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.
By using two converters in series an extension up to 140 feet
(45 m) is obtainable. See "Operation as a SCSI Extender," below, and
the transmission length table
on the SCSI extension page.
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.
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.
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 120 feet (37 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 280 feet (85 m).
PDF version of this data sheet.
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SCSI
Converter/Extenders
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Stand-alone
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Board-level</STRONG<
th>
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Narrow (8-bit) SCSI
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SD10D
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SD11D
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Wide (16-bit) SCSI
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Use MH16A
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Use MH17A
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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
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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).
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PDF version of this data sheet.
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Model Numbers
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Description
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Stand-alone Unit
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Board-level Version
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MS16A
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MS17A
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SCSI Wide LVD/MSE to SE Expander (16-bit)
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EB1
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Rack Mount Expander
Box (rack mount up to 3 SCSI Expanders)
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2811
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5-1/4" Half
Height Drive
Bay Mounting Bracket
& Faceplate for MS17
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SQxx
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SCSI Quiet Cable™
(specify length)
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Environmental
Relative Humidity:0 - 95% non-condensing
Operating Temperature:0 - 50°C
Storage Temperature:–25 - +75°C
Weight:
MS16A: approx. 12 oz (0.9 kg)
Shipping weight, approx. 2 lb (1.8 kg)
MS17A: 2.5 oz (71 g)
Shipping weight, approx. 2 lb (1 kg)
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Safety Approvals
UL, CSA, TUV, CE
EMI/RFI
FCC Class A, CE
SCSI Connections
MS16A, MS17A: SCSI-3 68-pin High-Density female Alt-3 “P” Connector
Communication
Sustained Data Throughput:
Limited by SE bus to 40 Mbytes/sec (16-bit)
Warranty
Two year limited warranty
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Power Requirements
Stand-alone units (MS16A):
Voltage:100 - 250 VAC,
auto select
Frequency:50 - 60 Hz
Board-level
units (MS17A):
Voltage:5 V dc ±5%
Current:0.8 Amps
An additional 1 Amp Max if
used to power
external terminators
Physical Size: (MS16A)
Height: 1.6 in. (41 mm)
Width: 4.1 in. (104 mm)
Depth: 4.5 in. (114 mm)
(MS17A)
Height: 0.4 in. (10.2 mm)
Width: 3.880 in. (98.5 mm)
Depth: 4.5 in. (114 mm)
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<SMALLFor the MS17A Dimensioned Parts Location Drawing
download the PDF.
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Maintenance
