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These boxes / boards are used to extend the length of a SCSI bus. This
extension happens without affecting the speed of the existing SCSI bus.
Most come in (2) form factors:
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- Enclosed with an external power supply (to be added outside of the
server)
- Internal board only (Uses computer power supply and optional 5
1/4" drive bay adapter. Connects internally to the server and
externally to the device.
One or two extenders may be necessary to obtain the length desired,
Don't forget to tell us the length and connector styles needed for
the cables to make the connections!
Quick Jump Menu:
Single-ended (SE) -
Low Voltage Differential (LVD) - High
Voltage Differential (HVD)
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Single-ended SCSI Transmission Limits
Unassisted Single-ended SCSI: 6 m (19 feet); 3 m (10 feet) for fast
SCSI; 1.5 m (5 feet) for Ultra SCSI Adding a SCSI RegeneratoRâ„¢ doubles
the distance to 3-12 m (10-40 feet)
Adding two SCSI RegeneratoRâ„¢s
more than quadruples the distance to 15-25 m (50-80 feet)
Two
Paralan Differential (HVD) SCSI Converters used as extenders: 60 m (200
feet)
Quick Jump Menu:
Single-ended (SE) -
Low Voltage Differential (LVD) - High
Voltage Differential (HVD)
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Low-voltage Differential (LVD) SCSI
Transmission Limits
Unassisted LVD SCSI: 12m (40 feet), or 25m (82 feet) point-to-point.
- Note: all devices on segment must be LVD, otherwise use
Single-ended limits.
Adding one LVD/MSE Expander doubles
the distance to 24 m (80 feet) or 50 m (164 feet)
Adding two LVD/MSE to HVD Converters
used as extenders: 74m (240 ft)
Quick Jump Menu:
Single-ended (SE) -
Low Voltage Differential (LVD) - High
Voltage Differential (HVD)
-
High-voltage Differential (HVD) SCSI
Transmission Limits
Unassisted differential SCSI: 25 m (82 feet)
Adding one SCSI
RegeneratoRâ„¢ doubles the distance to 50 m (164 feet)
Adding two SCSI
RegeneratoRâ„¢s quadruples the distance to 100 m (328 feet)
Using Differential SCSI Converters: 750m (2500 feet)
Quick Jump Menu:
Single-ended (SE) -
Low Voltage Differential (LVD) - High
Voltage Differential (HVD)