Patton electronic 1018RC user manual Power-Up, Test Modes, Local Analog Loopback LAL

5.0 OPERATION

Once you have configured each Model 1018RC and connected the cables, you are ready to operate the units. Section 5.0 describes the power-up procedure and the built-in V.54 and V.52 test modes.

5.1 POWER-UP

There is no power switch on the Model 1018RC: Power is automatically applied to the Model 1018RC when its card-edge connector makes contact with the chassis’ mid-plane socket, or when the chassis’ power supply is turned on. Note: The Model 1018RC is a “hot swappable” card—it will not be damaged by plugging it in or removing it while the rack is powered up.

5.2 TEST MODES

The Model 1018RC offers two V.54 test modes and two V.52 test modes to evaluate the condition of the modems and the communication link. Both sets of tests can be activated physically from the front panel. The V.54 test can also be activated from the RS-232 interface.

5.2.1 LOCAL ANALOG LOOPBACK (LAL)

The Local Analog Loopback (LAL) test checks the operation of the local Model 1018RC, and is performed separately on each unit. Any data sent to the local Model 1018RC in this test mode will be echoed (returned) back to the user device. For example, characters typed on the keyboard of a terminal will appear on the terminal screen. To perform a LAL test, follow these steps:

1.Activate LAL. This may be done in one of two ways: First, by moving the upper front panel toggle switch RIGHT to “Analog”. Second, by raising pin 18 on the RS-232 interface (note: be sure DIP switch SW1-6 is enabled). Once LAL is activated, the Model 1018RC transmit output is connected to its own receiver. The “Test” LED should be lit.

2.Verify that the data terminal equipment is operating properly and can be used for a test.

3.Locate the lower of the two toggle switches on the front panel of the Model 1018RC and move it to the left. This will activate the V.52 BER test mode and inject a “511” test pattern into the local loop. If any errors are present in the loop, the red “Error” LED will blink sporadically.

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4.If the BER test indicates no errors are present, move the V.52 toggle switch to the right, thus activating the “511/E” test with periodic errors. If the test is working properly, the red “Error” LED will glow. A successful “511/E” test will confirm that the loop is in place, and that the Model 1018RC’s built-in “511” generator and detector are working properly.

5.If the BER test indicates that errors are present, check to see that the RS-232 cable connecting the DTE to the Model 1018RC is wired straight through, and is plugged in properly. Also, ensure that the Model 1018RC is configured properly. Then re-check your DTE equipment. If you still have errors, call Patton Technical Support at (301) 975-1007.

5.2.2REMOTE DIGITAL LOOPBACK (RDL)

The Remote Digital Loopback (RDL) test checks the performance of both the local and remote Model 1018RCs, and the communication link between them. Any characters sent to the remote 1018RC in this test mode will be returned back to the originating device. For example, characters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote Model 1018RC and looped back. To perform an RDL test, follow these steps:

1.Activate RDL. This may be done in two ways: First, by moving the upper front panel toggle switch LEFT to “Remote”. Second, by raising pin 21 on the RS-232 interface.

2.Verify that the DTE equipment on the local end is operating properly and can be used for a test.

3.Locate the lower of the two toggle switches on the front panel of the 1018RC and move it to the left. This will activate the V.52 BER test mode and inject a “511” test pattern into the remote loop. If any errors are present in the loop, the red “Error” LED will blink sporadically.

4.If the BER test indicates no errors are present, move the V.52 toggle switch to the right, thus activating the “511/E” test with periodic errors. If the test is working properly, the red “Error” LED will glow. A successful “511/E” test will confirm that the loop is in place, and that the Model 1018RC’s built-in “511” generator and detector are working properly.

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