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5.1.3 The “Test” Indicator
The green “Test” LED indicates that V.52 or V.54 tests are running.
5.1.4 The “Error” Indicators
The “Error” indicator LED has two functions:
A. When the 1065RC is in test mode (green “Test” LED is lit), the
error LED glows red when bit errors occur.
B. When not in test mode (green “Test” LED is off), the error LED is
used to indicate an RTS streaming condition. (See Section 5.2) for
information on the antistreaming circuitry.
5.2 ANTI-STREAMING ERROR INDICATOR
When not in test mode (green “Test” LED is off), the front panel
“Error” LED is used to indicate a streaming error. When the Model
1065RC’s antistreaming circuitry is enabled, the RTS signal from the
DTE is timer controlled. The timer begins to count when the DTE rais-
es RTS. If the time period that RTS remains high exceeds the preset
timeout period, the antistream circuit will force RTS low. The “Error”
LED will light red, indicating a streaming condition (RTS continually
on). This feature prevents a malfunctioning terminal from tying-up a
computer port in a multidrop or polling environment. When the DTE
drops RTS, the antistreaming timer is automatically reset and the front
panel “Error” LED turns off. The timeout period is DIP switch selectable
for 12.5 or 50 seconds.
5.3 POWER-UP
There is no power switch on the Model 1065RC: Power is automat-
ically applied to the Model 1065RC 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 1065RC is a “hot swap-
pable” card—it will not be damaged by plugging it in or removing it
while the rack is powered up.
When the local and remote Model 1065RCs are
both powered up
and are passing data
normally, the following LED conditions will exist:
•
PWR = green
•
TD & RD = flashing off and on (green)
•
RTS & CD = green
•
TEST = off
5.4 TEST MODES
The Model 1065RC offers two V.54 test modes and two V.52 test
modes to evaluate the condition of the modems and the communica-
tion 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.
Note: V.54 and V.52 test modes on the Model 1065RC are available for
point-to-point applications only.
5.4.1 LOCAL ANALOG LOOPBACK (LAL)
The Local Analog Loopback (LAL) test checks the operation of the
local Model 1065RC, and is
performed separately on each unit. Any
DTE data sent to the local Model 1065RC 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: by mov-
ing the upper front panel toggle switch RIGHT to “Analog” or
by raising pin 18 on the RS-232 interface (note: be sure DIP
switch S3-5 is enabled). Once LAL is activated, the Model
1065RC 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 1065RC and move it to the right. This will acti-
vate 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.
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 blink
regularly. A successful “511/E” test will confirm
that the loop is in place, and that the Model 1065RC’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
1065RC is wired straight through, and is plugged in properly.
Also, ensure that the Model 1065RC is configured properly.
Then re-check your DTE equipment. If you still have errors,
call Patton Technical Support at (301) 975-1007.
