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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
RegeneratoR™, 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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Paralan
SCSI
