11.2 Distribution Networks
RF Networks
➢ RF networks need to be tested to pass digital signal to industry standards. Care should be taken to
inspect the system for old crimp style connectors, poor quality amplifiers, taps and splitters. Wall
plate splices and TV jumpers should also be inspected and replaced as necessary.
➢ Signal levels should be within industry specifications. 0-5dBmV with >38dB Modulation Error Rate
(MER) at the TV.
➢ If you are not experienced with digital RF networks it is recommended you contract a qualified RF
system technician to design, install, and troubleshoot the RF plant.
IP Networks
➢ IP Networks need to utilize multicast address schemes.
➢ Switches must be enabled for IGMP (Internet Group Management Protocol)
➢ Network Cabling must be installed in accordance with industry standards
➢ COM3000 provides layer two switch in COM400 chassis with IGMPv2 snooping.
Existing Video Services
Careful consideration should be focused on any existing services that will remain on the
distribution network. It is recommended that you record the RF frequencies of all services on the
network including:
➢ Video on Demand
➢ Private channels
➢ Cable modem (CMTS)
➢ Off air programming
12 Channel Lineup
Determine in advance what networks the customer will require on the system and the channel
assignments for each.
Assign RF carriers to each network. If possible, start RF channel lineup at ch 23 or higher (super-
band).
This will:
➢ Eliminate possible signal ingress into the RF plant from VHF broadcast signals
➢ Keep the property signal out of the aeronautical frequencies in the 126 – 134 MHz range.
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