10BASE5

10BASE5, also called Thick Ethernet, Yellow Cable, Thicknet or Thickwire, is one of the first Ethernet networks.

10BASE5 for a 10 mm thick coaxial cable ( RG -8) is used with a characteristic impedance of 50 ohms. For connecting devices, a hole must be drilled into the cable by means of a template through which a contact of a special clamp ( Vampire terminal) of the transceiver inserted and clamped. On this transceiver (also: MAU - Media Access Unit) is connected the network card of the computer by means of the AUI ( Attachment Unit Interface) via a connecting cable. This standard provides 10 Mbit / s data rate transmission in base - band and 500 m range with a maximum of 100 participants. The line has no branches, and sit at the ends 50 ohm termination resistors. Due to the earlier widespread 10BASE5 is still in some installations in operation.

Properties

The most important cable properties of 10BASE5 are:

• Wave impedance of 50 ohms
• High noise immunity
• Low attenuation, therefore, are segment lengths of over 500 m are possible.
• A maximum of 5 segments with a total max. 3 occupied segments, each with max. 100 stations.
• 10BASE5 only works in half duplex mode
• Maximum transfer rate of 10 Mbit / s

Features

Important features are:

• Each station is connected through a transceiver to the bus.
• The minimum distance between the transceivers is 2.5 m. This is necessary so that the signal reflections on the transceiver port may not add up in phase, which would have disorders of network traffic result.