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Chapter 1 Introducing the Cisco Wide Area Application Engine
Hardware Features
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Csico Wide Area Application Engine 7326 Hardware Installation Guide
OL-6831-02
Figure 1-7 Serial Port Connector
Ultra320 SCSI Controller System Board Connectors
The WAE-7326 has one SCSI LVD port connector located on the back panel. The
integrated dual-channel SCSI controller with integrated RAID supports two
independent Ultra320 SCSI channels: one external and one internal. Each channel
supports up to 15 SCSI devices. You can use the external LVD SCSI channel
connector on the rear of the server to connect different types of SCSI devices, such
as drives or printers.
This controller uses the following features to perform these actions:
• Double-transition clocking to achieve up to 320 MB-per-second data-transfer
rates.
• Domain-name validation to negotiate compatible data-transfer speeds with
each device.
• Cyclic redundancy checking (CRC), instead of the usual parity checking, to
improve data reliability.
• An active terminator for SCSI bus termination.
The WAE-7326 has one SCSI cable, which connects the internal connector on the
system board to the standard hot-swap-drive backplane. If you plan to attach
external SCSI devices, you must order additional cables. To select and order the
correct cables for use with external devices, contact your Cisco marketing
representative or authorized reseller.
SCSI IDs
Each SCSI device that is connected to a SCSI controller must have a unique SCSI
ID. This ID enables the SCSI controller to identify the device and ensures that
different devices on the same SCSI channel do not attempt to transfer data
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