Alcatel-Lucent 1665 Installation Manual page 213

Installation tests
Facility Loopback testing allows the installer to verify the electrical cabling to the 1665
DMX NE. Follow the procedure below to perform a facility loopback test at the 1665
DMX shelf. When the 1665 DMX is cabled to other DS3 terminating equipment, in order
to complete the loopback testing, it will be necessary to contact the Customer Network
Control Center and have a signal established at the port(s) under test.
To test cabling to the DSX-3, use a DS3 test set to transmit and receive toward the facility
loopback.
Perform the following tests for each DS3 circuit cabled to the 1665 DMX.
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Select Fault -> Analysis -> Loopback...
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Choose the DS3 port to test and click Select.
2
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Select Operate and Loopback Type: Facility and click Apply.
3
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Once the loopback is up, a test signal shall be generated at the DS3 terminating equipment
4
which will verify that the cabling is correct.
Important!
loopback.
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While observing the error-free transmission, grasp the DS3 cable about two inches from
5
the BNC connector head and gently rotate (twist) the cable in a clockwise and counter
clockwise direction about 45 degrees (gently).
Result:
connector must be cut off and replaced.
If an error free signal is not received:
Check the LBOs settings using
•
LBOs (p.
Verify that the pack is provisioned for the framing format being sent from the test set,
•
CBIT or M13.
Verify that the port is provisioned for DS3. See
•
Check the DS3/EC1 cabling for proper connections.
•
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365-372-304R7.1
Issue 1, November 2007
A test set can be applied at the DSX-3 to test cabling toward the facility
If any errors are detected while performing this "wiggle test," the BNC
4-5).
(see
View -> Equipment
Verify provisioning (p.
DS3/EC1 and TMUX testing procedure
Setting DS3/EC1 and TMUX
4-22).
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