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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:
-
Enclosed with an external power supply (to be added outside of the
server)
and
-
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)
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
RegeneratoR™ doubles the distance
to 3-12 m (10-40 feet)
Adding two SCSI
RegeneratoR™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)
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 RegeneratoR™
doubles the distance to 50 m (164 feet)
Adding two SCSI RegeneratoR™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)
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