IBM 8500R - Netfinity - 8681, Hardware Maintenance Manual

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Input/Output port connectors:
The input/output
(I/O) port connectors are for attaching external devices,
such as printers, keyboards, and displays, to the server.
The I/O port connectors on the server include:
Ÿ
Two serial-port connectors
Ÿ
One parallel-port connector
Ÿ
One video-port connector
Ÿ
One keyboard-port connector
Ÿ
One auxiliary-device-port connector
Ÿ
One external Wide Ultra-2 SCSI (LVD) port connector
Ÿ
Two USB-port connectors
Ÿ
One 10/100 Mbps Ethernet port connector on the
Advanced System Management PCI Adapter
Ÿ
One dual serial-port connector on the Advanced
System Management PCI Adapter
Ÿ
One Advanced System Management Interconnect
port connector
Refer to the illustration in “Input/output connectors and
expansion slots” on page 122 for the locations of the
connectors.
Serial port:
The server comes with two serial ports.
(Refer to “Input/output connectors and expansion slots” on
page 122 for the locations of the connectors.) These ports
are used to communicate with printers, plotters, external
modems, scanners, and auxiliary terminals. You can also
use these ports to transfer data between computers.
Serial ports transfer data one bit at a time, using direct
memory access (DMA). DMA is a method of transferring
data between I/O devices and system memory without
intervention by the system processor.
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
345 600 bits per second. To use a serial port at 345 600
bits per second, you need a shielded serial cable. For
information about this cable, contact your IBM marketing
representative or your IBM authorized reseller.
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
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