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Paralan's Series 80 Models MS16 / MS17 - Expand the
functionality of LVD/MSE and SE SCSI in several ways; 1) Allows
adding an SE device to an LVD bus without slowing down the LVD bus
segment, 2) Conversion from LVD to SE or vice versa, 3) Extending
the SE bus length, 4) Isolating an SE SCSI segment from an LVD SCSI
segment, 5) Join SCSI segments with no impact on SCSI protocol or
data throughput, 6) Adding a non-multimode LVD device to an SE SCSI
bus, and 7) Easily add a narrow (8-bit) SE device to a wide (16-bit)
LVD bus.
Maximizing Thru put with Mixed Devices
Multimode LVD SCSI will automatically change to Single-Ended (SE) if a
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 thru put levels. 
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.
Using MS16 Expanders in a back to back connection
This configuration works well to extend a single-ended bus segment. A
full cable length on the SE side, 25 meters (82 feet) cable in
between the two expanders and the full cable length on the host
adapter side to extend the total bus length. 
Paralan Expanders are completely compatible with all LVD,
LVD/MSE and SE 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 one side to be disconnected without disturbing devices on
the other side.
Narrow/Wide Conversion
The MS16 and MS17 models may be used to interconnect narrow SCSI
devices on one side for example, with wide SCSI on the other side.
This method assures proper termination on both bus segments.
High Voltage Differential (HVD) SCSI Extenders and Converters
Paralan also has Converters for converting between High Voltage
Differential (HVD) and LVD or single-ended SCSI devices. See Paralan
Series 80 MHxx models.
To extend an existing HVD bus, see the data sheet for Paralan's
SIR-D16 RegeneratoRâ„¢, or use a Paralan HVD Fiber Optic Extender for
very long distances.
For a printable version, please see the
PDF
of this data sheet.
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