Qualstar XLS Series Technical & Service Manual page 33

System controller components include the following:
• CAN bus controller card. A two-channel control area network (CAN) adapter
card is plugged into the motherboard to allow the system controller to
communicate with the distributed control boards (DCBs) in the library. For a
detailed diagram showing how CAN bus communication is routed throughout the
XLS, refer to
• Host bus adapter cards. The system controller includes expansion slots for up
to four host bus adapter cards (HBAs). Each HBA has two ports, allowing the
medium changer interface in the XLS to be concurrently connected to up to eight
independent host computers. The XLS supports SCSI and Fibre Channel HBAs.
Important:
• Ethernet connectors. The system controller includes two Ethernet connectors
for communication across 10/100 Base-T Ethernet networks. One of the Ethernet
connectors allows the XLS to be connected to a customer network for remote
managing and monitoring of XLS functions; the other Ethernet connector (service
port) allows the XLS to be connected directly to a laptop or other standalone
computer for local configuration and service operations.
• Hard drive.
• 24VDC PC power supply. The PC power supply provides power to the system
controller, the touch screen LCD display on the front of the library, and the
power supply controller.
• Cooling fans. Two cooling fans at the back of the system controller draw air in
through the air filter cover and air filters on the front of the LRM and ventilate it
out through the back. (Individual fans are also included in each tape drive
assembly and power supply module.) The cooling fans and air filters are easily
changed without interrupting XLS operations.
XLS Library Technical Service Manual
Section 3.2 on page 3-4.
The HBAs in the system controller manage the XLS's
medium changer interface only; they do not control or
communicate with the tape drives or move data.
2
About the XLS
2-
19