when your SCSI bus is just a bit too short,
there is a simple, economical solution: a
SCSI HVD expander, the Paralan RegeneratoR™.
The RegeneratoR™ sends and receives SCSI
transmissions at maximum sustained HVD SCSI
data rate - up to 40 Mbytes/sec Ultra SCSI.
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
SCSI too short?
Example of extension for Single-ended (SE)
Note: Bus length for SE SCSI varies
depending upon the speed e.g. Fast, Ultra,
etc. therefore the example will not show
To obtain one extra SCSI length, simply
select the expander model appropriate for
your system, and plug in your cables. Daisy
chaining of three or more RegeneratoR™s is
also possible, depending on model. For a
full discussion on SCSI Extension see the
Extending SCSI page, and the article
The Case for SCSI Expanders.
Narrow/Wide SCSI incompatibility?
Wide SCSI (16-bit) may be placed on one side
and narrow SCSI (8-bit) on the other side.
SCSI communication will be accommodated and
all lines will be properly terminated.
SCSI devices need isolation?
Devices on one side of the RegeneratoR™ may
be disconnected and not affect devices on
the other side, as the signals on each side
The RegeneratoR™ is not just a repeater!
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. Paralan's exclusive
Auto Sense™, standard on all
RegeneratoR™ models, automatically detects
correct termination power, solving many
initial installation problems.
Paralan RegeneratoR™s are completely
compatible with all devices that conform to
the full ANSI X3T10 standards through SPI-3
(Ultra160). They are available either as
stand-alone units utilizing line voltage, or
as board-level units for installation in
For a printable version of this
information, please see the
PDF version of this data sheet.
RegeneratoR™ models are available for both
single-ended SCSI or differential (HVD) SCSI
systems; wide (16-bit) or narrow (8-bit):
Relative Humidity: 0 - 95%
Operating Temperature: 0 - 50°C
Voltage: 115/220 V ac, auto select;
Frequency: 50 - 60 Hz
Voltage: 5 V dc ±5%
UL, CSA, TUV, CE
FCC Class A, CE
SIR-D16C, -D17C: SCSI-3 68-pin
High-Density female "P" Connector
Parallel Transmission Rate:
Models SIR-D16C, -D17C:
up to 40 Mbytes/sec Ultra SCSI
Protocols: ANSI X3T10 SCSI standard
Physical Size (Stand-alone units)
2.5 in (64 mm)
4.1 in. (104 mm)
SIR-D16C: 7.5 in (190 mm)
Physical Size (Board-level units)
SIR-D17C: 3.880 x 6.750 in (98.5 x
For complete dimensions
see outline drawing.
5 COMPUTER: Global Value-Added Distribution
of NEW, used and refurbished computer
periphery by a family-owned and operated
company since 1979- distributing internationally
computer related peripherals on the new,
used and refurbished levels. HP,
and other major branded products as well
as a MAJOR focus on Mass Storage related
drives, media, storage
barcode labels, libraries, autoloaders,
NAS and software
our stock of NEW, used and refurbished storage
equipment changes daily, be sure to use
our online chat service to get "real
time" pricing from a knowledgeable sales
technician. We also offer the lowest priced
media on the net. Contact us now for
drive rental, repair, duplication, software
solutions or professional consultation.
*Buying refurbished can be better
than buying new because flaws have been found and
fixed, once it is deemed to be complete and in good
working order it is repackaged to be sold at a lower
price as refurbished.