Line code: Difference between revisions

Revision as of 14:37, 2 December 2019

Revision as of 18:33, 5 December 2019

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Line coding should make it possible for the receiver to synchronize itself to the [[Phase (waves)|phase]] of the received signal. If the clock recovery is not ideal, then the signal to be decoded will not be sampled at the optimal times. This will increase the probability of error in the received data.

Biphase line codes require at least one transition per bit time. This makes it easier to synchronize the transceivers and detect errors, however, the baud rate is greater than that of NRZ codes.<!--[[User:Kvng/RTH]]-->

== Other considerations ==

A line code will typically reflect technical requirements of the [[transmission medium]], such as [[optical fiber]] or [[shielded twisted pair]]. These requirements are unique for each medium, because each one has different behavior related to interference, distortion, capacitance and loss of amplitude.<ref>{{Cite book|url=https://books.google.com/books?id=On_Hh23IXDUC&pg=PA284&lpg=PA284&dq=A+line+code+will+typically+reflect+technical+requirements+of+the+transmission+medium,+such+as+optical+fiber+or+shielded+twisted+pair.+These+requirements+are+unique+for+each+medium,+because+each+one+has+different+behavior+related+to+interference,+distortion,+capacitance+and+loss+of+amplitude&source=bl&ots=pT9kdkk7AV&sig=ACfU3U1fKLdvE_o15CoL1ms2jpqjtbxqhg&hl=en&sa=X&ved=2ahUKEwj4ytKklMvhAhUNTd8KHTERAF8Q6AEwAHoECBMQAQ |title=Network Dictionary |last=Dong |first=Jielin |date=2007 |publisher=Javvin Technologies Inc. |isbn=9781602670006 |language=en |page=284}}</ref><!--[[User:Kvng/RTH]]-->

It is also preferred for the line code to have a structure that will enable error detection.

Note that the line-coded signal and a signal produced at a [[terminal (telecommunication)|terminal]] may differ, thus requiring translation.

A line code will typically reflect technical requirements of the [[transmission medium]], such as [[optical fiber]] or [[shielded twisted pair]]. These requirements are unique for each medium, because each one has different behavior related to interference, distortion, capacitance and loss of amplitude.<ref>{{Cite book|url=https://books.google.com/books?id=On_Hh23IXDUC&pg=PA284&lpg=PA284&dq=A+line+code+will+typically+reflect+technical+requirements+of+the+transmission+medium,+such+as+optical+fiber+or+shielded+twisted+pair.+These+requirements+are+unique+for+each+medium,+because+each+one+has+different+behavior+related+to+interference,+distortion,+capacitance+and+loss+of+amplitude&source=bl&ots=pT9kdkk7AV&sig=ACfU3U1fKLdvE_o15CoL1ms2jpqjtbxqhg&hl=en&sa=X&ved=2ahUKEwj4ytKklMvhAhUNTd8KHTERAF8Q6AEwAHoECBMQAQ|title=Network Dictionary|last=Dong|first=Jielin|date=2007|publisher=Javvin Technologies Inc.|isbn=9781602670006|language=en}}</ref>

== Common line codes ==