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Sample Headend Drawing C4 Downstream to Transmitter 2

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Mark Keefer

This document provides a diagram and details of a sample cable television headend. It shows signals from 4 DS channels being split and transmitted over coaxial cable at frequencies between 717-735 MHz with power levels between 12.5-39 dBm. It then describes the path of the signals through various splitters, combiners, amplifiers and optical transmitters before being transmitted to customer premises equipment. Loss levels over the coaxial cable runs are also specified.

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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 8Way Combiner 12dBLoss All Cable Loss Calculated for RG-59 Headend Cable 9.75 dB Loss/100ft @750MHz 150 FT RG-59 14.5dB Loss 12.5 dBm @ 735MHz39 dBm @ 735MHz DS PICC 10 FT RG-59 1 dB Loss 20 FT RG-59 2 dB Loss 10.5 dBm @ 735MHz Amp Input 2WAY Combiner 4dBLoss 14 dB MAXNET RF AMP SA PRISMA II OPTICAL TX 9 dBm 1310nm 100 FT RG-59 9.75dB Loss 24.5 dBm @ 735MHz 22 dBm @ 735MHz 18 dBm @ 735MHz 25 FT RG-59 2.5 dB Loss 8.75 dBm @ 735MHz Into Optical TX TX10111 SAMPLE HEADEND DRAWING By Mark Keefer NC AMP 10111 150 FT RG-59 14.5dB Loss 20 FT RG-59 2 dB Loss 10.5 dBm @ 735MHz Amp Input 2WAY Combiner 4dBLoss 10 dB MAXNET RF AMP SA PRISMA II OPTICAL TX 12 dBm 1310nm 100 FT RG-59 9.75dB Loss 22 dBm @ 735MHz 25 FT RG-59 2.5 dB Loss 8.75 dBm @ 735MHz Into Optical TX TX10112 24.5 dBm @ 735MHz 14 dB MAXNET RF AMP NC AMP 10112 -20 dB Output Test Point -20 dB Output Test Point VOD INPUT VOD INPUT OM INPUT OM INPUT Broadcast Input Broadcast Input 12.5 dBm @ 735MHz -20 dB Output Test Point -20 dB Input Test Point HSI/PHONE/DATA DOWNSTREAM HSI/PHONE/DATA DOWNSTREAM HSI/PHONE/DATA DOWNSTREAM HSI/PHONE/DATA DOWNSTREAM ARRIS -20 dB Output Test Point 8Way Combiner 12dBLoss -20 dB Input Test Point -20 dB Input Test Point 18 dBm @ 735MHz -20 dB Input test Point -20 dB Output Test Point -20 dB Output Test Point -20 dB Input test Point -20 dB Output Test Point -20 dB Output Test Point -20 dB Input Test Point -20 dB Input Test Point -20 dB Input Test Point

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Sample Headend Drawing C4 Downstream to Transmitter 2

  • 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 8Way Combiner 12dBLoss All Cable Loss Calculated for RG-59 Headend Cable 9.75 dB Loss/100ft @750MHz 150 FT RG-59 14.5dB Loss 12.5 dBm @ 735MHz39 dBm @ 735MHz DS PICC 10 FT RG-59 1 dB Loss 20 FT RG-59 2 dB Loss 10.5 dBm @ 735MHz Amp Input 2WAY Combiner 4dBLoss 14 dB MAXNET RF AMP SA PRISMA II OPTICAL TX 9 dBm 1310nm 100 FT RG-59 9.75dB Loss 24.5 dBm @ 735MHz 22 dBm @ 735MHz 18 dBm @ 735MHz 25 FT RG-59 2.5 dB Loss 8.75 dBm @ 735MHz Into Optical TX TX10111 SAMPLE HEADEND DRAWING By Mark Keefer NC AMP 10111 150 FT RG-59 14.5dB Loss 20 FT RG-59 2 dB Loss 10.5 dBm @ 735MHz Amp Input 2WAY Combiner 4dBLoss 10 dB MAXNET RF AMP SA PRISMA II OPTICAL TX 12 dBm 1310nm 100 FT RG-59 9.75dB Loss 22 dBm @ 735MHz 25 FT RG-59 2.5 dB Loss 8.75 dBm @ 735MHz Into Optical TX TX10112 24.5 dBm @ 735MHz 14 dB MAXNET RF AMP NC AMP 10112 -20 dB Output Test Point -20 dB Output Test Point VOD INPUT VOD INPUT OM INPUT OM INPUT Broadcast Input Broadcast Input 12.5 dBm @ 735MHz -20 dB Output Test Point -20 dB Input Test Point HSI/PHONE/DATA DOWNSTREAM HSI/PHONE/DATA DOWNSTREAM HSI/PHONE/DATA DOWNSTREAM HSI/PHONE/DATA DOWNSTREAM ARRIS -20 dB Output Test Point 8Way Combiner 12dBLoss -20 dB Input Test Point -20 dB Input Test Point 18 dBm @ 735MHz -20 dB Input test Point -20 dB Output Test Point -20 dB Output Test Point -20 dB Input test Point -20 dB Output Test Point -20 dB Output Test Point -20 dB Input Test Point -20 dB Input Test Point -20 dB Input Test Point