5.0 OPERATION
Once you have configured each Model 1045RC 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 1045RC: Power is
automatically applied to the Model 1045RC 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 1045RC 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 1045RC 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 1045RC, and is
performed separately on each unit. Any
data sent to the local Model 1045RC 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 SW1-8 is enabled). Once LAL is activated,
the Model 1045RC 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 1045RC and move it to the right. 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 left, 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 1045RC’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
1045RC is wired straight through, and is plugged in properly.
Also, ensure that the Model 1045RC is configured properly.
Then re-check your DTE equipment. If you still have errors,
call Patton Technical Support at (301) 975-1007.
5.2.2 REMOTE DIGITAL LOOPBACK (RDL)
The Remote Digital Loopback (RDL) test checks the performance of
both the local and remote Model 1045RCs,
and the communication link
between them. Any characters sent to the remote 1045RC 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
1045RC 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 1045RC and move it to the right. 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 left, 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 1045RC’s built-in “511”
generator and detector are working properly.
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