By Jack Houldsworth
This can be a "source publication" on neighborhood sector Networks (LANs) expertise with the most emphasis on Open method Interconnection (OSI) criteria. It comprises complete details on all elements of LAN platforms from copper and fibre wiring to the media entry regulate structures for Ethernet (CSMA/MD), token ring, token bus, slotted ring and FDDI LAN applied sciences
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Additional info for Open System LANs and their Global Interconnection. Electronics and Communications Reference Series
Twisted pair does have the benefit of being very inexpensive, both in materials costs and in terms of installing connectors. It is also flexible and can have a relatively small cross sectional area. A twisted pair cable which is unscreened cannot exclude electromagnetic fields in the way that coaxial cable can, however it is designed to ensure that the resulting noise is generated equally on both wires. The receiving circuits can be designed to reject noise which is common to both wires (relative to ground) but respond to difference voltages between the wires, which is how signals are transmitted.
Those code options not used are the ones which tend to give poor balance or a lack of transitions for clock recovery. This type of encoding is used in the FDDI LAN and a detailed description is given in that section. FDDI actually uses 24 of the 5 bit codes and also does a further stage of encoding. 3-18 LAN Standards 4B/5B is more efficient than Manchester. 5 MBaud. Against this however there are fewer transitions available from which to recover clock and the balance is not good. 8B/10B and Longer Runs There are many different versions of 8B/10B code.
The network designer has to make a decision based on a number of considerations which include cost, transmission distances, achievable data rate, noise immunity, suitability to access method and distribution of end stations. Frequently a mixture of media types will be used in different parts of a network to give an optimal result. Coaxial cable Coaxial cable has been popular for data communications from the earliest times. It consists of a central conductor of circular cross section which is surrounded by an insulating layer and a concentric conductive shield.
Open System LANs and their Global Interconnection. Electronics and Communications Reference Series by Jack Houldsworth