broadband coaxial systems
There are two classifications of broadband coaxial systems. In a one-way system signals travel in only one direction in the cable. This kind of system is common in cable TV (CATV) systems. In a two-way system signals can travel in both directions on the cable. All traffic that originates from network nodes travels on the inbound channels to the headend. The headend is the origin of all traffic on the outbound channels, routing all messages on inbound channels to the proper outbound channel to reach their destination. Network nodes transmit messages on inbound channels and receive messages on outbound channels.
Two-way systems fall into midsplit or subsplit categories. Midsplit systems divide the cable bandwidth equally between inbound and outbound channels. Subsplit systems put inbound traffic in the 5–30 MHz bands and outbound traffic in the 54–100 kHz bands. This format is the easiest way to retrofit onto a one-way CATV system, and leaves the VHF TV channels on their normal “off-the-air” frequency assignments.
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