2
Cabling Distance (Maximum):
SC120A-R2, SC122A-R2,
SW487A-R2: Single-Ended:
6 m (19.7 ft.); LVD: 25 m (82 ft.);
Serial: 15 m (49.2 ft.);
SC121A, SC123A, SW485A:
HVD: 25 m (82 ft.)
Data Format:
Serial: No parity,
8 bits, 1 stop bit (fixed)
Port Switching Delay (Maximum):
3 ns
Protocol:
All: Asynchronous and
synchronous compatible;
SC120A-R2, SC122A-R2,
SW487A-R2: TCP/IP
compatible
SCSI Bus Termination:
Single-Ended and LVD:
Active internal;
Differential: Passive internal
SCSI Compatibility:
SC120A-R2,
SC121A, SC122A-R2,
SC123A, SW485A, SW487A-R2:
SCSI-1, SCSI-2, SCSI-3;
SC120A-R2, SC122A-R2,
SW487A-R2: Also compatible
with Ultra160 SCSI (Ultra3
SCSI)
Signal Skew (Maximum):
2 ns
Speed (Maximum):
All: Serial: 9600 bps or 19.2 kbps;
SC120A-R2, SC121A, SC122A-R2,
SC123A: LAN: 10 Mbps;
SC120A-R2, SC122A-R2,
SW487A-R2:
Single-Ended:
8-bit Narrow: 20 MBps;
16-bit Wide: 40 MBps;
Differential:
8-bit Narrow: 40 MBps
for Ultra2 SCSI
(Narrow transfers
aren’t officially
supported in the
Ultra160 SCSI
standard);
16-bit Wide: 160 MBps;
SC121A, SC123A, SW485A:
8-bit Narrow: 40 MBps;
16-bit Wide: 80 MBps
Interface:
SC120A-R2, SC122A-R2,
SW487A-R2: Single-Ended
Narrow and Wide SCSI;
SC121A, SC123A, SW485A:
Differential Narrow and Wide
SCSI
Connectors:
SC121A: SCSI: (6) 68-pin HD F;
LAN: (1) RJ-45; Serial: (1) DB9 F;
SC123A: SCSI: (8) 68-pin HD F;
LAN: (1) RJ-45; Serial: (1) DB9 F;
SW485A: SCSI: (14) 68-pin HD F;
LAN: (1) RJ-45; Serial: (1) DB9 F;
SC120A-R2, SC122A-R2,
SW487A-R2:
SCSI: SC120A-R2:
(6) 68-pin HD F;
SC122A-R2:
(8) 68-pin HD F;
SW487A-R2:
(14) 68-pin HD F;
LAN: (1) RJ-45;
Serial: (1) DB9 M, (1) DB9 F
Operating Environment:
Temperature: 32 to 149°F
(0 to 65°C);
Humidity: Up to 90%
noncondensing
Power:
SC120A-R2, SC121A:
95 to 260 VAC, 48 to 65 Hz,
autosensing;
SC122A-R2, SC123A:
105 to 240 VAC, 48 to 65 Hz,
autosensing;
SW485A, SW487A-R2:
105 to 240 VAC, 50 to 60 Hz,
autosensing
Size:
SC120A-R2, SC121A, SC122A-R2,
SC123A: 4.5"H x 11.3"W x 9.7"D
(11.4 x 28.7 x 24.6 cm);
SW485A, SW487A-R2:
3.5"H x 16.8"W x 12"D
(8.9 x 42.7 x 30.5 cm)
Weight:
5 lb. (2.3 kg)
Specifications
The 2 x 2 Matrix Switches are
designed for desktop use only,
but the 4 x 2 Matrix Switches and
6 x 4 Electronic Switches come
with adhesive feet (if you want to
place them on a desk or another
flat surface)
and
rackmount hard-
ware (if you want to mount them
in a standard 19" equipment rack).
2 x 2 SCSI Matrix Switches
Two units are available.
Choose the model you need to
support Single-Ended Narrow and
Wide SCSI or Differential Narrow
and Wide SCSI.
Both units switch connections
between four independent SCSI
buses. Electronic switching is
transparent to SCSI controllers
and peripherals, and the switches
require no SCSI ID.
4 x 2 SCSI Matrix Switches
Two units are available that
support Single-Ended Narrow and
Wide SCSI or Differential Narrow
and Wide SCSI.
(continued from page 1)
By using a switch and its
electronic switching circuits, you
can electrically make or break
connections between groups of
four and two independent SCSI
buses.
As with the 2 x 2 switches, all
switching is transparent and no
SCSI ID is required for the units.
You can daisychain up to 60 4 x 2
SCSI Matrix Switches
(SC122A-R2, SC123A) and control
them all by one serial port.
6 x 4 Electronic SCSI Switches
Two units are available that
support either Differential Narrow
and Wide SCSI or Single-Ended
Narrow and Wide SCSI.
By using a switch and its
electronic switching circuits, you
can electrically make or break
connections between groups of
six and four independent SCSI
buses.
Up to 42 of these switches
can be daisychained together and
controlled via one serial port. All
switching is transparent and no
SCSI ID is required.
