IBM RS/6000 User Manual page 56

When used in a Scalable Parallel (SP) environment, a client/server type implementation
is configured. The Service Director client code runs on each of the Scalable Parallel
(SP) nodes. The server component runs on the Control Workstation. In the event of any
system failures, the relevant information is transmitted to the Control Workstation
through the integrated Ethernet. After it has been alerted to the system failure, the
Control Workstation initiates actions to prepare and send the service request.
A modem is required for enabling automated problem reporting to the service center.
Configuration files for several types of modems are included as part of the Service
Director package. Refer to "Modem Configuration Menu" on page 54 for more
information on configuring your modem.
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User's Guide