Allied Electronics Data Handbook by N. Cooke

By N. Cooke

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The diameter of the individual fibres is minute although when made up into a cable with protective layers this advantage is only gained if multiple fibres are included. Being electrically non-conductive it is excellent for safety purposes and grounding is not an issue. Optical fibre is virtually immune from electromagnetic interference and this is beneficial in noisy environments. Conversely it does not emit radiation and this makes it good for use in secure systems. With these advantages it might be expected that fibre would be in universal use.

This environment is to an increasing degree a regulatory one. In some countries it is already necessary for equipment to LAN Standards 3-23 pass emission tests. Levels of stringency vary dependent on the country and the part of the spectrum under consideration but in the near future a common standard will be established for EEC countries. Under these new regulations susceptibility testing may be required for the first time ever. Emission RFI emission is generally considered as a more serious issue than susceptibility to interference, particularly with LANs which have extensive error detection and recovery mechanisms.

8. When designing a LAN physical layer it is necessary to have an idea of a worst case environment so that this type of curve can be related to factors like the allocation of the jitter budget to this source, the amplitude on the interface needed to cause this jitter (taking into account signal amplitude and rise times), the data rate and the required bit error rate. Thermal Quantisation and Shot Noise Fibre optic systems are immune to the noise sources already described, other than some polarisation in strong magnetic fields.

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