ES10/ES26
Page 39/104
Document status: released
Operating Manual
rev. 01, 03.11.08
5.2 Power-Up Sequence
•
Be sure that the ES10/ES26 is going to be put into operation under the specified
environmental conditions. Avoid temperature shocks after transportation of the ES10/ES26
and allow sufficient time to accommodate with the environmental conditions at the operating
site.
•
If not already realised install the appropriate power supply + fan modules, respectively fan-
only modules.
•
Connect the ES10/ES26 to one or two (in case of redundant power supplies) appropriate
power supply lines. If only one power supply cable (instead of two) is connected to an
ES10/ES26 equipped with redundant power supplies, an alarm will be generated and shown
with a yellow brightening MODULE LED.
•
After start (with appropriate power line connections), the MODULE LED is lightening green
and the LCD
illumination
is on. Then the LCD
illumination
is switched off and all front side
LED’s are lightening yellow for a short time in order to enable a LED test. Afterwards all LEDs
should be lightening green and the microcontroller starts to test the laser and optical
modulator. During this test, which takes about 70 seconds, the optical output power on both
outputs varies between zero power and about twice the nominal power (Poutnom + 3 dB).
Afterwards with no RF-input signal applied, the output power may vary about +/- 1 dB
on both outputs, since the CSO control loop in “channel controlled” mode, which fixes
the bias point of the modulator and consequently the output power, only works
precisely with a RF input signal applied.
•
After this procedure the LEDs should monitor the status of the transmitter.
5.3 Setting appropriate Operating Conditions
5.3.1 Optical output signal
Connect a fiber optic cable with an appropriate, cleaned connector to one of the optical outputs in
order to feed an HFC network. Keep in mind that the ES10/ES26 is a laser class 1M product
according to IEC 60825, which requires adequate safety precautions to avoid hazard to people
working with the transmitter.
5.3.2 Applying an appropriate RF input signal
For proper operation, an appropriate RF input signal within the specifications as given in this
section has to be applied at the RF input port. With an appropriate input signal the transmitter
starts to search for the optimum bias point of the electrooptical modulator. After about 30
seconds, the optical output levels of both outputs are stable.
The optical transmitter ES10/ES26 has a built-in RF power meter function, which monitors the
total rms (root-mean-square) level at the input of the transmitter. This rms level has to be in a
certain range, so that the transmitter can be properly adjusted. The rms level range depends on
the type of ES10/ES26 and is given in the table below.
Please take care that the rms level of
input signal is within the given range!
