywhere. The power supply will accept 100 - 240V, 50 - 60Hz, automatically ranging.

LED Indicators

• Presence of Termpower for each bus
• Bus error, where a device of the wrong type, HVD, LVD SE is plugged into either bus
• SCSI activity indicator

Specifications

Quick Start

Note:

The BA1000 enclosure is factory set to be internally terminated on both the LVD and HVD sides. It is also jumpered internally to supply termpower out to the buses in both directions

1. Install LVD HVD SCSI cables.
2. Install power cable and switch on

Internal Board Setup

Termination

Note that the internal terminators are provided on the LVD side and that they are normally enabled, unless J% is jumpered. Termination on the HVD side is provided externally by a plug-in daughter card or cable terminator.

Termination Power

Termpower can be provided from the board with J4 for the LVD side, J6 for the HVD side.

Pass SCSI Resets

Jumper LK1 the 2 pins furthest from the power connector.

Jumpers

Reset Handling, LK1, 3 pin jumper,

• Link 2 pins furthest from the power connector to pass SCSI resets normally.
• Link 2 pins closest to the power connector to inhibit resets coming from the LVD side back to a HVD host, useful for SCSI networks.

LED's

Note that when installing the SCSI connectors in the PCB, support the board from underneath so as not to flex the board too much.