10BROAD36 is an obsolete computer network standard in the Ethernet
family. It was developed during the 1980s and specified in IEEE
The standard supports 10 Mbit/s
Ethernet signals over standard
75 ohm cable television (CATV) cable over a 3600-meter range.
10BROAD36 modulates its data onto a higher frequency carrier signal,
much as an audio signal would modulate a carrier signal to be
transmitted in a radio station. In telecommunications engineering,
this is a broadband signaling technique.[a]
Broadband provides several
advantages over the baseband signal used, for instance in 10BASE5.
Range is greatly extended (3600 meters, versus 500 meters
for 10BASE5), and multiple signals can be carried on the same cable.
10BROAD36 can even share a cable with standard television channels.
3 See also
6 External links
Institute of Electrical and Electronics Engineers
Institute of Electrical and Electronics Engineers standards
IEEE 802 published the standard that was ratified in 1985 as
an additional section 11 to the base
Ethernet standard. It was also
issued as ISO/IEC 8802-3 in 1989.
10BROAD36 was less successful than its contemporaries because of the
high equipment complexity (and cost) associated with it. The
individual stations are much more expensive due to the extra radio
frequency circuitry involved; however the primary extra complexity
comes from the fact that
10BROAD36 is unidirectional. Signals can only
travel one direction along the line, so head-end stations must be
present on the line to repeat the signals (ensuring that no packets
travel through the line indefinitely) on either another, backwards
direction frequency on the same line, or another line entirely. This
also increases latency and prevents bidirectional signal flow.
The extra complexity outweighed the advantage of reusability of CATV
technology for the intended campus networks and metropolitan area
networks. An installer at
Boston University using the Ungermann-Bass
product noted that no installers understood both the digital and
analog aspects of the system. In wide area networks it was quickly
replaced by fiber-optic communication alternatives, such as 100BASE-FX
(which provided ten times the data rate). Interest in cable modems was
revived for residential Internet access, through later technologies
such as the Data Over Cable Service Interface Specification (DOCSIS)
in the 1990s.
^ The term broadband has since been applied to describe high-speed
Internet access, a different topic.
^ "802.3b-1985 - Supplement to 802.3:
Broadband Medium Attachment Unit
Broadband Medium Specifications, Type
10BROAD36 (Section 11)".
IEEE Standards Association. 1985. Retrieved July 12, 2011.
^ "Information processing systems — Local and metropolitan area
networks — Part 3: Carrier sense multiple access with collision
detection (CSMA/CD) access method and physical layer specifications".
Retrieved July 12, 2011.
^ Paula Musich (July 20, 1987). "
Broadband user share pains, gains".
Network World. pp. 1, 8. Retrieved July 14, 2011. Broadband
networks employ frequency-division multiplexing to divide coaxial
cable into separate channels, each of which serves as an individual
Ethernet Technical Summary". Techfest web site. 1999.
Archived from the original on 16 July 2011. Retrieved July 12,
Ethernet family of local area network technologies
2.5 and 5 Gbit/s
25 and 50 Gbit/s
40 and 100 Gbit/s
200 and 400 Gbit/s
Power over Ethernet