Types of Cables
Types of Cables
The server uses cables to connect
IDE and SCSI drives to the power supply, riser card, and system board.
The diskette drive is also powered through a cable attached to the riser card.
Each cable connector is designed to fit a corresponding drive connector.
The following cables are provided:
- Four-wire power cables connect most drives to the power supply.
At the ends of these cables are plastic connectors that attach to different drives, these
connectors vary in size.
Also, some power cables attach to the riser card.
- Flat signal cables , sometimes called ribbon cables ,
connect IDE drives to the riser card.
There are two sizes of signal cables that come with the server.
- The wider signal cable attaches to the primary
IDE connector on the back of the riser card.
- The narrower signal cable attaches to the
diskette drive and to the diskette drive connector
on the back of the riser card.
- A flat SCSI signal cable for connecting devices to the
Since the server is equipped with an UltraSCSI adapter, it
has a ribbon cable that is connected to the internal
hard disk drive.
One end of this cable is connected to the
68-pin, internal SCSI connector on the SCSI adapter.
The other end of the SCSI cable has a terminator. This cable
provides four connectors for attaching other internal SCSI devices.
To locate connectors on the system board, see
System Board Illustration
The diskette, IDE CD-ROM, and other IDE device
connectors are on the back of the riser card.
When you are installing optional drives, refer to the following
illustration for the location of the appropriate connectors.
The following illustration is for reference only.
Before you install drives, be sure to check the orientation of
the server riser card for the correct connector locations.
The bottom edge of this card is located at the back of the server.
- Alert on LAN and AssetID are available on some
- If you attach a 4-position cable connector to the
2-pin Modem Wakeup connector, ensure that the
unused positions are next to the bottom of the
riser card , as shown in the illustration. If this
cable is incorrectly attached, the server might
automatically restart each time that you turn off the power.
The following are some important points to remember
when connecting power and signal cables to internal drives:
- The diskette drive, hard disk drive (if applicable), and
CD-ROM drive that are preinstalled in the server
come with power and signal cables attached.
The CD-ROM drive is attached to the primary IDE
connector on the back of the riser card. If you
replace any drives, it is important to remember which
cable is attached to which drive.
- When you install a drive, ensure that the connector at
the end of the signal cable is connected to the system board.
- The CD-ROM drive and the diskette drive are the only
IDE devices that come with the server.
You can install another IDE device, such as a CD-ROM drive
or tape drive, however,
IDE hard disk drives are not supported.
- If two or more IDE devices are used on a single
cable, one must be designated as the primary or
master device and all others as secondary or
subordinate devices, otherwise, some of the IDE
devices might not be recognized by the system.
The primary or secondary designation is determined by
switch or jumper settings on each IDE device.
In this server, the IDE CD-ROM drive is the primary device.
If you install a second IDE device, it must be the secondary device.
- You can install one diskette drive only.
- If you plan to attach an internal SCSI drive, connect it
to one of the available connectors on the internal SCSI cable.
The SCSI cable provides termination.
If you plan to attach an external SCSI drive, see
for additional information.
For help in selecting drives, cables, and other options for
the server, do one of the following:
- Within the United States, call 1-800-IBM-2YOU
(1-800-426-2968), your IBM reseller, or your IBM
- Within Canada, call 1-800-565-3344 or 1-800-465-7999.
- Outside the United States and Canada, contact your
IBM reseller or IBM marketing representative.
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