IBM XSERIES 255 TYPE 8685, Hardware Maintenance Manual And Troubleshooting Manual

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Table 10. Keyboard connector pin-number assignments
Pin I/O Signal
1 I/O Data
2 N/A Reserved
3 N/A Ground
4 N/A +5 V dc
5 I/O Keyboard clock
6 N/A Reserved
Auxiliary-device (pointing device) port
The system board has one auxiliary-device port that supports a mouse or other
pointing device.
The following illustration shows the pin-number assignments for the auxiliary-device
port on the rear of your server.
6
4
2
1
3
5
Table 11. Auxiliary-device connector pin-number assignments
Pin Signal
1 Data
2 Not connected
3 Ground
4 +5 V dc
5 Clock
6 Not connected
Ultra160 SCSI connectors
Your server has an integrated dual-channel Ultra160 small computer system
interface (SCSI) controller. This controller supports two independent Ultra 160/m
SCSI channels: one internal and one external. Each channel supports up to 15
SCSI devices. In addition, this controller uses:
v
Double-transition clocking to achieve high transfer rates
v Domain-name validation to negotiate compatible data-transfer speeds with each
device
v
Cyclic redundancy checking (CRC), instead of parity checking, to significantly
improve data reliability
v An active terminator on the system board for SCSI bus termination
See “Adapter considerations” on page 51 for detailed information about the PCI
buses in your server.
The server comes with one SCSI cable. This cable connects the internal SCSI
channel connector (J15) to the standard hot-swap-drive backplane. If you want to
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xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide