The maximum SCSI cable lengths are limited to 25 m (82 ft.) for HVD SCSI and 6 m (20 ft.) or less for SE SCSI. Often SCSI communications may be needed over greater distances.
This distance may be increased using a Paralan RegeneratoR™, which also isolates the two SCSI bus segments connected to it allowing hot-swapping of SCSI devices.
- Get double, triple, or even greater bus length
- Put Narrow and Wide devices on the same bus
- Isolation - Change or remove devices from the SCSI bus without affecting other devices
No need to modify software or hardware! Just connect your SCSI cables to a RegeneratoR™ and all devices on the bus will be available at an extra bus length. It's as easy as that!
An example showing daisy chaining is shown below. For a full discussion on SCSI Extension see the Extending SCSI page, and the article The Case for SCSI Expanders.
Cable causes timing delays of approximately 1.5 ns per foot of length. When SCSI-specified cable length is exceeded, this cable-caused delay would normally cause a system to malfunction. Logic circuitry in the RegeneratoR™ manages this delay such that disconnect, reconnect, arbitration and all other SCSI features are not affected. The SCSI signals are regenerated, reshaped, and retransmitted, all transparent to the system.