MultiDyne CTV-2000-FTX Series - Manual (Page 10)

CTV2000-FTX Series CATV Fiber Optic Transmitter Users’ Manual
10
6.3 Installation
a. Mount the equipment in the rack and ground the case.
b. Check input voltage using a digital multimeter in accordance with power requirement. Then turn on
power.
c. Check the message on the VFD and the status of the front panel LED indicator. Push the UP and DOWN
button to check each parameter, insuring that the transmitter is operating normally. (If there is no RF
input, the red LED will flash, and the VFD will display “input RF is low”.)
d. Connect standard fiber test cable to the transmitter’s optical signal output. Measure the output optical
power and confirm that the output optical power is the same as the value displayed on the VFD. (When
measuring the optical power, make sure that optical power meter is set for 1310nm wavelength and that
fiber test jumper is clean.)
e. Measure the input RF signal level with a Cable TV meter or a spectrum analyzer, making sure that input
RF signal is in the range of 15~25dBmV (optimum value 17dBmV). At this time, you can now connect
the RF signal to the RF signal input port of the equipment. This time front panel LED turns to green and
VFD displays RF input value as “RF INPUT = XXdBmV”.
The internal RF power detector is calibrated for 77 analog NTSC channels, so the displayed value may
not be correct, depending upon your actual channel plan. It is possible to correct the displayed value to
read your measured RF level by pressing the UP or DOWN button to scroll the VFD until it displays
‘RF LEVEL=XXdBmV’, and then press ENTER. The VFD will now display ‘MOD
LEVEL=XXdBmV ’ and ‘Please install…’, and the user can now set the RF input level in 1 dBmV
increments by pressing the UP or DOWN buttons. When the displayed value is equal to your tested
value, press ENTER to make it effective, and at that time the VFD will display ‘RF
LEVEL=XXdBmV’. For instance, if real RF input level is 20dBmV, VFD would display “RF
LEVEL= 20dBmV” after operations shown above.
f. Re-measure optical output power, make sure that optical output power being normal, remove standard
fiber test jumper and optical power meter, connect the equipment to network and end the installation.
Chapter 7 Cleaning & Maintenance
Each fiber connector can become contaminated by dust or dirt in the operation process, which can result
in increased optical link loss, or a degraded carrier-to-noise ratio. If you find that the optical receive power
or RF output level of the optical receiver has declined, you should clean and maintain the fiber active
connector. The clean methods are recommended below: