Specifications

Troubleshooting
7-5
MARKING
GEN
TEST
PATTERN
GEN
TEST
PATTERN
COMP
TRANSMITTER
RECEIVER
TX
RX
TRANSMITTER
RECEIVER
TEST
PATTERN
GEN
TEST
PATTERN
COMP
MARKING
GEN
RX
TX
LINES
LOCAL DAP REMOTE DAP
Figure 7-4. End-to-End Error Test
Network-Error Test
You can verify operation of the DDS lines by running a Network-Error Test. The
Network-Error Test must be activated jointly through the DAP's front panel and the
Telco's Test Set. You may substitute the Telco's equipment with your BERT test
equipment at the remote DAP, or you may substitute the test equipment by initiating the
test from the remote unit. This test can not be activated from CMS and should not be
activated from the RCP.
During this test, the DAP generates a test pattern through the DDS interface into the
network. (See Figure 7-5.) The DAP monitors for an incoming test pattern and reports
any 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. Errors
occurring during this test generally indicate that the problem lies with the DDS lines.
Note: The Network-Error Test is a full bandwidth test.
RECEIVER
LINES
REMOTE DAP
LOCAL DAP
TELCO
TEST
SET
TRANSMITTER
TX
RX
Figure 7-5. Network-Error Test