Specifications
Excalibur Multirate DAP Installation and Operation
6-38
• V.54 Digital Loop Test - differs from the standard Digital Loop Test in that it
creates only one loop. It loops its receive data from the line to its transmitter
input.
• Loop 2 and Loop 2 Error Tests - Loop 2 Test places the far-end unit into a
Digital Loop or a V.54 Digital Loop depending on the Remote Digital Loop
parameter setting in the DAP Configuration submenu for aggregate level tests
only. In the Loop 2 Error Test, the local unit generates a 2047 or 511 test pattern
through the looped path. The error count can be monitored and errors can be
inserted at the local unit.
Notes: To select the test pattern for the Self-Error Test, End-to-End Error Test, or Loop
2 Error Test, enter the DAP Configuration submenu and press the button beneath Pttrn.
Then press the button beneath the desired test pattern.
If the Diagnostic Compatibility parameter in the RCP submenu is set to On, the DAP will
generate the 511 test pattern for the End-to-End Error Test and the Loop 2 Error Test
during dial backup operation regardless of the pattern selected in the DAP Configuration
submenu.
Service loops are part of the ISDN network's diagnostic capabilities. They are used to
isolate trouble conditions in the local serving loop and the customer's data
communications equipment. The Excalibur Multirate DAP provides the Full Channel
Loopback Test and the B-Channel Loopback Test initiated by the ISDN network. An
event message is displayed on the DAP’s front panel when the DAP is performing a test
initiated by the ISDN network. However, the Test LED does not light and there is no
indication in the DAP’s Status submenu or on the CMS system console when these loops
are active.
Activating the Tests
See the "Analog Dial Line Tests" section in this chapter for instructions on activating the
Dial Tone Test and End-to-End Call Test.
To activate the Self-Error, End-to-End Error, Digital Loop, V.54 Digital Loop, Loop 2,
and Loop 2 Error Tests. follow these steps starting from the Diagnostics submenu:
1. Press the button beneath Aggr.
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Escape
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