As published by Network Magazone-
India http://www.networkmagazineindia.com
There is now a whole new way to connect to the Internet and to network computers
in a LAN, by using the world's largest existing network-the power grid.
by oo Gin LeePLC uses the existing electrical wirings hidden in the walls
of homes and buildings, users can do away with messy cables and do not need
to open floorboards, hack walls and break ceilings to run the wires Powerline
communications (PLC) may soon be a viable alternative to DSL and cable for
last mile connectivity, and as power grids already cover 95 percent of the
world, it also offers better penetration. PLC makes use of existing low-voltage
electrical cables to transmit data and voice signals, and allows services
such as LAN, broadband Internet access, telephony, and fax. For utility
suppliers, PLC opens a whole new revenue stream for them which they can
deploy quickly. For service providers buying wholesale services from utility
companies, PLC also offer various benefits, including the speed and cost
of deployment and the ability to break the telco monopoly on last-mile access
in many countries.
Powerline around the world
There are currently two main technology providers Switzerland's Ascom and
Israel's Main.net PLC. Between them, they have helped to start PLC services
in many countries including Germany, Sweden, Singapore and even the remote
ski-resort cities in the Austrian Tyrolean mountains. In Singapore, the
incumbent utility company Singapore Power (SP) started technical trials
last November, using a test-site at the Singapore Polytechnic. Initial speeds
of 800 Kbps and later 2.25 Mbps were achieved. Then in April this year,
SP announced it was working with two local service providers Pacific Internet
and Little Green Apples (LGA) to roll-out commercial trials of the Internet
access via power-socket technology which could now reach 45 Mbps. The "test-sites"
involved about 500 users from a school, commercial buildings and homes.
Commercial services are expected to be launched late 2002 or early 2003.
Technology pros and cons
Current PLC technology has reached a maximum speed of 45 Mbps. This is divided
into a maximum 27 Mbps for downstream speeds and 18 Mbps for upstream speeds.
In Singapore, PLC will have the highest access speeds, compared to ADSL
clocking in at 512 Kbps and cable at 1.5 Mbps. However, as PLC is a point-to-multipoint
technology, the 45 Mbps needs to be shared by users in a building or within
an area. Basically, 45 Mbps is the bandwidth for one substation. PLC's significantly
higher upload and download speeds make it suitable for a variety of two-way
applications like peer-to-peer networking, file-sharing over the Internet,
and interactive distributed online services like games and Web-cams. Because
PLC uses the existing electrical wirings hidden in the walls of homes and
buildings, users can do away with messy cables and do not need to open floorboards,
hack walls and break ceilings to run the wires. PLC also enables indoor
networking for PCs and printers, plus shared Internet access between PCs
in an office or home. In addition, PLC boasts a superior distance of 300m
(without using repeaters) compared to 100m for standard Fast-Ethernet and
about 50m for 802.11b wireless connections. However, there are potential
security issues because a single power line from the utility company goes
to multiple homes and office buildings. This means that hackers can "listen
in" on the shared bandwidth. But according to RWE Powerline, a service
provider that has rolled out commercial PLC services in Germany, security
is not an issue. Its website says that PLC is harder to tap than GSM mobile
phones. Viability to utility company
For utility companies, PLC opens up a new revenue stream at minimal or moderate
risk. Explaining SP's decision to use PLC technology, its President Rear-Admiral
(Ret) Kwek Siew Jin, said: "PLC involves expanding the use of existing
energy infrastructure for transferring information. Since SP is already
transporting electricity through its networks, it is thus synergistic to
leverage on SP's core assets and spur the use of this technology."
For utility companies, there are three business models: The wholesale model
where the utility company provides the last-mile infrastructure to ISPs,
like what SP is doing
The data only model where the utility company acts as the ISP for data services
The full ISP model where the utility company acts as ISP for voice and data
services
According to a white paper by Ascom, the wholesale model offers a very safe
investment with an expected ROI of between 5-10 percent. The second model
offers an attractive investment at a moderate risk, with ROI ranging between
10-15 percent. And the full ISP model offers a very attractive investment
with moderate risk, with the ROI at 15-20 percent.In Singapore, SP is using
the wholesale model, providing the back-end last-mile infrastructure access
while ISPs Pacific Internet and LGA interface with end-users. Viability
to service providers
For Pacific Internet, SP's entry into the Internet access business means
that it can be less reliant on rivals SingTel and StarHub, both of which
own their own last-mile infrastructure by way of telephone lines for the
former and telephone lines and cable for the latter. Sui Wee Chong, Senior
VP, consumer and corporate (sales & marketing), Pacific Internet Singapore,
said that this will allow the company to be a broadband provider of choice
to customers, and to recommend the best solution that suits their needs.
Yew Hock Meng, Chief Marketing Officer of LGA, said that PLC lets his company
deploy Internet access solutions faster and cheaper to LGA's customers.
"In the past, you needed technicians to do wiring and connections.
Now we can just deliver pre-configured PLC modems and users can just plug-and-play,"
said Yew. He added that cost-savings come from taking away the need for
pulling messy Ethernet wires, plus saving the cost of patching telephone
lines every time a new household or office apply for Internet access. But
he does not expect PLC to replace the other existing technologies like DSL
and Wi-Fi as they are complementary. Powerline networking
PLC technologies can also be used to network computers for file and printer
sharing, or sharing cable or ADSL Internet access among computers in a Powerline
network much like an Ethernet LAN. All the users need is a sandwich-sized
adaptor for every PC that needs to be connected. One end of the adaptor
goes into the Ethernet or USB port of the PC while the other plugs into
the mains socket. To share Internet access, a powerline bridge needs to
be connected to the router. One end of the bridge is connected via Cat-5
cable into the uplink port of the router, while the other end goes into
the power socket. Several vendors have released or are soon releasing these
powerline networking products, including LinkSys, Gigafast, SMC and NetGear.
LinkSys will also be releasing a powerline router (which has Ethernet ports)
soon, which removes the need to connect a second device (the powerline bridge)
to the router. According to LinkSys, the cost of the powerline adaptors
(Ethernet or USB) is about US$180 while the upcoming router will be about
US$200.
Originally published by:http://www.networkmagazineindia.com
on December 9, 2003
