6
MODEL V732
mat has not been selected.
2. DATA OUT LED is slowly flashing between amber,
green, and off. This indicates that the test mode is gen-
erating an output pattern and sending it out on copper.
3. DATA IN LED should mimic the DATA OUT LED. This
indicates the data transmit/receive circuitry is working
properly.
4. LEVEL/LOSS indicates received fiber signal strength.
The receiving unit (position E) should behave as follows:
1. ENABLED LED is red, since a valid data format is not
selected.
2. DATA OUT LED should slowly flash amber, green, and
off. This indicates that the fiber path from the transmit-
ting unit set for TEST MODE is reliable.
3. DATA IN LED should be off, since there is no input cop-
per connection made.
4. LEVEL/LOSS should be green indicating that sufficient
optical power is being received.
When the test is completed, the test can be run again in the
opposite direction by changing the DATA SELECT switch
positions and moving the loopback cable to the opposite
end. Having done this, you have proven that the copper-in-
to-fiber-to-copper-out conversion is working in both direc-
tions.
VIDEO TEST PATTERNS
The V732 includes an internal video test pattern generator
that can ease installation and troubleshooting. The test pat-
terns generated can notify the user of a fiber or video
source failure by outputting specific test patterns on the
user’s monitor. Also, a special “ramp” test pattern can be
generated when the V732T is placed in test mode. The test
patterns verify proper functionality of the digital decoding
process as well as troubleshooting fiber optic interconnec-
tions.
Follow the procedures described in VIDEO FORMAT/TEST
PATTERN GENERATOR on page 1 to enable the test pat-
tern generator.
Table 12 provides a summary of the on-screen diagnostic
displays that are available
LED OPERATION
The V732 has 5 LED indicators that are very useful in
describing the current state of operation, as well as the cur-
rent status of data flow and fiber optic signal strength.
These indicators are LEVEL /LOSS, VIDEO IN
(Transmitter) or VIDEO OUT (Receiver), DATA IN, DATA
OUT, and ENABLED. Tables 13 and 14 provide a summa-
ry of LED operation. See Figure 4.
They function as follows:
LEVEL/LOSS Indicator
This LED is useful for indicating the relative optical signal
strength at the fiber optic receiver. When sufficient optical
power is being received, the LED shines green. As the opti-
cal power is decreased, as happens through long fiber
runs, splices, or connections, the intensity of the
LEVEL/LOSS LED will diminish until the limit of the V732's
sensitivity range has been reached. At this point the LED
will be OFF. If any additional optical attenuation is intro-
duced, the LEVEL/LOSS LED will turn bright RED, indicat-
ing an insufficient amount of optical power is being
received. All data will default to its failure state level to elim-
inate bus contention.
VIDEO IN (or OUT) Indicator
This LED indicates the strength of the video signal. VIDEO
IN on the transmitter remains green as long as adequate
video signal is being input to the transmitter. If the video
input becomes too weak, the LED turns red. The VIDEO
OUT LED on the receiver performs a similar function,
except that it refers to the video that is output from the
receiver.
NOTE:
The V732 monitors the sync signals on the video to
determine the strength of the signal. It does not monitor the
brightness signal. Thus, if the scene in front of a camera is
totally dark, producing a blank monitor screen, the VIDEO
LEDs can still be green.
