The Full Wiki

More info on 10base5

10base5: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


(Redirected to 10BASE5 article)

From Wikipedia, the free encyclopedia

10BASE5 vampire tap Medium Attachment Unit (Transceiver)
10BASE5 transceivers, cables, and tapping tool

10BASE5 (also known as thicknet) is the original "full spec" variant of Ethernet cable, using special cable similar to RG-8/U coaxial cable. This is a stiff, 0.375-inch (9.5 mm) diameter cable with an impedance of 50 ohms (Ω), a solid center conductor, a foam insulating filler, a shielding braid, and an outer jacket. The outer sheath is often yellow-to-orange/brown foam fluorinated ethylene propylene (for fire resistance) so it often is called "yellow cable", "orange hose", or sometimes humorously "frozen yellow garden hose".[1]

10BASE5 has been superseded due to the immense demand for high speed networking, the low cost of Category 5 Ethernet cable, and the popularity of 802.11 wireless networks. Both 10BASE2 and 10BASE5 have become obsolete.


Name origination

The name 10BASE5 is derived from several characteristics of the physical medium. The 10 refers to its transmission speed of 10 Mbit/s. The BASE is short for baseband signalling as opposed to broadband, and the 5 stands for the maximum segment length of 500 metres (1,600 ft).

Network design

The maximum practical number of nodes that can be connected to a 10BASE5 segment is limited to 100 and transceivers may be installed only at precise 2.5-metre intervals. This distance was chosen to not correspond to the wavelength of the signal; this ensures that the reflections from multiple taps are not in phase.[2] These suitable points are marked on the cable with black bands. The cable must be one linear run; T-connections are not allowed. A 50-ohm resistive terminator is required at each end of the cable.

Transceivers can be connected to cable segments with N connectors, or via a vampire tap, which allows new nodes to be added while existing connections are live. A vampire tap clamps onto the cable, forcing a spike to pierce through the outer shielding to contact the inner conductor while other spikes bite into the outer braided shield. Care must be taken to keep the outer shield from touching the spike; installation kits include a "coring tool" to drill through the outer layers and a "braid pick" to clear stray pieces of the outer shield.

See also


  1. ^ All-in-One Network+ Certification Exam Guide, Mike Meyers, 3rd Ed., McGraw-Hill, 2004, p. 79.
  2. ^ sponsor Technical Committee on Computer Communications of the IEEE Computer Society. (1985), IEEE Standard 802.3-1985, IEEE, pp. 121, ISBN 0-471-82749-5  

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.



Got something to say? Make a comment.
Your name
Your email address