During the VII
meeting of the Permanent Consultative Committee I, Telecommunication
Standardization, it will be possible to have on September 22 from 9:00
am to 12:30 pm, within the work of the Working Group on Eonomic
Aspects and Tariff Principles,an Expert
Panel on Broadband over
Power Lines Communications (BPL/PLC) that will
analyze economic, regulatory and commercial aspects on BPL/PLC.
You can download the
information purposes we include part of the information included in
Amendment of Part 15 which establishes
rules for Access Broadband over Power Lines. FCC
Report and Order
October 28, 2004
Broadband over Power Line (Access BPL) systems is a new type of
carrier current technology that provides access to high speed
broadband services using electric utility companies’ power lines.
This new broadband delivery medium could also serve to introduce
additional competition to existing cable, DSL, and other broadband
Carrier current systems use alternating current (AC) electric power
lines to carry communications by coupling very low power RF signals
onto the AC electric wiring.
Traditionally, these systems have included amplitude modulated (AM)
radio systems on school campuses and devices intended for the home,
such as intercom systems and remote controls for electrical appliances
recently, carrier current devices generally operated on frequencies
below 2 MHz and with relatively limited communications capabilities.
In the last few years, the availability of faster digital processing
capabilities and the development of sophisticated modulation schemes
have allowed the development of new designs for carrier current
devices that are capable of overcoming earlier technical obstacles
caused by the inherent noise and impedance mismatch of power lines.
These new designs have led to the development of BPL systems that use
spread spectrum or multiple carrier techniques with highly
adaptive algorithms to effectively counter the noise in the line.
new low-power, unlicensed BPL systems provide high speed digital
communications capabilities by coupling RF energy onto either the
power lines inside a building (“In-House BPL”) or onto the medium
voltage power delivery lines (“Access BPL”).
In-House BPL systems use the electrical outlets available within a
building to transfer information between computers and between other
home electronic devices, eliminating the need to install new wires
between devices, and hence facilitating the implementation of home
Access BPL systems deliver high speed Internet and other broadband
services to homes and businesses. In addition, electric utility
companies can use Access BPL systems to monitor, and thereby more
effectively manage, their electric power distribution operations.
Because Access BPL capability can be made available in conjunction
with the delivery of electric power, it may provide an effective means
for “last-mile” delivery of broadband services and may offer a
competitive alternative to digital subscriber line (DSL), cable modem
services and other high speed Internet access technologies.
Access BPL systems carry high speed data signals to neighborhoods from
a point where there is a connection to a telecommunications network.
The point of network connection may be at a power substation or at an
intermediate point between a substation and network terminations,
depending on the network topology. Within a residential neighborhood,
some system implementations complete the connection between the medium
voltage lines and subscriber homes or businesses by using wireless
Other implementations employ a coupler or bridge circuit module at the
low-voltage distribution transformers to transfer the Access BPL
signals across (thereby bypassing) these devices.
In such systems, the BPL signals are brought into homes or businesses
over the exterior power supply cable from the coupler/bridges, either
directly, or via Access BPL adaptor modules.
Typically, the medium voltage lines are carried overhead on
transmission poles or tower mountings; however, in a large number of
locations, and in newer subdivisions and neighborhoods, these lines
are enclosed in underground conduits and the distribution transformers
are mounted above ground on a pad, inside a metal housing.
interference concern regarding BPL operation arises from the fact that
electric power lines are not shielded and therefore portions of any RF
energy they may carry can be radiated. While the power distribution
management devices, such as transformers, and sometimes underground
placement of lines that are characteristic of many electric utility
systems tend to substantially diminish the effectiveness of these
systems as radiators of RF energy, the potential for significant
radiation of RF energy from utility systems that carry RF signals
nonetheless remains. This “signal leakage,” which has for years made
possible the reception of carrier current radio stations at colleges,
universities and other institutions without a connection to the power
line, can become harmful interference if not carefully managed. That
is, radio systems using the same frequency bands as those on which
local Access BPL signals are transmitted could possibly receive
harmful interference from such signal leakage if adequate safeguards
are not in place.
Access BPL systems that are currently deployed [in
USA] operate in the range from 2 MHz to 50 MHz, with very low-power
signals that are spread over a broad range of frequencies. These
frequencies are also used by licensed radio services that must be
protected from harmful interference."