User`s guide

Performing Loopback Modes and Pattern Tests
6-15
7800-A2-GB26-80
May 1999
To test both ends of a circuit, you must have a device (Device A) send a pattern
to another device (Device B). Device B loops the pattern back to Device A so that
Device A can monitor the integrity of the pattern and test both ends of the circuit
as shown in the following figure.
Sending/Monitoring
a Test Pattern
In Loopback
DEVICE A
DEVICE B
T1
NETWORK
496-15094
" Procedure
To test both ends of a circuit:
1. Double-click on Device A to open the Device Display.
2. Click on the interface you want to test.
3. Click on the Tests button. A Loopback and Pattern Tests dialog appears.
4. From the Remote loopback list, choose an up code to put Device B in
loopback mode. (Alternately, you can select Device B and then choose a
loopback from the Local loopback list.)
5. Choose a pattern to send to Device B.
6. Choose a monitor pattern to verify the test.
The results of the pattern test are displayed in the Results message area. See
Checking the Pattern Test Results on page 6-16.
Verifying that a Test Is Running
You can verify that a test has started and is running using the following
procedure.
" Procedure
To verify the start of a test:
1. Open a Device Display for the device you are testing.
2. Place your cursor over the interface (port) that is under test and press the
right mouse button. A pop-up menu appears.
3. Select Status from the pop-up menu. A dialog is opened that specifies the
Administrative and Operational state of the interface. That is, it specifies Up,
Down, or Testing.
To verify whether or not an interface is in test, note the color displayed by the
device icon in the Device Display. If the interface is in test, it is displayed as a
salmon color.