
Excalibur Multirate DAP Installation and Operation
7-2
The Excalibur Multirate DAP's diagnostic tests are designed so that you can isolate and
verify the different components in the network. Three levels of tests are provided to
facilitate running tests in mixed multiport and singleport environments:
• Aggregate Level - uses the total available aggregate bandwidth for testing all
ports. When using Rate Adaption in the DDSNI mode, the port clock speed will
increase.
• Channel Level - tests the lowest numbered port assigned to the channel. Channel
level tests are available only when the service is set for DDSNI and the Multiport
Framing parameter is enabled.
• Port Level - allows any active port assigned to a channel to be tested.
Notes: If you are performing tests with Multiport or Multirate DAPs equipped with
software revision number SSC0778 or lower, be sure the Diagnostic Compatibility
parameter in the RCP submenu is set to On.
When running tests in mixed multiport and singleport networks, care should be taken in
addressing the far-end singleport unit when performing any test at the port level.
When a test is either activated or cleared on a port in a shared group (multiport unit), data
is momentarily interrupted on all other ports in the unit.
The following sections describe the functions of each of the Excalibur Multirate DAP's
diagnostic tests.
Self-Error Test
The Self-Error Test checks the DAP's internal circuitry for faults. Perform this test at the
start of the fault isolation process to eliminate the DAP as the source of the problem.
When the Self-Error Test is activated, the DAP loops its transmitter to its receiver and
circulates a test pattern through the looped path. (See Figure 7-1.) A test pattern
comparator checks the pattern for errors. The Excalibur Multirate DAP lets you program
how long (1 - 999 seconds or continuous) you wish this test to run. The recommended
length is 60 seconds. If any errors occur during this test, perform a Local-Error Test.
Notes: When the Self-Error Test is active, the DAP will not respond to Non-Latching
Loopback requests from the Telco.
Do not insert or remove the dedicated line when this test is active. Doing so will cause
errors in the test pattern and terminate the test.
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