SCSI Converters and Extenders

 
 

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SCSI Converters and Extenders  


SE-HVD SCSI converters and extenders enable you to interconnect single-ended and differential interface.
 
SCSI Converters and Extenders

 
All Paralan SCSI Converters conform to the full SCSI ANSI standard. This includes managing the arbitration and disconnect/reconnect features of the latest systems, down to the SASI communications of earlier systems. They manage any possible signal conflicts such that they remain transparent to both differential and single-ended devices!
Convert between Single-ended SCSI and Differential SCSI devices!Convert between Single-ended SCSI and HVD SCSI devices
Both 8-bit and 16-bit ModelsBoth 8-bit and 16-bit Models
Extend SCSI Bus LengthExtend SCSI Bus Length

 

The first implementation of SCSI was single-ended. Differential (HVD) SCSI was developed for improved noise immunity, increased drive stability and the longer attainable cable lengths.

Paralan SCSI converters make communication between both types of devices possible. Hardware and software remain the same: the converter is transparent to all devices. Plug your single-ended cable into one end of the converter and the differential (HVD) cable into the other end. All SCSI devices will be available.

All Paralan SCSI Converters conform to the full SCSI ANSI standard. This includes managing the arbitration and disconnect/reconnect features of the latest systems, down to the SASI communications of earlier systems. They manage any possible signal conflicts such that they remain transparent to both HVD and single-ended devices.

SCSI converter/extender models are available for both wide (16-bit) or narrow (8-bit); and in stand-alone or board-level versions.

Paralan introduced the industry's first Fast (10 Mbyte/sec) single/differential (HVD) SCSI converter in 1992. These new models, using our own ASIC, are Ultra SCSI compatible: 20 Mbyte/sec for 8-bit (narrow) and 40 Mbyte/sec for 16-bit (wide) SCSI.

Narrow and wide devices may be placed in the same system. Call Paralan for details.

Extend Total Cable Length

By using two converters in series an extension up to 200 feet (60 m) is obtainable. See "Operation as a SCSI Extender," below, and the transmission length table on the SCSI extension page.

Handle Bus Noise, Termination Problems

Auto Sense™ detects correct termination power. All models have internal terminations which may be disabled if the converter is not placed at the end of the bus.

 

Operation as a Single-ended/HVD SCSI Converter

Since SCSI is a bidirectional bus, a single converter is used to interconnect single-ended SCSI IDs with HVD SCSI IDs. Place the converter within 19 feet (6 m), or 10 feet (3 m) for fast SCSI, or 5 feet (1.5 m) for Ultra SCSI, of the single-ended SCSI port. Up to 82 feet (25 m) of cable may be placed between the converter and HVD port, or 87 to 100 feet (26.5-31 m) overall. Paralan is the first to produce SCSI converters that enable the maximum SCSI cable length on both ends, even through Ultra speeds. For a printable version of this information, please see the PDF version of this data sheet.

SCSI Extension

Single ended: Two Paralan converters can extend the single-ended SCSI bus up to 200 feet (60 m). Place each converter within 19 feet (6 m), or 10 feet (3 m) for fast SCSI, or 5 feet (1.5 m) for Ultra SCSI, of the two single-ended SCSI ports. Then connect up to 160 feet (50 m) of differential SCSI cable between them.

Differential (HVD): Two Paralan converters can extend the HVD SCSI bus up to 174 feet (53 m). Connect up to 82 feet (25 m) of differential SCSI cable to each converter. Then connect up to 10 feet (3 m) of single-ended cable between them. For HVD SCSI extension, the SCSI RegeneratoR™s (SIR-Dx series) are usually a better choice for distances up to 320 feet (100 m).

Examples:
 

conversion examples

 
conversion examples

 
Extend the Distance


 
Ordering Guide:

 

SCSI Converter/Extenders Stand-alone Board-level
Narrow (8-bit) SCSI SD10D SD11D
Wide (16-bit) SCSI Use MH16A Use MH17A

 
Specifications
SD10D/SD11D SD16B/SD17C
Environmental
Relative Humidity: 0-95% non-condensing
Operating Temperature: 0-50°C

Power Requirements
SD10D, SD16B: 115/220 V ac, auto select, 50-60 Hz, 10 Watts
SD11D: +5 V dc ±5% @ 1 A max.
SD17C: +5 V dc ±5% @ 1.5 A max.

EMI/RFI
Meets FCC Class A, CE

Communication
Parallel Transmission Rate (sustained):
SD10D, SD11D: up to 20 Mbytes/sec Ultra SCSI
SD16B, SD17C: up to 40 Mbytes/sec Ultra SCSI
Protocols: ANSI X3T10 SCSI standard

Safety Approvals
UL, CSA, TUV/VDE, CE

Weight: SD10D, approx. 1.5 lb. (0.7 kg);
shipping weight 4 lb. (1.8 kg)
SD11D: SCSI Alt. 1 (0.1" pitch header)
SD16B: approx. 2 lb. (1 kg);
shipping weight 4 lb.

Warranty
Two year limited warranty

SCSI Connections
SD10D: SCSI-2 (Alt. 2-A cable, Centronics type)
SD11D: SCSI Alt. 1 (0.1" pitch header)
SD16B, SD17C: SCSI-3 68-pin High-Density female "P" Connector

Dimensions
SD10D: 4.1"W x 6.9"D x 1.6"H (104 x 175 x 41 mm)
SD16B: 4.1"W x 7.5"D x 2.5"H (104 x 190 x 64 mm)
SD11D, SD17C (board dimensions):
5.750" W x 3.880"H (146.0 x 98.5 mm).

For complete dimensions see outline drawing.

 

Dim for SD10D/SD11D SD16B/SD17C
 
9 TO 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, Compaq, IBM, CISCO, 3COM, APPLE, SEAGATE, and other major branded products as well as a MAJOR focus on Mass Storage related drives, media, storage racks, tri-optic barcode labels, libraries, autoloaders, duplicators, jukeboxes, HBA's, JBOD, Raid, SAN, NAS and software solutions.

As 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 storage 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.

© Copyright 2003.
*Price and availabilities subject to change without any notice. Not responsible for typographical errors.


Paralan SCSI products, SCSI Converters and Extenders