Promax PROPOWER - 5, User Manual

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USER’S MANUAL. PROPOWER-5
Page 34
07/2006
APPENDIX B.- EVALUATION OF THE FREQUENCY RESPONSE OF MAINS
VOLTAGE NETWORKS (LT) FOR PLC TRANSMISSION
The Power Line Communication technology ( PLC ) uses the electrical distribution
lines for the transmission of information in broadband.
From the distribution centers up to each subscriber the energy is distributed as
low frequency alternate current (50 or 60 Hertz) by means of a Low Voltage between
220 and 440 V.
PLC technology uses the Low Voltage network at high frequencies between 1.6
and 30 MHz to transmit information. In this data transmission three networks take part:
IP network or transport network, Distribution network or Medium Tension (
MT ) and the
Access network or Low Tension ( LT ).
PLC Connection
In order to use this technology the following devices are necessary:
•
PLC Modem. Is the device installed in the home of the subscriber who allows
to the data transmission and voice.
•
Repeater. is installed generally in the consumption meters room of the
company, neighbourhood or parcel of houses and is the device that is
connected with the user modem. Its main function is to regenerate
PLC
signals.
•
Head End device. This device located in the electrical centrals
communicates with the repeaters. These equipments are prepared to connect
with IP networks (Ethernet).
The PLC network topology consists of connecting the modem to Low Voltage by
the user, so that this device communicates with the repeater located in the consumption
meters room.
Figure 35.- PLC measurement sections.