10BASE2

10BASE2, and thin Ethernet, Thin Wire or Cheapernet, is the development of network technology 10BASE5 ( Thick Ethernet ). As a transmission medium, a thin, flexible coaxial cable (RG -58) diameter of about 6 mm was used. It appeared as an alternative to 10BASE5 at which mechanically stickier, thicker ( about 1 cm in diameter) and was significantly more expensive due to the high material costs. The lower price meant that 10BASE2 was often referred to as Cheapernet.

While the compound of the 10BASE5 connectable computer system is carried out by puncturing the pipe, wherein 10BASE2 connector (T- pieces ) were used. With less bending radius, easy wall sockets ( formerly similar TAE plug ), the line umlenkten when plugged on the casting strand, and received back from there, easier installation technique and significantly cheaper hardware (hubs, network cards, cables, elimination of transceivers ) could 10BASE2 ( and thus Ethernet) prevail in the 1980s on the market.

10BASE2 networks must always be terminated with a 50 ohm BNC terminator ( terminator); incorrect or no termination is connected to the network bus computers lose their connection.

Topology

10BASE5 10BASE2 and require a bus topology, which is quite troublesome. Therefore, 10BASE2 was later replaced by 10BASE -T twisted-pair cables, which enabled star topology.

During a transitional period computer required for connection to 10BASE2 transceiver. Later, these were integrated into the network card.

Specifications

  • Impedance: 50 ohms
  • Cable name: RG 58
  • Maximum segment length: 185 m ( 200 yards - therefore 10BASE2 )
  • Total length of the network with repeater: 925 m (5 segments, each 185 m)
  • A maximum of 3 segments with a maximum of 90 (30 stations per segment, after the 5- 4-3 - rule) connected stations
  • Minimum distance between the tees: 0.5 m.
  • Maximum distance between bus connection ( tee) and transceiver approximately 30 cm.
  • It can download only one station data, otherwise collisions.
  • 10BASE2 is operating in half duplex mode
  • The maximum transfer rate of 10BASE2 is 10 Mbit / s

When cabling systems, such as EAD connectors that fixed wiring is separated into the junction box and redirected via the connection cable by inserting the connecting cable. The connecting cables must be double counted included in the maximum segment length. The located at the other end of the connection cable BNC connector is the T-piece and thus the maximum distance between bus and transceiver is not exceeded. The cable length can be very short between the junction boxes, since the minimum distance between the tees is maintained by the connecting cables.

5-4-3 rule EAD-socket
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