Models SIR-xx
SCSI Too Short? Get double, triple, or even greater bus length.
Narrow/Wide SCSI Incompatibility? Put narrow and wide devices on the same bus.
SCSI Devices Need Isolation? Change or remove components from the SCSI bus without affecting others.
For a printable version, please see the PDF of this data sheet.

Now when your SCSI bus is just a bit too short, there is a simple, economical solution: Paralan's SCSI Isolating RegeneratoR™. A Paralan RegeneratoR™ sends and receives SCSI transmissions at maximum sustained 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 that!

SCSI too short?

To obtain one extra SCSI length, simply select the RegeneratoR™ 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 are isolated.

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 standard. They are available either as stand-alone units utilizing wall power, or as board-level units for installation in other equipment. For a printable version of this information, please see the PDF version of this data sheet.

Ordering Guide

RegeneratoR™ models are available for both single-ended SCSI or differential (HVD) SCSI systems; wide (16-bit) or narrow (8-bit):

	Stand-alone Unit		Board-level Unit
	Single-ended SCSI	HVD SCSI	Single-ended SCSI	HVD SCSI
Narrow (8-bit)	Use MS-8	Use SIR-D16B	Use MS-9	Use SIR-D17B
Wide (16-bit)	Use MS16	SIR-D16B	Use MS17	SIR-D17B

Specifications SCSI Isolating RegeneratoR™

Environmental Relative Humidity: 0 - 95% non-condensing Operating Temperature: 0 - 50°C Power Requirements Stand-alone units: Voltage: 115/220 V ac, auto select; Frequency: 50 - 60 Hz Board-level units: Voltage: 5 V dc ±5% Safety Approvals UL, CSA, TUV, CE EMI/RFI FCC Class A, CE SCSI Connections SIR-S8A, -S9A: SCSI-2 (Alt. 2 - A Cable) SIR-D16B, -D17B: SCSI-3 68-pin High-Density female "P" Connector

Communication Parallel Transmission Rate: Models SIR-D16B, -D17B: up to 40 Mbytes/sec Ultra SCSI Models SIR-S8A, -S9A: up to 20 Mbytes/sec Ultra SCSI Protocols: ANSI X3T10 SCSI standard Physical Size (Stand-alone units) Height: SIR-S8A: 1.6 in. (41 mm) All others: 2.5 in (64 mm) Width: 4.1 in. (104 mm) Depth: SIR-D16B: 7.5 in (190 mm) SIR-S8A: 4.5 in (114 mm) Physical Size (Board-level units) SIR-S9A: 3.880 x 4.000 in (98,5 x 101,6 mm). For complete dimensions see outline drawing. SIR-D17B: 3.880 x 6.750 in (98,5 x 171,4 mm). For complete dimensions see outline drawing.