Carlson Wireless USA revision 1.05 Page 14
Carlson Wireless USA revision 1.05 Page 7
(2) Other users of the 2.400 to 2.483 GHz ISM band.
The ISM or Industrial, Scientific, and Medical band, is shared with many other
type of services. Fortunately most of the users are located in urban areas,
leaving sharing concerns down to consumer microwave ovens and other
spread spectrum rural telephone users. The I-WLL-15 system has divided the
ISM band into 8 sub-bands or channels. One channel is used for system ad-
ministration with the system then randomly selecting 1 of the 7 remaining
channels for operation.
The functionality of the i-WLL–15 system de-
pends on the existing and forecasted spectrum usage in the radio
path.
Due to the characteristics of the spread spectrum radio, the ITU
(International Telecommunication Union) was able to coordinate this band
globally for unlicensed use. This means that any user has to accept all other
users in this band, interfering or not.
(3) Availability of telephone service and power.
The I-WLL-15 system consists of two units. One is designed to connect to
the standard phone lines provided by a local telephone company office (FXO
side) and the other connects to the telephone instruments such as; DTMF
(touch tone) telephones, fax machines, and computer modems (FXS side) via
individually twisted pair phone/data cable. The system is very flexible about
voltage requirements. 12 to 55 Volts DC with the current being inversely pro-
portional to the voltage, the power use being approximately 3 Watts for the
FXO side, in any state, and 3 to 6 Watts for the FXS side depending on us-
age state. We recommend over-sizing the supply by 1.5 to 2 times. Depend-
ing on the length, most installations can use 4 twisted pair, #22 AWG feed
cable. This will drop about 1 volt per 100 feet of length. To allow for most any
voltage drop situation we recommend 24 volt, 500 mA power supplies.
Using
non-twisted IW or Quad phone wiring will result in cross-talk between
lines.
(4) Mounting structure.
Warning! Use extreme caution to avoid contact with any high voltage
power lines when constructing antenna structures!
The enclosure is designed to mount on a steel vertical pipe, commonly known
in North America as 1 to 2 inch pipe ( 2.5 to 5 cm ), with an actual outside
diameter of 1.3 to 2.5 inches ( 3 to 6 cm ). This mast must not move signifi-
cantly in any anticipated wind and must be connected with a short copper #8
AWG wire to a copper clad ground rod driven at least 6 feet (2m) into moist
earth.
