2-11
About the DuraStor Storage Subsystem
Additionally, four 68-pin very-high-density SCSI connectors
connect the disk channels of the DuraStor 312R storage enclosure.
They are:
■
DISK CH 3
■
DISK CH 0
■
DISK CH 2
■
DISK CH 1
See
Appendix A,
Port Information
connector pin-out details.
Two RS-232 serial ports each connect a controller to a VT-100
terminal, and are used when you want to access Disk Array
Administrator. Serial A port is for Controller 1; Serial B port is for
Controller 2.
The switch in the lower right corner of the panel sets the
keyboard/keypad input control to either
INT
(internal, via the
OCP) or
EXT
(external, via the VT-100 keyboard or a computer
running Hyper Terminal). Setting the switch to
EXT
disables the
OCP buttons.
Note:
The front bezel LEDs will work whether the OCP is
being used or not. Setting this switch to
EXT
will not disable
the front bezel LEDs.
Optical SFP Transceiver
The Fibre Channel-to-SCSI RAID appliance uses a hot-swappable
Small Form Factor Pluggable (SFP) transceiver. The SFP optical
transceiver provides operations up to 2.5 Gb/sec. The transceiver
includes a lost signal detect circuit which provides TTL logic high
output when an unusable input signal is detected.
Figure 2-11. Optical Transceiver
DuraStor IUG.book Page 11 Wednesday, January 30, 2002 10:49 AM
