IBM 866011U - Netfinity 5500 - 8660, Hardware Maintenance Manual

Page: 174 / 402

Input/Output ports and connectors:
The
input/output (I/O) connectors are for attaching external
devices, such as printers, keyboards, and displays, to the
server. The I/O connectors on the server include:
Ÿ
Two serial-port connectors
Ÿ
One systems management connector
Ÿ
One parallel-port connector
Ÿ
One video-port connector
Ÿ
One keyboard-port connector
Ÿ
One auxiliary-device-port connector
Ÿ
One Ethernet-port connector
Ÿ
Two USB-port connectors
See the illustration in “Input/Output connectors and
expansion slots” on page 194 for the locations of the
connectors.
Serial ports:
The server comes with two serial ports.
(See “Input/Output connectors and expansion slots” on
page 194 for the locations of the connectors.) These ports
are used to communicate with printers, plotters, external
modems, scanners, and auxiliary terminals. These ports
also enable you to transfer data between computers.
Serial ports can transfer data asynchronously, which
means that they can transmit any number of characters at
any time, with no restriction on the duration of the pauses
between characters.
The serial ports can transmit and receive data and
commands at rates of from 300 bits per second up to
115 000 bits per second.
Serial port A is shared by the operating system and the
integrated system management processor. Serial port B
can be used by only by the operating system.
Each serial port has a 9-pin, male D-shell connector on the
back of the server. The pin-number assignments of this
connector conform to the industry standard.
1 5
6 9
The following table shows the pin-number assignments for
the serial-port connectors.
Table 2. Serial Port Pin-Number Assignments
Pin Signal Pin Signal
1 Data carrier detect 6 Data set ready
2 Receive data 7 Request to send
3 Transmit data 8 Clear to send
4 Data terminal ready 9 Ring indicator
5 Signal ground
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Netfinity Server HMM