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REMPLI - Frequently Asked Questions
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Powerline Communication
PLC Technology has been criticized lately because of electromagnetic interferences. How does REMPLI deal with this topic?
The PLC in REMPLI uses the frequency band of 9 to 148.5 kHz (CENELEC)
or 9 to 500 kHz (FCC part 15). The radio emission in this frequency
bands are much lower than in the frequency band of 1.5 to 30 MHz used
for Broadband PLC.
In these frequency bands there are no known conflicts with radio systems.
How is the situation of regulation to use this technology?
In all of Europe and most countries of the world there are regulations to allow the use of the REMPLI system.
Why do you not use Broadband PLC?
Broadband PLC is developed for telecommunication services like Internet
traffic and Voice over IP. The communication structure is very
ineffective for transporting metering data and automation commands.
This does not fit to the requirements of utility companies for
automation. The REMPLI system is intended to support these different
real time critical applications.
Additionally, the higher frequency bands of broadband PLC reduce the
maximum distance and reliability of communication. Therefore a lot more
repeaters are required to achieve complete coverage. The business cases
for Broadband PLC are calculated to connect 10 % of all households;
most of the households are not connected and the systems are not
designed to connect hundreds of participants.
Is it possible to use REMPLI and Broadband PLC on the same power-line?
Of course. Due to the different frequency bands it should be no problem to use both systems on the same power-line in parallel.
What is PLC anyway?
Power-line communication (PLC) is the transfer of data over the existing power supply grid. Different types of systems are known.
Narrow Band PLC systems use frequencies below 500 kHz and are operating
since several decades without any problems of electromagnetic
emissions. REMPLI develops a new PLC system for these frequencies with
significantly improved performance over existing systems.
Broadband PLC uses frequencies between 1.5 and 30 MHz. The data rates
are higher, but the coverage and reliability is lower. Problems with
electromagnetic emissions in connection with PLC communication always
refer to Broadband PLC and not Narrow Band PLC.
Will the PLC that is used in REMPLI interfere with my wireless network or short wave radio?
Wireless networks use much higher frequency bands and do not interfere with PLC.
Short wave radio uses the same frequencies as Broadband PLC and
disturbances for short wave radios are possible. The Narrow Band PLC
system used for REMPLI, however, uses much lower frequencies; this
eliminates any possibility of interferences with short wave or medium
wave (AM) radio.
What data rates do you expect?
The requirements in REMPLI are defined over reliability, real time,
redundancy and duration of transmission tasks. To fulfil these
requirements the system is optimised towards small independent packets
to a lot of participants in a network and not on maximum data rate in
point to point connection. The designed maximum data rate of the chip set is 500 kbps; this is the "raw" bandwidth that is available for all kinds of communication
(including network control messages, checksums of data, repetitions,
error signalling and the like); the available bandwidth for application
payload data will therefore be below this value.
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