SCSI Multimode Expander Extends the SCSI Bus Length of an LVD/MSE System

 
 

"A Global Value-Added Distributor of new, used and refurbished computer periphery by a family-owned and operated company since 1979"
 Site Map
Search 9 TO 5 for computer parts:


Add this to your site

Product Categories

Battery BackUPS
CD/DVD Duplicators

FibreChannel/HBA's
Hard Drives
Hard Drive Duplicators
HP
IBM
Iomega
Laptops
Networking Solutions
Media
Optical Drives
Processor/Video Upgrades
Printers
SCSI Adaptors

Tape Drives
UMAX Scanners
USB/FIREWIRE Solutions

c2it makes it easy to send and receive money online with your friends and family. Click here to see how:



PayPal lets any business or consumer with an email address to securely, conveniently, and cost-effectively send and receive payments online.

Sign up for PayPal and start accepting credit card payments instantly.
SCSI Multimode Expander   


SCSI Multimode Expander Extends the SCSI Bus Length of an LVD/MSE System
   
Getting the Most from LVD/MSE SCSI Paralan Model MM16/17 SCSI Multimode Expander
Convert Between LVD and Single-endedExtend Bus Length
Extend Bus LengthUp to 160 MByte/sec sustained throughput
Isolate Segments of a SCSI busConvert Between LVD and Single-ended
Isolate Segments of a SCSI bus

 
The board-level version Model MM17 is sized to fit in a standard 3.5 drive bay

The board-level version Model MM17 is sized to fit in a standard 3.5" drive bay.

Targets and initiators may be located on both the A and B sides of the ExpanderTargets and initiators may be located on both the A and B sides of the Expander

Backward compatible with older versions of SCSIBackward compatible with older versions of SCSI

Does not consume a SCSI IDDoes not consume a SCSI ID

 

 

Specifications
MM16/17 SCSI Multimode Expander
Environmental
Relative Humidity: 0 - 95% non-condensing
Operating Temperature: 0 - 50°C
Storage Temperature: –25 to +75°C
Power Requirements
Stand-alone units (MM16):
Voltage: 115/220 V ac, auto select
Frequency: 50 - 60 Hz
Board-level units (MM17):
Voltage: 5 V dc ±5%
Current: 1.5 A max
Safety Approvals
UL, CSA, TUV, CE
EMI/RFI
FCC Class A, CE
SCSI Connections
MM16, MM17: SCSI-3 68-pin High-Density female Alt-3 “P” Connector
Communication
Sustained Data Throughput:
Up to 160 MBytes/sec (16-bit)
Warranty
Two year limited warranty
Weight:
MM16: approx. 2 lb (0.9 kg)
Shipping weight, approx. 4 lb (1.8 kg)
MM17: 2.5 oz (71 g)
Shipping weight, approx. 2 lb (1 kg)
Physical Size (MM16)
Height: 1.6 in. (41 mm)
Width: 4.1 in. (104 mm)
Depth: 4.5 in. (114 mm)
Board-Level Version Dimensions:
Overall board dimensions 4.00 x 3.88 in. (101.6x98.5 mm)
See PDF drawing for details.
 
 


 
SCSI Expander Model MM16
Quick Reference: Operation Specs Ordering Info
OEM's Custom Modifications to YOUR Specifications!

Expand the functionality of LVD/MSE SCSI in several ways: 1) conversion from LVD to SE or vice versa, 2) extending the SE or LVD SCSI bus length, 3) isolating one SCSI segment from another SCSI segment, and 4) join SCSI segments. All this is accomplished without any impact on SCSI protocol or data thruput by using Paralan’s Models MM16 / MM17. For a printable version, please see the PDF of this data sheet.

Extending the Bus Length

There are several ways to utilize Expanders to extend the SCSI bus length well past standard SCSI limits. Some examples:

Using a single Multimode Expander – The effective bus length can be doubled by the addition of a single Multimode Expander. With all LVD devices, the standard 12m (40 ft) bus length can be extended to 24m (80 feet).
 

The effective bus length can be doubled by the addition of a single Multimode Expander. With all LVD devices, the standard 12m (40 ft) bus length can be extended to 24m (80 feet)
Maximizing Thruput with Mixed Devices

Multimode LVD SCSI will automatically change to Single-Ended (SE) if an SE device is on the bus segment. When both LVD and SE devices share the same bus segment, the entire SCSI bus segment will operate at the lower performance level of single-ended SCSI, including reduced bus length. However, by grouping LVD and SE devices, and isolating them with a Multimode Expander, the LVD devices can be operated at their full designed thruput levels.

Multimode LVD SCSI will automatically change to Single-Ended (SE) if an SE device is on the bus segment. When both LVD and SE devices share the same bus segment, the entire SCSI bus segment will operate at the lower performance level of single-ended SCSI, including reduced bus length. However, by grouping LVD and SE devices, and isolating them with a Multimode Expander, the LVD devices can be operated at their full designed thruput levels
Using Two Multimode Expanders in a Back-to-Back Connection

Contact Paralan Technical Support for information.

When Used to Extend the SCSI Bus

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 Expander 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 Expanders 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.

Isolation for Hot Swapping

The logical isolation between the two sides of an Expander allows a device on side B, for example, to be disconnected without disturbing side A.

Narrow/Wide Conversion

The MM16 and MM17 (wide) models may be used to interconnect narrow SCSI devices on side B, for example with wide SCSI on side A.

High Voltage Differential (HVD) SCSI Extenders and Converters

Paralan also has Converters (Paralan MHxx models) for converting between High Voltage Differential (HVD) and LVD or single-ended SCSI devices. Converters may also be used to provide extension of an LVD or single-ended bus up to 50m (160 feet).
To extend an existing HVD bus, see the data sheet for Paralan’s SIR-D16 RegeneratoR™.

 

Ordering Guide
Model Numbers SCSI Product Description
Stand-alone Board Version   
MM16 MM17 SCSI Wide LVD/MSE to LVD/MSE Expander (16-bit)
EB1
Rack Mount Expander Box (rack mount up to 3 SCSI Expanders)
2811
5-1/4" Half Height Drive Bay Mounting Bracket & Faceplate for MM17
SQxx
SCSI Quiet Cable™   (specify length)

 

 

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 Multimode Expander Extends the SCSI Bus Length of an LVD/MSE System