Medium Optical Disk (RW551/RW552) Library
3–4
EK–MOL80–SV. B01
If a power failure occurs during a write operation, the UPS must be able to
continue to supply power to the jukebox/computer system until the data in the
optical drive's buffer can be written to an optical disk.
For the best protection, the customer should choose the type of UPS that provides
a communication link between the UPS and the computer system. With this type
of connection, the computer system is informed when power is being supplied by
the UPS and can issue commands to automatically write any data from buffers to
disk. The computer then refuses any additional write commands until regular
power is restored.
CAUTION
If the UPS does not provide a communication link
between the UPS and the computer system, an
operator will have to shut down the computer
system (stop any new writes) before the UPS
battery power is drained.
If the UPS is connected to the jukebox, the following power requirements must
be met:
Table 3–1 UPS Power Requirements
Volt-Amp
Watts
125 Volt-Amps (typical)
75 Watts (typical)
180 Volt-Amps (max.)
110 Watts (max.)
Connecting the SCSI Cable to the Jukebox
The jukebox connects to the host computer with a high-density SCSI interface
cable, and may be configured to use either a single-ended or a differential SCSI
interface. The SCSI interface type is selected using the SCSI interface switch on
the left side panel of the jukebox (see Figure 3–2). The total allowable length of
the SCSI cable depends on which interface type is selected. Refer to Table 3–2
for allowable SCSI cable lengths.
