10BROAD36

10BROAD36 is an obsolete computer network standard in the Ethernet family of standards. It was developed in the 1980s and is defined in IEEE 802.3b-1985.

The standard supports Ethernet signals at a speed of 10 Mbps over a standard television (coaxial) cable with a resistance of 75 ohms (CATV) at distances up to 3600 meters. The original Ethernet 10BASE5 standard used a coding method (also known as linear coding) where the message is simply encoded directly on the wire without any kind of carrier wave. Instead, 10BROAD36 modulated data at a higher carrier frequency, much like an audio signal modulates a carrier signal when transmitted over a radio. This process has been called time bandwidth; today this term has less significant marketing meaning. Broadband data transfer has several advantages over the traditional coding method. The range was greatly expanded (3600 meters compared to 500 meters for 10BASE5) and multiple signals could also be on the same cable. 10BROAD36 could even share cable with standard television channels. The IEEE 802 Institute of Electrical and Electronics Engineers Standards Committee published a standard that was ratified in 1985 as an additional section 11 to the main Ethernet standard. ^[1] It was also issued as ISO / IEC 8802-3 in 1989 ^[2] .

10BROAD36 was less successful than its contemporaries due to the high complexity of the equipment associated with it. Individual stations were much more expensive due to the additional included radio frequency circuit; however, the main additional complexity was that 10BROAD36 was unidirectional. Signals could only move in one direction along the line.

The added complexity outweighed the merits and reusability of CATV technology for targeted campus and citywide networks ^[3] . In global networks, this standard was quickly replaced by fiber-optic communication alternatives, such as 100BASE-FX (which provided a tenfold increase in data transfer speed). Interest in cable modems has been revived for Internet access in residential networks through more recent technologies such as the Data Over Cable Service Interface Specification ( DOCSIS ) in the 1990s.