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Paralan SCSI 

MH-32 / MH-33
SCSI U320 to HVD Converters

  Models MH32, MH33 Paralan’s Series 80 models MH16 / MH17 let you add LVD devices into an existing High Voltage Differential (HVD) system, or utilize existing HVD devices in an LVD/MSE or single-ended system. The Converter may also be used to extend the SCSI bus length of an LVD/MSE system. All this is accomplished without any impact on SCSI protocol or loss of data thruput!
  • Convert Between LVD or Single-ended 
    and HVD
  • Extend Bus Length
  • Isolate HVD Segments of a SCSI bus
 
  • Stand-alone and Board-level Versions Available:
    The stand-alone Model MH32 includes a power supply for standard power line operation.
    The board-level version Model MH17 is sized to fit in a standard 5.25" drive bay!Click here for mechanical drawings
  • Targets and initiators may be located on both sides of the Expander
  • The Series 80 models are backward compatible with older versions of SCSI
  • Does not consume a SCSI ID
Interconnect HVD and Ultra320 Devices
Paralan’s models MH32A / MH33A let you add U320 devices into an existing High Voltage Differential (HVD) system, or utilize existing HVD devices in an Ultra320 or single-ended system. All this is accomplished without any impact on SCSI protocol or loss of data thru put.

Using Ultra320 Devices in an Existing HVD System

SCSI protocol allows all SCSI implementations i.e. LVD/SE and HVD to communicate in the same SCSI domain. This is accomplished through the use of the DIFFSENSE signal. However, the performance level is reduced by the slower devices and the shortest cable length on the segment. This huge penalty is avoided by using a type of SCSI Expander usually referred to as a Converter. As an example; a SCSI converter is placed between an Ultra 320 device and an HVD device. This isolates the different versions of SCSI into two segments allowing the both the Ultra320 device and the HVD device to function at their full designed levels.
Using Ultra320 Devices in an Existing HVD System!
Using HVD (High Voltage Differential) Devices in an Ultra320 System

HVD Devices can be added to an Ultra320 or Single-ended system simply by adding a Ultra320 to HVD Converter, attaching the HVD SCSI segment to the HVD port of the Converter. A MH32 will not consume a SCSI ID, and the system will operate with no compromise of thru put.
Using HVD (High Voltage Differential) Devices in an Ultra320 System
Mixing SCSI Device Types

Multimode LVD SCSI will automatically change to Single-Ended (SE) if an SE device is on the same bus segment. However, neither LVD nor SE SCSI can directly communicate with HVD SCSI. A Model MH32A or MH33A Ultra320 to HVD SCSI Converter enables this type of communication by converting the Ultra320 or SE SCSI to HVD or vice versa. The presence of a SCSI Converter will not decrease data thru put.

Paralan SCSI Converters and SCSI Expanders are completely compatible with all devices that conform to the full ANSI X3T10 standard. They are available either as stand-alone units utilizing line voltage, or as board-level units for installation in other equipment.

Isolation for Hot Swapping

The isolation between the two sides of a MH32 allows a device on one side, for example, to be disconnected without disturbing the other side.
Ordering Guide
Model Numbers SCSI Product Description
Stand-alone

Board Version

   
MH32A
MH33A
 SCSI Wide Ultra320 to HVD Converter (16-bit)
  
2811
 5-1/4" Half Height Drive Bay Mounting Bracket & Faceplate for MH33A
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