Power-over-Ethernet technology, unveiled at the CeBIT
show in Hanover last week, could simplify the design and
implementation of networks in most businesses, according to
industry experts.
The technology, which routes DC electrical power over Ethernet
cabling, will allow cheaper, more flexible deployment of devices
such as wireless Lan and voice-over-IP equipment.
Steve Broadhead, of network equipment testing company NSS, said,
"It simplifies the design of an office, alleviates the need for
endless mains sockets and enables networks to be installed in more
'awkward' environments.
"The obvious application is for wireless Lans - access points are
often located in ceilings. There are possible applications wherever
it is awkward to locate mains power." In addition, it allows
centralised detection of a company's devices, data and power
management.
Products were unveiled by 3Com and Foundry at CeBIT, but all major
network suppliers will be shipping equipment, despite IEEE standard
802.3af still being at "draft specification" stage.
According to Broadhead, adopters of power-over-Lan should not be
concerned that standards have not been ratified. "There is a lot of
support for this technology. I would not be afraid to invest in
advance."
Quocirca analyst Clive Longbottom said, "Because
power-over-Ethernet uses spare wires in thin Ethernet cabling, it
is probably not possible to go above 200W. Powering a desktop is
out of the question, but laptops will be possible in the near
future."
Power benefits
- Decreases installation costs for devices such as voice-over-IP
phones, wireless Lan access points or webcams
- Centrally controls the power supply, allowing functions such as
hard resets to be carried out remotely
- Allows 48V DC to be transmitted over spare data pairs in 10/100
Ethernet cabling, sufficient for devices up to
15.4W.