Broadband distribution network
Broadband distribution networks are used to transmit radio and television programs from central distribution points to the subscribers. The expansion of a nationwide technical infrastructure for broadband distribution networks goes back to decisions made in the 1970s , particularly the recommendations of the Commission for the Expansion of Technical Communication Systems ( KtK ) from 1976 . The broadband distribution networks were originally designed for the newly emerging cable television networks . Today the broadband distribution networks planned at that time are considered technically obsolete and have been replaced by supra-regional fiber optic cable networks or are only operated as local cable television networks.
Broadband distribution networks require a one-way flow of messages from a source (the sender ) to a destination (the recipient , usually the household). In contrast to broadband communication in broadband switching networks , the receiver cannot become the sender here. The best known broadband distribution network is cable television .
The network structure of a local broadband distribution network consists of
- central facilities (network level 2),
- the actual broadband distribution network (network level 3) with active and passive components, as well as
- the connected house transfer points with the private house distribution networks behind them (network level 4).
Cable television requires a tree-like network structure ; H. a network that branches out from one point.
The broadband distribution networks were built using copper coaxial cable technology, as this technology enabled the most economically sensible coverage of requirements at the beginning of the cabling. Depending on the design, the bandwidth of this copper coaxial cable currently ranges from 450 MHz to 1 GHz. Initially, 90 percent of the existing cable networks had a bandwidth of 47 to 450 MHz; about 35 analog channels or 140 digital programs can be transmitted via this.