By Xavier Carcelle
Strength line communications (PLC) is readily taking root around the world as an outstanding substitute to Ethernet and wireless in deepest houses, structures with out Ethernet pre-wiring, and parts the place web entry is tough. right here eventually is every little thing telecom engineers want to know in regards to the know-how, functions, gear, layout, and deploy in one handy resource. the 1st English-language reference of its sort, this benchmark source brings engineers fast up to the mark on PLC community structure, functionalities, defense concerns, and functions. It describes PLC apparatus, and addresses key concerns concerned with PLC set up and configuration prior to spelling out step by step strategies for deploying PLC networks in houses. The publication offers layout guidance for large-scale PLC enterprise networks spanning community structure, gear choice, configuration, safeguard, and different key components.
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Extra info for Power Line Communications in Practice
To detect a collision, a station must be capable of listening and transmitting at the same time. In PLC systems like in radio systems, the transmission prevents the station from listening at the same time at the transmission frequency. Because of this, the station cannot hear the collisions. Since a station cannot listen to its own transmission, if a collision occurs, the station continues transmitting the complete frame, resulting in a global loss in network performance. With these specific characteristics in mind, PLC uses a slightly modified protocol compared with CSMA/CD, called the CSMA/CA protocol.
During the back-off, if another station transmits first, the station checks it’s DC (deferral counter) and decrements it until it reaches zero. After having decremented its DC, a station blocks its timer at the BPC value. Once the station transmission is complete, the other stations still wait during a CIFS and the priority phase. They check whether the medium is occupied during and after the CIFS, then decrement their timers again where they had blocked this timer until another station transmits data.
In the same way, the destination station resends the acknowledgment with a part of this field, the RFCS (response FCS) field. 11).