Switch between Primary and Backup devices during system maintenance
Access a single device or group of devices from more than one host
Switch between two devices or groups of devices with the same SCSI
address
Access for more than the 15 SCSI devices normally available to a Wide
SCSI Port
Does not consume a SCSI address
Operation:
The SS1
SCSI Bus Switch allows two hosts to share peripherals or one host to access
either of two sets of peripherals. Each port may be SE, HVD or LVD. Switching
from one port to the other may be accomplished: a. locally with the front panel
switch, b. remotely with a momentary dry contact closure, or c. remotely via the
RS-232 port. A software template for
the RS-232 port is included in the User Manual. In all cases switching does
not occur until "bus free."
In mode
One, Port 1 is connected to the Common Port. In mode Two, Port 2 is connected to
the Common Port. A front panel LED displays the selected port. Each port
supports a full SCSI cable length and provides term power and termination, which
may be disabled. The SS1 does not consume a SCSI device ID, is transparent to
both initiator and target, and does not slow data throughput. Devices on the LVD
ports run at SCSI throughput up to 160 Mbytes/sec, HVD and SE ports run at up to
40 Mbytes/sec. An amber LED for each port indicates bus activity and a green LED
indicates that each port is powered. See Rear View Photo.
For a printer friendly version of this information, please see the PDF
version of this data sheet.
A front
panel 7-segment LED display shows the active port.
Specifications:
SCSI
Interface:
Order
LVD/MSE, HVD or SE for each port
LVD supports Ultra 160
HVD or SE supports Ultra
Cable
Length & Data Throughput:
LVD
- up to 160 Mbytes/sec
25 m (82 ft) point-to-point
12 m (40 ft) with more than 2 IDs
SE
- up to 40 Mbytes/sec
6 m (20 ft) SLOW SCSI
3 m (10 ft) FAST SCSI
1.5 m (5 ft) Ultra SCSI
HVD
- up to 40 Mbytes/sec
25 m (82 ft)
Serial
Interface:
Mode:
8 bits, 1 stop bit, no parity
Baud
Rate: 9600 baud
Max
Cable Length: 50 feet
Environmental:
The
Paralan SCSI Switch is designed to operate in an office
environment with limited capacity for heating and air
conditioning.
Temperature
Range:
Operating:
0 to +50 C
Storage: -25 to +75C
Humidity
Range:
Operating:
5 to 90% RH
Storage: 5 to 95% non-condensing
Construction:
All
Metal
Connectors:
Wide
SCSI: 68-pin High-Density, female Alt 3, P Connector
Narrow SCSI: 50-pin Centronics type, female Alt 2, A
connector
Power:
Maximum
Power Requirements: 40 Watts
Line
Voltage: 90 to 264 VAC,
47 to 63 Hz Auto-Ranging
Single-ended Narrow (50-pin centronics type connector)
N*
N*
N*
|
|
Tabletop Enclosure with Rubber Feet
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T
Adapters for Rack Mounting the Switch -
1 Pair
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R
*N
version available only as SS1-NNN-T or R
Custom
switch inquiries for OEM quantities are welcome.
Example
1: Model No. SS1-LHL-T - Tabletop Model SS1 with LVD/MSE
at both switched ports and HVD at the Common port
Example
2: Model No. SS1-SLH-R - Rack Mount Model SS1 with LVD/MSE
at the Common port, SE Wide at Port 1 and HVD at Port 2
Notes:
The
SS1 comes assembled and wired with the selected Ports
installed.
A
six foot (1.84 m) North American grounded cordset (NEMA
5-15, rated 250 VAC) is included in shipments to
destinations in North America and Japan. Other destinations
receive no cordset.
Paralan SCSI 
Switch between Primary and Backup devices during system maintenance
