To meet the growing demand for high capacity applications, many operators are considering a gradual migration to CCAP, replacing their existing CMTS and edge QAMs over time. If you are planning such an approach, are you aware of the associated challenges?
The CCAP standard offers combined CMTS and edge QAM functionality in one hardware solution. When all signals are provided from a CCAP platform, there is no need for a combining system. However, if a gradual migration is taking place, headend combining systems will need to work alongside the new CCAP platform. It is also likely that, as nodes become smaller and smaller, you will need to invest in new combining and insertion equipment. We believe that existing headend combining systems built with splitters and directional couplers will not meet CCAP isolation requirements.
The downstream RF interference specification from CCAP requires a minimum port to port isolation of 70 dB from 50 MHz to 550 MHz, and > 65 dB from 550 MHz to 1002 MHz. Combining devices need to have isolation levels to match the CCAP EQAMs. Standard splitters and directional couplers will not give you this level of isolation. And isolation issues need to be addressed without compromising power consumption, heat dissipation and rack space in the headend environment.
Technetix has developed the NCI, a narrow cast solution which complies with the CCAP isolation requirement of ≥70 dB. The NCI solution has also been designed to deliver maximum flexibility for minimum rack space, along with low power consumption and high isolation.
Download the NCI whitepaper to find out more.
Read more about the NCI system.