Service manual

Running the Dell Diagnostics: Dell Latitude CP
Displays information about the SCSI controller in an expansion device, the resources
allocated to the controller, and a list of target devices attached to it.
Network Interface Test Group
The subtests in the Network Interface test group verify the basic operation of the network
interface controller in the Dell Latitude C/Port APR or C/Dock Expansion Station. They test the
controller's internal functions, including read and write access to its registers and internal
transmit and receive (loopback) capability. These tests run only if the computer is docked.
Why Run a Network Interface Test?
Running a subtest in the Network Interface test group helps diagnose problems that may occur
while using a Dell Latitude CP computer in a network environment. Most network failures are
caused by one of the following:
● Poor network connections
● Failure in the network controller
● Interrupt conflict (the controller trying to use the same IRQ line as another device)
● Software configuration error
If a problem occurs while using the computer in a network environment, the network
connection should be inspected. If the connection is good, run the Network Interface test group
to determine if the network interface controller is functioning. If the test group is run in a loop, it
can be used to detect intermittent failures.
Subtests
The four subtests in the Network Interface test group confirm the following functions:
● Registers Test
Checks the interrupt generation capability of the controller by writing patterns to the
writable registers in the controller and by reading the patterns back to verify whether
they are accessible and able to retain data.
● Loopback Test
Places the controller into its various loopback modes and tests its ability to transmit and
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