What is Cablefree?
transmit high-speed digital data and television pictures
through the atmosphere over distances up to and exceeding
4000m. State-of-the art infrared technology makes this a
perfect alternative to traditional cable or radio systems,
with unprecedented performance and simplicity of use – There
is no compromise to signal quality, with freedom from
interference or radio licensing regulations.
When should I
Any occasion when you need outdoor
point-to-point connection of Computer or Data networks,
Telephone exchanges or video images for Broadcast Television
or CCTV security, over distances of up to 4000m. Typical usage
is when other options such as digging trenches for copper or
fibre optic cables, leased lines, microwave or radio links are
ruled out on grounds of cost, timescale or planning/licensing
systems are quick to set up,
reliable, safe and future-proof with low running costs.
Installations can be temporary, mounted on tripods, or
permanent such as between buildings.
bandwidth and signal quality?
Optical technology used in
systems offer the huge bandwidth
associated with that of fibre-optic cable, without the need
for a physical link - virtually any two points separated by a
clear line-of-sight path of up to 1 kilometre can be
systems can transmit high-speed
digital data up to 1.5Gbps, allowing connection of Gigabit
Ethernet, ATM-155 and 270Mbps SMPTE Serial Digital signals
without the ‘bottleneck’ associated with radio, leased-line,
cable-modem or WAN connection. Analogue signals such as
composite video can also be transmitted with excellent
fidelity. The bandwidth limitations, signal distortion and
interference problems with radio and microwave systems do not
convenient and easy to use?
Users have a choice of
systems to suit the application – for
short ‘hops’ of around 1km, the
Cablefree 622 and Gigabit
are high performance solutions.
For longer-range links up to 4km, the
gives unmatched performance from
a unit which are compact and cost-effective. All
systems can be configured with
interfaces for a vast range of data or video applications.
On-site upgrades mean that a network
connection is ‘future-proof’ – if you need to switch from
10Mbps to 100Mbps Ethernet, single to multiple-channel CCTV or
from analogue to digital video, your
can be reconfigured by simple
change of interchangeable plug-in modules.
systems are easy to set up for
either permanent or temporary use, with a range of alignment
aids to ensure quick network connection. On-screen menus,
optional remote configuration and monitoring allow system
status, environmental conditions and out-of-tolerance warnings
to be detected.
Can I use
Cablefree as a temporary link?
are quick to set up, suited to temporary or permanent
deployment, and can be run from both mains and low voltage
power supplies or battery packs. Typical lead-acid battery
sources can give up to 24 hours continuous operation. There
are no licensing issues or risk of interference.
Cablefree solve my Data Networking problems?
links are entirely transparent to
network traffic, allowing extension of existing networks or
interconnection of legacy networks in hub-to-hub or
hub-to-workstation configuration. A range of industry-standard
interfaces allows Cablefree
to connect to Ethernet
(10 and 100Mbps, Twisted-pair and Fibre-optic), Token Ring (4
or 16Mbps), FDDI (Twisted-pair or Fibre-optic), ATM-155
(Twisted-pair or Fibre-optic), Fibre-channel, ESCON and many
others. New Cablefree
multiple 2Mbps E1/G703 channels to be carried alongside
network traffic, giving the ultimate in building-to-building
connectivity for PABX and computer connection.
telephone extensions in a nearby building. Can Cablefree
An absolutely classic scenario –
companies on industrial or science parks frequently need to
extend into nearby units, or need temporary use of another
building. Services such as BT MegaStream are expensive to
install and then there are high line-rental costs – and the
delay in connection may be unacceptable. With
you can have a 2Mbps E1/G703 link for
half the cost* – and installation typically takes
less than 3 hours. You can connect to any industry-standard
telephony multiplexer or PABX.
also offers systems with multiple 2Mbps
channels over a single link.
For a 2Mbps, 200m link in Surrey, 1997, BT quoted £12,000 for
installation and around £2,000 annual fee.
the ‘Last Mile’ problem in the Cable industry?
The ‘Last Mile’ problem is where a
telecomms or cable company has to provide high-speed links
from subscribers or potential customers sites to the carrier’s
backbone – such as an SDH network, which may be laid under the
road nearby. Cable modems, ISDN (64 or 128kbps) or DSL
technologies are solutions currently under criticism for
limited bandwidth or concerns over reliability, and local
authorities place limitations on the frequency at which a
public right-of-way may be disrupted for digging – cost and
timescale concerns are issues also for copper links.
is an ideal ‘Last Mile’ solution,
connecting to the backbone at data rates from 2 to 155Mbps and
beyond – removing the twisted-pair ‘bottleneck’.
suitable for Outside Broadcast or CCTV use?
systems offer exceptional performance in
picture quality for both analogue and digital pictures.
Broadcast formats include analogue composite video (over 67dB
SNR, frequency response flat to over 9MHz and impeccable
specifications for signal fidelity) and SMPTE 259 Serial
Digital (143, 177, 270 and 360Mbps). For CCTV use
offers interfaces for single and
multi-channel composite video with optional audio and
telemetry channels (RS232, RS422 and others). There are no
interference or licensing issues, and no restrictions near
airports or in flammable environments.
technology reliable? Or safe?
Yes, and yes! Optical systems only
suffer in performance when the atmosphere is visibly obscured
– such as in fog. However,
is designed to cope with all normal variation in weather
conditions such as rain, fog, snow, smog and thermal shimmer,
and a large built-in ‘fade’ margin ensures uninterrupted data
transmission with superior performance over comparable
technologies*. The use of divergent beam technology
overcomes potential problems of vibration and building
movement, ensuring correct alignment at all times.
With regard to safety,
systems are certified to meet the stringent eye-safety
requirements of IEC825 and BS EN60825, which make them
completely safe to use. A range of safety features ensures
that the systems remain so even in fault conditions. The units
are powered from 12V d.c. using batteries or external mains
power supplies, thus eliminating electrical hazards associated
with mains voltages.
For typical installations,
attains availability between 99.997% and 99.7% depending on
distance and location, and bit-error-rate of between 10-12
and 10-9 even at high data rates. These figures
compare well with microwave or even hard-wired systems.
How do I find
out more about Cablefree?
would be delighted to assist you by
providing more information about our systems and how the
technology can suit your application. In addition to the
examples given above,
is suited to a huge and growing
range of applications, and some exciting future developments.
systems can be supplied
configured for your application directly from our head office
in Surrey, U.K, or from a number of appointed resellers.
Contact us for quotation or shipment details.
For further information please