Coaxial Cable Specifications
The coaxial cable used to connect the IRIS DC1100 series universal broadband routers at the Headend should be very high-quality cable. Coaxial recommends that you use a Headend-grade coaxial cable or a quad-shield coaxial cable with a minimum of 60% + 40% braid and double foil insulation to connect the cable modem cards to the HFC network. The center conductor must be straight and extend 1/8 inch (3.2 mm) beyond the end of the connector, and the connector should be securely crimped to the cable. The following cables are recommended:
•RG-6 — Standard 75 Ohm
•RG-6/U — Dual or Quad Shielded 75 Ohm
Note
The consistent use of RG-6 or RG-6/U cable is preferred to connect the cable interface to the HFC network. If you connect an RG-6 cable to a cable interface that was previously connected using RG-6 cable, the difference in the center connector diameter might cause intermittent connectivity loss. If you use different types of coaxial cable, the following problems can appear:
Co-channel interference—If signals at the same frequency are carried on long, parallel runs of coaxial cable, interference can occur between the signals. Higher quality cable helps to prevent this with better shielding. Co-channel interference is seen as hum or patterns in analog video channels and intermittent data loss in digital channels.
Damage to the product —Cable interface card connectors are designed for RG-6 cable and connectors. Larger cables can damage the connectors.
Coaxial Networks, Inc. | Page 18 of 60 |
