This document contains a diagram and calculations for an example RF headend design connecting an ARRIS C4 distribution system to an optical transmitter. It shows signals from 4 DS channels being split and combined through various splitters and combiners with associated losses before traveling over RG-59 cable to an amplifier, then more cable to an optical transmitter, listing component losses and resulting signal levels. The design drawing includes RF level loss calculations between the ARRIS C4 and optical transmitter.
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Cadant C4 downstream
1. DS0
DS1
DS2
DS3 8WAYSPLIITER8WAYSPLIITER8WAYSPLIITER8WAYSPLIITER
12dBLoss12dBLoss12dBLoss12dBLoss
52 dBm
52 dBm
52 dBm
52 dBm
717 MHz 256 QAM
723 MHz 256 QAM
729 MHz 256 QAM
735 MHz 256 QAM
4WAY
COMB
8dBLoss
RG59 Cable Loss
9.75 dB Loss/100ft @750MHz
150 FT RG-59
14.5dB Loss
16.5 dBm @ 735MHz39 dBm @ 735MHz
DS
PICC
10 FT RG-59
1 dB Loss
20 FT RG-59
2 dB Loss
14.5 dBm @ 735MHz
Amp Input
2WAY
COMB
4dBLoss
10 dB MAXNET
RF AMP
SA PRISMA II OPTICAL TX
9 dBm 1310nm
100 FT RG-59
9.75dB Loss
24.5 dBm @ 735MHz 14.75 dBm @ 735MHz 10.75 dBm @ 735MHz
25 FT RG-59
2.5 dB Loss
8.5 dBm @ 735MHz
Into Optical TX
TX10111
Example Headend RF
design drawing with RF
level loss calculations
between ARRIS C4 and
optical transmitter.
By Mark Keefer
