Specifications

5 OPERATING THE ES10
5.1 Power-Up Sequence
• Be sure that the BK-ES10 is going to be put into operation under the specified
environmental conditions. Avoid temperature shocks after transportation of the BK-
ES10 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 BK-ES10 to one or two (in case of redundant power supplies)
appropriate power supply lines. If only one power supply line is connected to an
ES10 equipped with redundant power supplies, an alarm will be generated and
shown with a yellow brightening MODUL LED.
• After start (with appropriate power line connections), the MODUL 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 by about +/- 1 dB on both
outputs, since the CSO control loop, 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.
5.2 Applying an appropriate RF input signal
With an appropriate input signal the transmitter starts to search for the optimum bias
point of the LiNbO3 modulator. After about 30 seconds, the optical output levels of
both outputs start to become stable.
A fiber optic cable with an appropriate, cleaned connector might be connected to one
of the optical outputs in order to feed a HFC network. Keep in mind that the BK-ES10 is
according to IEC 825 a laser class 1 product which requires adequate safety precautions
to avoid hazard to people working with the BK-ES10.
There are 3 AGC on/off RF modes which can be selected in order to operate the ES10.
5.2.1 Mode: AGC-on, CW unmodulated carriers (factory setting)
Most tests (CNR / CSO / CTB) are performed with unmodulated carriers using e.g. a
Matrix gebnerator or a CATV headend, where the modulation is switched off. These
tests should be performed with the “AGC-on, CW unmodulated carrier” mode. The
OMI
totrms
should be set to the factory setting (0 dBr).
This mode is also the recommended mode for standard operation with real picture
modulation. It should be understood, that for AM-VSB TV channels the carrier levels
with modulation decreases by about 4 dB, however, depending on the picture content.
This decrease in input level has to be compensated by the AGC for optimum signal
transmission.
For a proper operation an appropriate input signal has to be connected to the ES10. At
least 2 RF channels with a channel spacing of 24 MHz (software adjustable) are required
to obtain a stable performance of the BK-ES10.
The nominal channel load (factory settings) for the ES10xxx-yy family however is given
in the table below:
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version: 11-02