background image

  

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 

Содержание LBON4000 ONU

Страница 1: ...LBON4000 ONU User Manual LBON4000 April 2013...

Страница 2: ...Product Description 1 2 0 Safety Notes 2 3 0 Block Diagram 3 4 0 Specifications 4 5 0 RF Connector Installation 5 6 0 Power Connector Installation 5 7 0 AC Power Director 6 8 0 General Set Up 6 9 0 F...

Страница 3: ...elength laser type and band splits for maximum application FEATURES High RF output level 52 48dBmV per Port for 2 4 Ports GaAsFET Technology provides Low Distortions and Low power consumption Downstre...

Страница 4: ...ly damage the retina of an eye Avoid direct exposure to the laser light source Never apply power to this product if the fiber is neither connected nor terminated Never stare directly into a fiber or a...

Страница 5: ...1 Optical Rx input LED TP Optical Rx input Optical Tx out Optical Receiver Optical Transmitter Laser 20dB TP 20dB TP 20dB TP 20dB TP 20dB TP 20dB TP RF Port 1 RF Port 3 RF Port 2 RF Port 4 FIGURE 1 Du...

Страница 6: ...mW 2 3 4 mW RF Input Level dBmV Dynamic Input Range NPR 38 dB Frequency Range Optional 5 65MHz 5 42 MHz Flatness of Frequency Response f 5 to 42MHz 0 75 dB Input Return Loss f 5 to 42MHz 16 dB Optical...

Страница 7: ...the end of the cable now 6 Insert the KS connector and cable to the Housing base and tighten connector KS connectors should be tightened per manufacturer s specifications 7 Using a Philips screw driv...

Страница 8: ...he total upstream RF signal level from all ports is within the node s specified input range then connect the coaxial cable to the node s RF In Out F port 4 The LBON4000 must be grounded Use a split bo...

Страница 9: ...oint 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 de...

Страница 10: ...dsaybroadbandinc com Resources Tab for a spreadsheet calculator The Total RF return level at the input to the laser should be 34 50dBmv NPR 38dB This can be checked at the Return test point 20dB at th...

Страница 11: ...st ATT5 pad value to insure total return level to the laser is 34 50dBmv Measure the RF levels at the node input using the Rev T P and remember that it is 20dB below the actual signal level Please not...

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