7
Forward Path Set-up
)
:
(Refer to Figure 7)
1.
Verify that the received optical level indicated on the “Optical Rx LED “ strip is as expected.
2.
The Optical node comes factory set with attenuators already in place. The attenuator used to
establish the output tilt is factory set with a 9dB attenuator. That will produce approximately 12-13db
of tilt between 54 and 1000MHz. That indicates there is approximately 3
– 4dB of built in equalization.
3.
While monitoring the forward
Out1
test point (-20dB), and with a 0dB pad in
ATT3
position, place
desired attenuator value into EQ1 for desired output tilt.
4.
Countinuing to monitor
Out1
test point (-20dB), adjust pad value in
ATT3
position for the desired
output level. Verify that the level is correct at both ends of the bandwidth. Output 1 & 2 are now set
up in the Forward Path.
5.
Repeat steps 3 & 4 for Output 3 & 4, using test point on
Out3
, and
ATT4
and
EQ2
positions.
Downstream
Incoming Fiber
ATT4; Fwd RF
attenuator
ATT3; Fwd RF
attenuator
EQ2; Fwd
Equalizer For
Port 3&4; Tilt set
with attenuator
EQ1; Fwd Equalizer For Port
1&2; Tilt set with attenuator
Optical RX LED
Display TP
Figure 7
User Manual
LBON4000
LBON4000 April 2013
