Celestica A2210, User Manual, Page: 16 / 76

U S E R ’ S M A N U A L
1.4 External Connectivity
The majority of the external connections are through the I/O panel in the back of the
chassis. The connectors include the PS/2 keyboard and mouse connectors, the serial
port, the two USB ports, the SCSI connector, and the Ethernet ports. The following
sections explain these connectors.
1.4.1 PS/2 Keyboard and Mouse Connector
The PS/2 keyboard and mouse each use a right angle mini-DIN connector with
PC’99 standard coloring (violet for keyboard and light green for mouse).
Keyboard Connector
Once the keyboard data is identified as either system-specific or application-
specific, it is processed accordingly. When the operating system is notified that
there is data from the keyboard, the operating system checks to see if the keyboard
data is a system-level command. If the keyboard data is not a system-level
command, the operating system passes the data on to the current application. The
current application understands the keyboard data as an application-level command
and either accepts the data as content for the application or does not accept the data,
ignoring the information.
PS2 Mouse Connector
The data is sent serially on the data line from the mouse to the computer. The clock
line pulses to notify the system where each bit starts and stops. Eleven bits are sent
for each byte (one start bit, eight data bits, one parity bit, and one stop bit). The PS/2
mouse sends on the order of 1,200 bps, allowing it to report mouse position to the
computer at a maximum rate of about 40 reports per second.
1.4.2 Serial Port
There is a single 9-pin subminiature-D serial port (COM 1) on the front panel. This
port is designed to allow for wake-up commands from an external source such as a
modem.
1.4.3 USB Ports
A OHCI-based USB 1.1 controller exists within the AMD-8111 I/O hub. This
controller and its implementation on the main board meet the respective
specification design guidelines.
The following are features of the USB ports used on the A2210 server:
Single USB 1.1 port is mounted on the back panel I/O and routed to the
AMD-8111 I/O hub.
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Single USB 1.1 port is mounted on the front access panel board for front
access and routed to the AMD-8111 I/O Hub.
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