SD10 / SD11
SD16 / SD17 (Replaced By MH-16 & MH-17)
Single-Ended SCSI to Differential SCSI Converter/Extenders
Convert between
Single-ended SCSI and Differential SCSI devices
New ASIC Versions
Both 8-bit
and 16-bit Models
Extend SCSI
Bus Length
NEW! Custom
Modifications to Your Specs
Many systems
use single-ended SCSI because of the lower cost and large base of available
devices. An increasing number of systems and devices use differential (HVD)
SCSI because of the 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.
New ASIC Version
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 Sierra 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.
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 bi-directional 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.
Operation as a SCSI Extender
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). To
4 km (13,000 feet): If longer distances are required, refer to Paralan
Fiber Optic SCSI Extenders (QA and FX series).
Available Models
SCSI converter/extender
models are available for both wide (16-bit) or narrow (8-bit); and in stand-alone
or board-level versions:
Stand-alone
Board-level
Narrow (8-bit) Single-ended SCSI
SD10
SD11
Wide (16-bit) HVD SCSI
MH16
MH17
Note: SD-16s are still available for replacement purposes.
DUAL option: For convenience in daisy chaining,
it may be useful to order Option DUAL (SD16 only), which provides two
connectors on each end of the SCSI converter.
Specifications
- SCSI Converter/Extender
Environmental
Relative
Humidity: 0-95% non-condensing
Operating
Temperature: 0-50°C
SD11:
+5 V dc ±5% @ 1 A max.
SD17:
+5 V dc ±5% @ 1.5 A max.
Safety
Approvals
UL,
CSA, TUV/VDE, CE
EMI/RFI
Meets
FCC Class A, CE
Physical
Size
SD10:
4.1"W x 6.9"D x 1.6"H (104 x 175 x 41 mm)
SD16:
4.1"W x 7.5"D x 2.5"H (104 x 190 x 64 mm)
SD11, SD17 (board dimensions): 5.750" W x 3.880"H (146,0 x 98,5 mm).
For complete dimensions Click
for Mechanical Drawing.
Paralan
SCSI 